Disclosure to Promote the Right To Information

Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

इंटरनेट मानक

“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru

“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 2933 (1975): Enamel exterior (a) undercoating, (b)finishing [CHD 20: Paints, Varnishes and Related Products]

IS : 2933 - 1975 (Reaffirmed 2009)

Indian Standard SPECIFICATION FOR ENAMEL, EXTERIOR,

(a) UNDERCOATING, (b) FINISHING

( First Revision )

Sixth Reprint MAY 2006 (Including Amendment No. 1 and 2)

UDC 666.29 : 667.637.2

© Copyright 1975

B U R E A U O F I N D I A N S T A N D A R D S MANAK BHAVAN. 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 4 June 1975

TO IS:2933-1975 SPECIFICATION FOR ENAMEL, EXTERIOR,

(a) UNDERCOATING, (b ) FINISHING

(First Revision)

Alterations

[Page 13, clause A-2.2(b) and (c) , line 1] -Subat i tu te 'No. 260 /320 ' for 'No . 220 /240 ' a t b o t h the p l a c e s .

[Page 13, clause A-2.2(c), l i n e 4] - S u b s t i t u t e '24 h o u r s ' for '48 hours .

(CDC 8 ) Printed at Dee Kay Printers, New Delhi, India

AMENDMENT NO. 2 APRIL 1982

AMENDMENT NO. 1 APRIL 1979 TO

IS:2933-1975 SPECIFICATION FOR ENAMEL, EXTERIOR, ( a ) UNDERCOATING, (b) FINISHING

(First Revision)

A l t e r a t i o n s

[Page 6, clause 4.1, col (1) to ( 4 ) , Colour Category No. 18] - S u b s t i t u t e t h e fo l lowing for the e x i s t i n g t e x t and renumber t h e subsequent co lour c a t e g o r i e s ' 19 t o 2 8 ' a s '20 t o 2 9 ' :

(1 )

18 19

(2) Primrose Light Buff

(3) 354 358

(4) Primrose Light Buff

[Page 8, clause 5 . 1 .4 ( a ) , line 1] - Subst i tute ' p i g n e n t s , e x t e n d e r s , i f p r e s e n t ' for ' p i g m e n t s ' .

[Page 8, clause 5 .1 .4 (b ) , line 1] - Subst i tute 'pigment i n c l u d i n g e x t e n d e r s , i f p r e s e n t ' far •pigment '

(Page 9, clause 5 . 2 . 2 , lines 4 and 5) - Subst i tute ' s h a l l comply wi th t h e requ i rements s p e c i f i e d in 5 . 2 . 2 . 1 and 5 . 2 . 5 . 2 ' for ' s h a l l not m a t e r i a l l y d i f f e r in performance as compared with t h e record of the f i lm of t h e r e g i s t e r e d sample more than the l i m i t s s p e c i f i e d i n 5 . 2 . 2 . 1 and 5 . 2 . 2 . 2 ' .

(Page 9, clause 5.2.2.2, line 3) - Subst i tute 'more than s l i g h t l y ' for ' a p p r e c i a b l y ' .

[Page 10, Table 1, col 3 and 4, against i t e m ( i i ) ] S u b s t i t u t e t he fo l lowing for t h e e x i s t i n g m a t t e r :

'Smooth and uniform and s u i t a b l e for b rush ing wi thout a p p r e c i a b l e drag on t h e b r u s h '

1

( Page 11, clause 5.5 ) - Delete. (Page 12, clause 8.1, line 4) - Substitute

'5.1.5 and 5.3' for '5.l.5, 5.3 and 5 .5 ' .

Addenda

(Page 8, clause 5 .1 .1 , para 1) - Add the fol lowing new mat t e r a t t he end:

'However, when t h e bu lk supply is of t h e same shade a s t h a t o f the r e g i s t e r e d sample t h e d e v i a t i o n s h a l l no t be more than ± 15 p e r c e n t by mass.

(Page 8, clauee 5 .1 .1 , para 2) - Add the fol lowing new ma t t e r a t t h e end:

'Any s i l i c i o u s o r ex t raneous ma t t e r p r e s e n t to t h e e x t e n t of 0 .5 p e r c e n t by mass on p a i n t , i f a b s e n t in bulk supply s h a l l no t be the cause fo r r e j e c t i o n .

[Page 10, Table 1, item(iii), col ( l ) to ( 5 ) ] - Add t h e fo l lowing new ma t t e r a f t e r i t e m ( i i i ) and renumber the subsequent i tems ' ( i v ) to (x) ' a s ' ( v ) t o ( x i ) ' r e s p e c t i v e l y :

(1)

iv)

(2) Wet o p a c i t y

(3) ( 4 )

Between —10 pe rcen t and +20 p e r c e n t of r e g i s t e r e d sample

(5) 10

(CDC 8)

2

Printed at Dee Kay Printers, New Delhi, India

IS : 2933 - 1975

Indian Standard SPECIFICATION FOR ENAMEL, EXTERIOR,

(a) UNDERCOATING, (b) FINISHING

( First Revision ) Paints and Allied Products Sectional Committee, C D C 8

Chairman

SHRI T . K . S . M A N I

Members

Representing

Addisons Paintd and Chemicals Ltd, Madras

SHRI M . B . SATYANARAYANA ( Alternate to Shri T. K. S. Mani )

SHRI B A L J I T SINGH Bhagsons Paint Industries ( India ), New Delhi SHRI H A R D I P SINGH ( Alternate )

DR A. S. BHADURI SHRI K . C . SEAL ( Alternate )

DR P . K . BHANDARI SHRI N . S . BHARATIA

SHRI S. H . D E S A I ( Alternate ) SHRI C . J . BHUMKAR SHRI A. K. CAPRIHAN

SHRI J . K. ANAND ( Altemate ) SHRI K . N . CHOWDHARI

National Test House, Calcutta

Shalimar Paints Ltd, Calcutta Blundell Eomite Paints Ltd, Bombay

Asian Paints ( India ) Ltd, Bombay Indian Aluminium Co Ltd, Calcutta

Ministry of Defence ( DGI ) SHRI S. K. MAITRA ( Alternate )

SHRI N . G . S . IYER

J O I N T DIRECTOR ( M & C )

Directorate General of Supplies & Disposals, New Delhi

Railway Board ( Ministry of Railways ) SHRI A. RAMAMURTHY ( Alternate )

SHRI R . K . MARPHATIA Goodlass Nerolac Paints Ltd, Bombay SHRI N . R . KOLWALKAR ( Alternate )

SHRI M . N . R A O SHRI B . V. DALAL ( Altemate )

DR R. J . R A T H I

SHRI K . L . R A T H I ( Alternate ) SHRI O. P . RATRA SHRI R . K . ROKADE

Indian Paint Association, Calcutta

Raw Materials for Paint Industry Sectional Committee, CDC 50, ISI

National Buildings Organization, New Delhi The Premier Automobiles Ltd, Bombay

SHRI P. K . D E S H P A N D E ( Alternate ) S H R I P . SATYANARAYANAN Development Commissioner, Small Scale Industries,

New Delhi

( Continued on page 2 )

© Copyright 1975

BUREAU OF INDIAN STANDARDS This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 2933 - 1975

( Continued from 1 )

Members SCRNNTIFIC ADVISER TO THE CHINY OF THE NAVAL STAFF S H R I K . N . R . SHARMA

SHRI KULTAR SINGH ( Alternate ) DR S. M. SINGH DR M. A. SIVASAMBAN SUPERINTNNDING SURVEYOR OF

W O R K S ( I )

Representing

Naval Headquarters

Directorate General of Technical Development New Delhi

Central Building Research Institute ( CSIR ), Roorkee Regional Research Laboratory ( GSIR ), Hyderabad Gentral Public Works Department, New Delhi

SURVEYOR OF W O R K S ( I ) ( Alternate ) SHRI Y. S. SWAMY The Alkali & Chemical Corporation of India Ltd,

Calcutta SHRI S. BHATTACHARYYA ( Alternate )

DR G. M. SAXENA, Director ( Chem )

Director General, ISI ( Ex-officio Member )

Secretary

S H R I R . K . S I N G H

Assistant Director ( Chem ), ISI

Panel for RMP's, Enamels and Adjuncts, CDC 8 : 6 : 6

Convener

DR P. K. BHANDARI

Members

SHRI S. K. ASTHANA CHEMIST & METALLURGIST-II SHRI T . K . S . M A N I S H R I M . N . R A O

Shalimar Paints Ltd, Calcutta

Ministry of Defence ( DGI ) Railway Board ( Ministry or Railways ) Addisons Paints and Chemicals Ltd, Madras Indian Paint Association. Calcutta

DR A. B. GERSAPPE ( Alternate )

Ad hoc Panel for Review of IS: 2932 and IS : 2933, CDC 8 : 6 : 13 Convener

SHHI M . N . R A O

Member

SBHI B . B . A J M A N I DR P. K. BHANDARI SHRI K . C . S E A L SHRI Y . S . SWAMY

Indian Paint Association, Calcutta

Railway Board ( Ministry of Railways ) Shalimar Paints Ltd, Calcutta National Test House, Calcutta The Alkali & Chemical Corporation of India Ltd

Calcutta

2

IS : 2933 - 1975

Indian Standard SPECIFICATION FOR ENAMEL, EXTERIOR,

(a) UNDERCOATING, (b) FINISHING

( First Revision )

0. F O R E W O R D 0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 25 February 1975, after the draft finalized by the Paints and Allied Products Sectional Commit tee had been approved by the Chemical Division Council.

0.2 This standard was first published in 1964 amalgamat ing IS : 522-1954* and IS : 523-1954†. This revision has been prepared based on the recommendations of an Ad hoc Panel specifically constituted by the concerned technical committee responsible for formulation of this standard.

0.3 In this revision the title of the standard has been simplified and the composition clause has been elaborated. In order to overcome the time consuming process of testing and approval of the samples of the material of each of the 99 shades in IS : 5-1961‡, 28 colour categories have been specified, which is expected to reduce the time and work of all concerned and give better service to the consumers. The mass in kg per 10 litres of the material has been suitably modified keeping in view the technological development in the field during the last decade. Amendment No. 1 of March 1970 issued to this s tandard has also been incorporated.

0.3.1 In the composition clause limits of variations for pigments and solid vehicles, extenders, phthalic anhydride content, etc, in the bulk supply to that of the registered sample have been specified keeping in view the shade variations in the same colour category and the performance of the material.

0.4 The concerned technical committee intends to prescribe gloss-retention values at 45° exposure of all shades after 3, 6, 9 and 12 months of outdoor exposure and colourwise requirements for wet opacity based on data to be collected in due course. Black colour has, however, been found to show

*Specification for enamel, brushing, exterior, Type 2, (1) undercoating, (2) finishing, colour as required ( withdrawn ).

†Specification for enamel, spraying, exterior, Type 2, (1) undercoating, (2) finishing, polour as required ( withdrawn ).

‡Colours for ready mixed paints ( second revision ).

3

IS : 2933 - 1975

better retention of gloss and presently a minimum gloss-retention assessment value of 50 percent of the original has been found for the black. Based on da ta collected for all other shades the method of test for durabil i ty would be modified in line with the durabili ty clause of IS : 2932-1974* in due course.

0.5 This s tandard contains clauses 3.1 and 5.5 which call for agreement between the purchaser and the supplier.

0.6 For satisfactory results, it is desirable that the primer, undercoating and the finishing enamels are obtained from the same manufacturer . For purposes of testing, the primer, undercoating and the finishing enamels shall be from the same source.

0.7 For the purpose of deciding whether a part icular requirement of this s tandard is complied with, the final value, observed or calculated, express­ing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960†. T h e number of significant places retained in the rounded off value should be the same as that of the specified value in this s tandard.

1. SCOPE

1.1 This s tandard prescribes requirements and methods of sampling and test for the material commercially known as enamel, exterior: (a) undercoating (b) finishing. The material is used in painting systems for protection and decoration.

2. T E R M I N O L O G Y

2.0 For the purpose of this s tandard, the definitions given in IS : 1303-1963‡, 2 of IS : 101-1964§ and the one given below shall apply.

2.1 R e g i s t e r e d S a m p l e — Sample supplied in advance by a prospective supplier and registered by the approved testing authorities after testing it to all the requirements of this s tandard. A complete record of its performance shall be kept in respect of all tests.

3. CLASSES

3.1 T h e material shall be supplied in brushing consistency but shall be suitable for application by brushing and spraying after thinning with a suitable thinner as agreed to between the purchaser and the supplier.

*Specification for enamel, synthetic, exterior, (a) undercoating, (b) finishing ( first revision ).

†Rules for rounding off numerical values ( revised ). ‡Glossary of terms relating to paints ( revised ). §Methods of test for ready mixed paints and enamels ( second revision ).

4

IS : 2933 - 1975

4. COLOUR CATEGORIES 4.1 For the purpose of registration of the samples of the material, the following colour categories shall be employed:

Colour Category

No. (1)

1 2 3 4

5

6

7

8 9

10

11

12

13

i) ii)

iii)

i) ii)

iii)

i) ii)

iii)

i) ii)

i) ii)

i) ii)

iii) i)

ii) iii)

i) ii)

iii) iv) v)

vi) vii)

Colour Shade

(2) White Black Dark Violet Sky Blue Turquoise Blue Oriental Blue Eau-de-Nil Opaline Green Apple Green Peacock Blue Azure Blue Traffic Blue

Oxford Blue Navy Blue

Aircraft Blue French Blue

Sea Green Verdigris Green

Sage Green Light Olive Green Aircraft Grey Green Grass Green Traffic Green India Green Brilliant Green Light Brunswick Green Middle Brunswick Green Deep Brunswick Green Lincoln Green Cypress Green Forest Green

Indian Standard Colour No. (as

per IS: 5-1961*) (3) — —

796 101 102 174 216 275 281 103 " 104 169

105 106

108 166

217 ' 280

219 278 283 218 ' 267 284 221 225 226 227 276 277 282

Shade Recommended for Registration

of Sample

(4) White Black Dark Violet

Turquoise Blue

Apple Green

Traffic Blue

Oxford Blue

Aircraft Blue French Blue

Sea Green

Sage Green

Traffic Green

Middle Brunswick Green

*Colours for ready mixed patnts ( second revision ).

5

IS : 2933 - 1975

Colour Category

No.

(1)

14

15

16

17

18

19

20

i) ii)

iii) iv) v)

vi)

i) ii)

i) ii)

iii) iv) v)

vi) vii)

viii) ix) x)

xi) xii)

xiii)

i) ii)

i) ii)

iii)

i) ii)

iii) iv) v)

vi)

Colour Shade

(2)

Olive Green Light Bronze Green Middle Bronze Green Deep Bronze Green Steel Furniture Green Olive Drab

Canary Yellow

Lemon Golden Yellow

Pale Cream Deep Cream Light Stone Portland Stone Vellum Light Straw Light Biscuit Champagne Sunshine Beige Jasmine Yellow Light Salmon Pink Salmon Pink

Primrose Light Buff

Middle Buff Deep Buff Middle Stone

Dark Stone Light Brown Middle Brown Golden Brown Imperial Brown Leaf Brown

Indian Standard Colour No. ( as

per IS : 5-1961* )

(3)

2 2 0 ' 222 223 224 279 298

309

355 356

352 353 361 364 365 384 385 386 387 388 397 442 443

354 358

359 360 362

363 410 411 414 415 489

Shade Recommended for Registration

of Sample

(4)

Olive Green

Canary Yellow

Golden Yellow

Pale Cream or Deep Cream

Light Buff

Deep Buff

Light Brown

*Colours for ready mixed paints ( second revision ).

6

IS : 2933 - 1975

Colour

(1)

21

22 23

24 25

26 27

28

i) ii) iii) iv)

v) vi)

vii) viii) ix) x)

xi)

i) ii)

iii) iv) v)

i) ii) iii) iv)

i) ii)

iii) IV)

V)

vi) vii) viii) ix)

i) ii)

iii) iv) V)

Colour Shade

(2)

Dark Brown Nut Brown Orange Brown Venitian Red Red Oxide Deep Indian Red Light Purple Brown Chocolate Gulf Red Beech Brown Service Brown Terra Cotta Fire Red Signal Red Post Office Red Crimson International Orange Maroon Traffic Yellow Light Orange Traffic Red Deep Orange India Saffron Silver Grey Quaker Grey French Grey Light Grey Dark Admiralty Grey Smoke Grey Aircraft Grey Dove Grey Light Admiralty Grey RAF Blue Grey Slate Lead Middle Graphite Dark Blue Grey

Indian Standard Colour No. ( as

per IS : 5-1961* )

(3)

412 413 439 445 446 448 449 451 473 490 4 9 9 . 444 536 ' 537 538 540 592 541 368 557 570 591 574 628 629 630 631 632 692 693 694 697 633 634 635 671 695

Shade Recommended for Rigistration

of Sample

(4)

Gulf Red

Terra Cotta

Post Office Red or Signal Red

Maroon

Light Orange

India Saffiron

Light Grey or Aircraft Grey

RAF Blue Grey

*Colours for ready mixed paints ( second revision ).

7

IS : 2933 - 1975

5. R E Q U I R E M E N T S

5.1 C o m p o s i t i o n — T h e material shall be of such a composition as to satisfy the requirements of this s tandard. The compositions of the pigment and the vehicle of the bulk supply shall be similar to those of the registered sample within the permissible limits allowed in this specification.

5.1.1 T h e quant i ty of major constituents of the pigment composition of the bulk supply and that of the registered sample shall not deviate by more than ± 25 percent by mass when the bulk supply is of different colour shade from that of the registered sample but in the same colour category.

T h e total extender in the composition of the bulk supply and that of the registered sample shall not deviate by more than ± 25 percent by mass even if the extender is not a major constituent in the registered sample.

NOTE — Any constituent of pigment showing 20 percent by mass and above of the total pigment composition shall be considered as a major constituent of the pigment.

5.1.2 When no extender is present in the pigment of the registered sample, not more than 5 percent by mass of silicious/inert mat ter of the total pigment content in the material shall be allowed in the bulk supply.

5.1.3 In undcrcoatings the sum total of genuine pigments shall not deviate by more than ± 25 percent by mass, between the registered sample and the bulk supply when the bulk supply is of different colour shade than that of the registered sample but in the same colour category. However, when the bulk supply is of the same shade as that of the registered sample, the deviation shall not be more than ± 15 percent by mass.

5.1.4 When the bulk supply is of the same shade as that of the registered sample, the permissible limits allowed shall be as specified below:

a) T h e total non-volatile matter , which includes pigments and vehicle solids, shall not deviate by more than ± 10 percent by mass from the recorded da ta of the registered sample. This applies to both undercoatings and finishing enamels.

b) T h e total pigment content of the material shall not deviate by more than ± 15 percent by mass from that of the registered sample. This applies to both undercoatings and finishings.

5.1.5 T h e phthalic anhydr ide content of the non-volatile vehicle in the bulk supply shall not deviate by more than ± 15 percent from tha t of ???

8

IS : 2933 - 1975

registered sample, when estimated by the method prescribed in 15.6 of IS : 354 ( Part II )-1971*.

5.2 D u r a b i l i t y

5.2.1 Registered Sample

5.2.1.1 When prepared and tested as prescribed under A-3 up to a period of 12 months preferably at National Test House, Calcutta, a film prepared from the sample for registration of the material shall satisfy the requirements of the tests.

5.2.1.2 A film of the sample for registration shall be prepared and tested as prescribed under A-4 , in an accelerated weathering apparatus , and examined every third day for a period of 15 days and a complete record of its performance maintained.

NOTE — AS a precaution against inadvertent accidents, it is recommended that the outdoor exposure test ( see A-3 ) and the accelerated weathering test ( see A-4 ) are carried out in duplicate.

5.2.2 Sample from Bulk Supply — A film of the enamel prepared from a representative sample from bulk supply as prescribed in A-2 and tested in the accelerated weathering appara tus ( see A-4 ) and examined every third day for a period of 15 days shall not materially differ in performance as compared with the record of the film of the registered sample more than the limits specified in 5.2.2.1 and 5.2.2.2.

5.2.2.1 Gloss ( specular 45° ) retention of bulk supply shall be within ± 10 units of that of the registered sample.

N O T E — At any time during the wcather-o-meter test, the percentage value of gloss ( specular 45° ) retention of the bulk supply sample shall not vary by more than ± 10 units from the recorded data of the registered sample; for example, when the registered sample shouted 70 percent gloss retention at any particular stage of weather-o-meter test, the bulk supply sample shall show gloss retention of 60 percent to 80 percent at the corresponding stage of testing.

5.2.2.2 The results of observation on characteristics of the colour, checking, cracking, chalking, spotting, etc, of the bulk supply sample shall not be appreciably different from the recorded data of the registered sample.

5.3 T h e minimum mass in kg/10 litres of the material when tested in accordance with 25 of I S : 101-1964† shall be 12.0 and 8.5 for under-coating and finishing respectively. It shall be, however, within ± 3 percent when the shade is the same as the registered sample and ± 5 percent when the shade is different from the registered sample but within the same shade category. In no case, however, the mass per 10 litres shall be less than the stipulated minimum as mentioned above.

*Methods of sampling and test for resins: Part II Synthetic resins. †Methods of test for ready mixed paints and enamels ( second revision ).

9

IS : 2933 - 1975

5.4 The material shall also comply with the requirements given in Table 1.

TABLE 1 REQUIREMENTS FOR ENAMEL, EXTERIOR, (a) UNDERCOATING (b) FITNESHING

SL No

(1)

i)

ii)

iii)

iv)

v)

vi)

vii)

viii)

ix)

x)

CHARACTERISTIC

(2)

Drying time, Max:

a) Surface dry b) Hard dry c) Tack free

Consistenc

Finish

Colour

Water content (if water if suspected to be present), percent by mass Max

Scratch hardness after 48 hours air-drying

Flexibility and adhesion

Stripping test after 96 hours air-drying

Flash point, °C, Min

Keeping properties, Mix

REQUIREMENT FOR ENAMEL

Undercoating

(3)

—

— 12 hours

—

Finishing

(4)

—

8 hours 18 hours 24 hours

METHOD OF TEST (REF TO CL NO.

IN IS : 101-1964*)

(5)

7.2 (Method I)

Smooth and uniform and suitable for brushing

Smooth and matt to egg-shell gloss

Approximate match to the finishing enamel

No such scratch bare metal

No visible damage or detachment of the film after 48 hours air-drying

Smooth and glossy

Close match to the s p e c i f i e d IS colour or to an agreed colour where IS colour is not specified

0.5

as to show the

No visible damage or detachment of the film after 96 hours air-drying

Scratches free from jagged edges

30

One year

30

One year

7.4

7.5

11

14

191

16

17

24

31

*Methods of test for ready mixed paints and enamels ( second revision ).

10

IS : 2933 - 1975

5.5 Optional Requirements — In addition, if agreed to between the purchaser and the supplier, the spreading capacity, spreading time and wet opacity shall be determined in accordance with relevant methods of test as given in I S : 101-1964*, and the results recorded on the sample offered for registration against this specification. In case of supplies offered against any approved sample to this specification, spreading capacity and wet opacity shall be minimum 90 percent of the approved sample and spreading time shall not deviate by more than ± 10 percent from that of the approved sample.

6. FACKING AND MARKING

6.1 Packing — Unless otherwise agreed to between the purchaser and the supplier, the paint shall be packed in metal containers conforming to IS : 1407-1968† and IS : 2552-1970‡.

6.2 Marking — Each container shall be marked with the following:

a) Name and class of the material; b) Name of the manufacturer and/or his recognized trade-mark,

if any; c) Volume of the material; d) Batch No. or lot No. in code or otherwise; and c) Month and year of manufacture.

6.2.1 The containers may also be marked with the ISI Certification Mark.

NOTE — The use of the ISI Certification Mark is governed by the provisions of the Indian Standards Institution ( Certification Marks ) Act and (he Rules and Regulations made thereunder. The ISI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by ISI and operated by the procucer. ISI marked products are also continuously checked by ISI for conformity to that standard as a further safeguard. Details of conditions under which a licence for the use of the ISI Certifica-tion Mark may be granted to munufacturers or processors, may be obtained from the Indian Standards Institution.

7. SAMPLING

7.1 Preparation of Test Samples

7.1.1 For Registration — The sample shall be submitted in three different containers each containing not less than 500 ml of the material.

*Methods of test for ready mixed paints and enamels ( second revision ). †Specificatioo for round paint time ( first revision ). ‡Specification for steel drums ( galvanized and ungalvanized ) ( first revision ).

11

IS : 2933 - 1975

7.1.1.1 As testing to the requirements of this standard covers a period of more than 12 months, the supplier is advised to submit samples for registration sufficiently in advance within the period from October to December of the year, so that outdoor exposure test can be started during the period stipulated in A-3.1.

7.1.2 Tender Sample — The supplier may dispense with sending a tender sample provided that he declares that the material for which the tender is given is of the same quality as the sample previously registered in his name.

7.1.3 Bulk Supply Sample — Representative samples of the material shall be drawn and treated as prescribed under 3 of IS : 101-1964*.

8. TEST METHODS

8.1 Tests shall be conducted according to the methods prescribed in IS : 101-1964*, IS : 354 ( Part II )-1971† and Appendix A to this standard. References to the relevant clauses of those standards arc given in col 5 of Table 1, 5.1.5, 5.3 and 5.5; and to Appendix A in 5.2 of this standard.

8.2 Quality of Reagents — Unless specified otherwise, pure chemicals and distilled water ( see IS : 1070-1960‡ ) shall be employed in tests.

NOTE — ' Pure chemicals ' shall mean chemicals that do not contain impurities which affect the results of analysis.

8.3 Comparison with the performance of the registered sample shall be carried out on the basis of the records maintained for the registered sample ( see 5.2.1 ).

8.4 For match against Indian Standard colours, IS:5-1961§ shall be used.

9. CRITERIA FOR CONFORMITY

9.1 A lot shall be declared conforming to the requirements of this standard if the test results of the composite sample satisfy the requirements prescribed in 5.

*Methods of test for ready mixed paints and enamels ( second revision ). †Methods of sampling and test for resins: Part II Synthetic resins. ‡Specification for water, distilled quality ( revised ). §Colours for ready mixed paints ( second revision ).

12

IS : 2933 - 1975

A P P E N D I X A ( Clause 5.2 )

TEST FOR DURABILITY

A-0. GENERAL

A-0.1 O u t l i n e of the M e t h o d — T h e durabil i ty of the material is determined by ascertaining actual behaviour of suitably prepared test panels in normal outdoor exposure test for a specified period and evaluat-ing the results of this exposure by a suitable method of rat ing for various characteristics of the enamel film. Apar t from this, the enamel is also evaluated by an accelerated weathering test wherein a prepared panel is subjected to controlled exposure of heat, light and water in an artificial weathering appara tus .

A-1. TEST PANELS

A-1.1 The panels shall be of mild steel plate, 1.6 mm thick and free from surface defects. Panels for the outdoor exposure test shall be 300 × 300 mm in size and for the accelerated weathering test 150 × 75 mm. T h e panels shall be cleaned as prescribed under 5.2.1 of IS : 101-1964* and the back and edges of the panels shall be protected with two coats of a suitable paint .

A-2. P R E P A R A T I O N OF TEST PANELS

A-2.1 In the p a i n t n g procedure outlined under A-2.2, the air-drying of the films shall be done at room temperature as defined under 2.9 of IS : 101-1964* and at a relative humidity of not more than 70 percent.

A-2.2 T h e surface of the test panels to be exposed shall be prepared as follows:

a) Apply one coat of ready mixed paint , red oxide-zinc chrome, pr iming ( conforming to IS : 2074-1962†) by appropr ia te method ( brushing/spraying ) and allow to air-dry for 24 hours.

b) R u b down lightly with waterproof emery paper No. 220/240 and apply by appropr ia te method ( brushing/spraying ) one coat of the undercoat ing enamel and allow to air-dry for 24 hours.

c) R u b down, wet with waterproof emery paper No. 220/240, wash and wipe off water , apply by appropr ia te method ( brushing/ spraying ) one coat of the finishing enamel when the surface is dry, and allow to air-dry for 48 hours.

*Methods of test for ready mixed paints and enamels ( second revision ). †Specification for ready mixed paint, red oxide-zinc chrome, priming.

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IS : 2933 - 1975

d) Rub down, wet with waterproof emery paper No. 320, wash and wipe off water, apply by appropriate method ( brushing/spraying ) a second coat of the finising enamel when the surface is dry, and allow to air-dry for 7 days before subjecting to exposure test.

A-3. NORMAL OUTDOOR EXPOSURE TEST

A-3.0 Subject the samples for registration and the tender sampled, if supplied, to normal outdoor exposure test in the manner described under A-3.1.

A-3.1 Expose in the open the test panels, prepared in the manner prescribed Hinder A-1 and A-2 in duplicate, in a vertical position facing south. Commence the sxposure not earlier than the. third week of January and not later than the first week of April.

A-3.1.1 Examine the condition of the exposed films at monthly intervals for gloss retention and at bi-monthly intervals for the other characteristics given below:

a) Colour, b) Checking and cracking, c) Chalking, and d) Spotting.

A-3.1.2 For the above examinations, wash the right-hand half of the surface of the two test panels by pouring water and then wiping with a soft cloth or chamois leather ( see I S : 1017-1966* ). Adequate time for cooling of the panels to room temperature shall be allowed prior to washing. Examine the same half of the test panels at each examination. As an aid in the examination, a magnifying glass may be used, but the evaluation shall be based on an assessment with the unaided eye. At the end of the stipulated period for durability test, examine the two halves of the test panels. The sample shall be considered satisfactory if the material surface underneath as well as condition of the film in both the halves, the one washed periodically as well as the one washed only for the final examination is satisfactory by the method of evaluation described under A-3.2. Stray film failure due to extraneous causes other than climatic shall be ignored.

A.3.2 Method of Rating — The film of an unexposed test panel shall be rated with the following basic values for the respective characteristics:

a) Possessing high gloss b) Possessing correct colour

25 25

*Specification for chamois leather ( first revision )

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IS : 2933 - 1975

c) Freedom from checking and J) Freedom from chalking c) Freedom from spotting

cracking 35 10 5

100

NOTE — The initial rating of film may be 100 or less according to the condition of gloss and colour, the rating for freedom from checking and cracking, chalking and spotting being always the maximum in the case of unexposed films.

A-3.3 Evaluation of Exposed Films — In recording the condition of exposed films at each examination, express the observed relative values of different characteristics in percentages of the basic value allotted to each characteristic under A-3.2. The allotment of performance value should be multiples of 10. For arriving at an assessment, multiply the basic value for each characteristic ( see A-3.2 ) by the percentage awarded for the performance in the test and divide the product so obtained by 100 to obtain the percentage award for the observed value of each characteristic. Take the sum total of these resulting values as the overall assessment.

A-3.3.1 The following table is intended to serve as an example for the assessment of an enamel film after exposure:

Characteristic

a) Possessing high gloss b) Possessing correct colour c) Freedom from checking

and cracking d) Freedom from chalking e) Freedom from spotting

Basic Value

percent

25 25 35

10 5

100

Performance Value

percent

50 60 60

20 80

Assessment Value

percent

12.5 15.0 21.0

2.0 4.0

54.5

NOTE — Other characteristics being found satisfactory, the sample shall not be rejected on the ground of gloss retention being lower than 25 percent, but the gloss retention figure shall be reported.

A-3.4 Results of Exposure — Reckon the period for the general breakdown of the exposed film from the date of commencement of exposure to the time when the overall assessment falls below 50 percent or when the performance value of any one characteristic falls below 25 percent of the basic value adopted for that characteristic. In the

15

IS : 2933 - 1975

example given under A-3.3.1, although the overall assessment 54.5 percent, yet the film is to be regarded as having generally broke down, because the performance value of chalking has fallen belc 25 percent of its basic value.

A-3.5 Protection Against Corrosion — After the exposure of the film discontinued, examine for corrosion of the metal surface of the pan underneath by removing film at 5 different places, one in the centre are one each at 4 different places near the 4 corners about 50 mm away from either edge. The paint film shall be removed by solvent type pai??? remover. When the film is softened by the paint remover, it shall removed by gently rubbing with cotton swab or waste jute taking care remove adhering film of primer and/or undercoating. After removal the film, the exposed metal shall be covered by thick mineral oil petroleum jelly. Localized corrosion and/or rust spots shall not constitue a cause of failure. To satisfy the requirements of this standard, to metal surface shall be otherwise free from corrosion.

A.4. ACCELERATED WEATHERING TEST

A-4.1 Accelerated Weathering Apparatus — An artificial wcatherin??? apparatus of the carbon arc type for uniform and controlled exposure the effects of heat, light and water.

A-4.2 Procedure — Samples for registration shall be tested in duplica??? in a suitable accelerated weathering apparatus ( see A-4.1 ) and sample drawn from bulk supply shall be tested in a similar manner. The te??? panels shall be prepared as described under A-2.2.

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