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है”ह”ह
IS 3708-4 (1985): Methods of Test for Natural Rubber Latex- Part : 4 Natural rubber latex concentrate - Determinationof alkalinity [PCD 13: Rubber and Rubber Products]
IS I 3708 ( Put" ) • 1985
Indian StandardMETHODS OF TEST FOR
NATURAL RUBBER LATEX
PART 4 DETERMINATION OF TOTAL ALKALINITY
NRL:7
( First Revision)
Rubber Sectional Committee, PCDe 14
cuv_SUBI LALIT MOHAlfJ.AJUfADAS
R,prl#tllmgCosmos India Rubber Worn Fvt Ltd, Eon, bay
y~
SHBr S. B. GAlfOULI Dunlop India Ltd, CalcuttaSHUI K. S. LooAlfATHAN ( All,""," )
M-wsSHBJ SATISH ABBAIIAX Padinjarekara ARencies Ltd, KoltayamSIIBI O . P. AGARWAL Transasia Carpets Ltd, Sikandrabad
Smn J. N. JIlA (Aluruu)SRJU A. K. B.umYOPADUAYAY Ministry of Defence (DGI)
SHRI '1/.BHATTAClIABYA (AlUnuIU)DB B. BAlQIlJ"IDI: Carbon and Chemicals India Ltd, CochinDB D. BAlfBBlJII! Escon Consultants Pvt Ltd, CalcuttaDR P. S. BHABGAVA Alkali and Chemical Corporation of India Ltd,
CalcuttaSRJU N . C. SAIIAJDAB ( AltnlUlU)
SHaI J. CBATTEBJJDI Andrew Yule & Co Ltd, CalcuttaSHaI A. K. BJawAS ( AltmuJU )
Dn D. K. DAB National Test House, CalcuttaSual A. GHOSH ( AllmtaU)
SIIBI P. B. G. DA8TJDAB Bata India Ltd, CalcuttaSJUll S. SABKAJl ( AltnIUIU)
SRJU S. L. GANDHI Ministry of Defence ( R&D)Smll H. C. hun ( AlIlr1f4t, )
SIIBI J. M. GAllO Directorate General of Technical Development,1New Delhi
( CGnlimud .. ,." 2 )
@ CAJ17ri,1tl lY85
INDIAN ST&"'IIDARDS INSTITUTION
This pub~~oD is prot~ed under the llIIiUm Cofgri,ht Ad (XIV of 1957) and~UCtlOD m whole or m part by lU?y ~eans ftcrpt with writteu permillion of thepublisber shall be dremed to be an mfringement of copyright under the Did Act.
IS I 3708 ( Part of ) • 1985
( Ctnltinrud ftam paz,1 )
M",,6ns IUlwmtilttSHRI A. GEORGE JOHN Madru Rubber Factory Ltd, MadruSHBI K. J. JOSEPH Plantation Corporation of Kerala Ltd, Kottayam
SRRI K. T. V ABGHDE (-fluntal6)SBBI G. R. KAVISHVAB Indian Rubber R~eneratingCo Ltd, Thane
SRRI P. S. VmAln ( AIl#rrt4U )Smu N. S. KHANNA. All India Rubber Industries Allociation, Bombay
SaRI R . R. PANDIT (-flUmat, )Smu K. N. KosBY M. M. Rubber Co Ltd, Madru
SRRI N. SUBllAIUNIAN( Allmeat,)SHRI P. K. MADRAVA MmfON Thirumbadi Rubber Co Ltd, MokkamSHRI L. K. M"THUR Modi Rubber Ltd, ModipuramSBRI D. W. McCRIRICX Associat ion of Planten of Kerala, Cochin
SHRt P. K. MENON ( Alln'ruIU )Smu P. K. MENON United Planters' A.sociation of Southern India,
CoonoorSHBIE.B.UNNI(Ah~,)
DB W . MILLN8 Indian Rubber Manufacturers Research Association,Thane
SHRI N. B. FtroADII: (AltmI4u)SBBI R. Ml1BLBBDBABAN NAIR Hindwtan Latex Ltd, BangaloreSBBI R. R . PANDIT Bayer ( India) Ltd, Bombay
SJlBI D. J . BUAKUCIlA ( -flumat, )SSAI S. A. PASHA Loudon Rubber Co ( India) Ltd, Madru
SHRI R. KRISHNAN ( All"""," )SUBI M. C. PAUL Arakkunnam Co-opentive Rubber Marketing
Society Ltd, ArakkunnamSBBI K. S. RADSAXBrBSNAN National Rubber Manufac:turers Ltd, Calcutta
SHRI R. P. MATBUB ( A1tmtaI.I )SSAI A. RAJAIIANI Automotive Tyre Manufac:turen' AIIociation, New
DelhiSBBI P. C. SOOUPTA ( Altmsau)
SBBI RUllmJ:R Sums State Trading Corporation of India Ltd, New DelhiSHRIO. P. ABOlU. ( Altlr""')
DR S. B. RATS Synthetics and CheInic:ala Ltd, BombaySHBI H . C. CBOPRA ( -flUrNIU )
SBBI S. V. SARIIA Travanc:ore Rubber at Tea Co Ltd, Trivandrum.SBBI C. S. KRtllBlfA8"~ ( Allmrllfl)
SBBI SmrlL I. SHAH lDdian Petrochemic:a1s CorporatioD Ltd, P. O. Petro-chemicals, Vadorlara
SSBI A. K. MALLIlt ( AlUrNIU )SBBI E. V. TUOMAS Rubber Research IIlltitute of India, Kottayam;'-
Rubber Board, KottayamDB M. G. KUJlARAlf( AlImt4fl1 )DR N. M. MUJIK\¥ ( AhmcafI II )
SHBI M. S. SA:Dl'fA, Director General, lSI (~M,..)Director ( P at C )
s~
Smn DILKIIP KUllA.AsDstant Director ( P&C ), lSI
(~.,.9)
IS 13708 ( Part 4) - 1915
Indian StandardMETHODS OF TEST FOR
NATURAL RUBBER LATEXPART 4 DETeRMINATION OF TOTAL ALKALINITY
NRL:7
( First Revision)
o. FOREWORD
0.1 This Indian Standard ( Part 4 ) ( First Revision) was adopted by.theIndian Standards Institution on 8 March 1985, after the draft finalizedby the Rubber Sectional Committee had been approved by the Petroleum.Coal and Related Products Division Council.
0.2 Test methods for rubber latex had been originally covered in thefollowing Indian Standards:
For ruJlural rubber l4UxIS : 3708 ( Part 1 )-1966·IS: 3708 { Part 2 )-1968t
For sip"" brda&ru rubber l4lexIS : 4511 ( Part 1 )-1967t
Since some of the test methods covered in the above standards werecommon, the concerned committee had decided some years ago to unityand publish a seperate series of methods of test which would be applicable to all types of latices-- natural as well as synthetic. Accordiosly.the following six test methoda had been covered under IS : 9316.
IS: 9316 Methods of test for rubber latex:
Part 1-1979 Determination of surface tensionPart 2-1979 Determination of viscosity
-Methocb oCtat for natural rubber latex : Part 1 Dry rubber content, .Iudp content.demity, total alkalinity, KOH-number, mec:banicalrtability, volatile fatty acid number,pH, total nitroaeu, total copper, total iron. total manganese and total ash.
tMetbocb of test for natural rubber latex. Part 2.tJolethods of te.ts for styreae-butadiene rubber ( SBR ) latices: Part 1 Dei_iDatioD
ofdry polymer, ,H, demity, reaidualatyrene, bound styrene and soap content.
s
IS : 3708 ( Part 4 ) • 1985
Part 3-1979 Determination of coagulum contentPart 4·1979 Determination of total solids contentPart 5-1979 Drawing of samplesPart 6·1982 Determination of pH
0.2.1 As a result of further rethinking on the subject, it has now beendecided to re-designate the test methods common to natural andsynthetic rubber latices as RL series; test methods for natural rubber latexas NRL series and test methods for styrene-butadiene rubber latex asSBRL series. Consequently, test methods for rubber latex have been rationalized into the following three series:
a) IS: 9316 Unified methods of test applicable to both natural andsynthetic rubber latices - RL series ;
b) IS: 3708 Methods of test applicable to natural rubber latex NRL series; and
c) IS: 4511 Methods of test applicable to styrene butadiene rubberlatex - SBRL series.
0.3 The existing Indian standards under IS : 3708 ( Parts 1 • and 2t ),IS : 4511 ( Part 1~ ) and IS: 9316 ( Parts 1 to 6) are being graduallyreplaced by separate standards under the above three series, designatedby the appropriate NRL, SBRL, or RL series, respectively.
0.3.1 The methods covered under NRL: 13, NRL : 14 and NRL : 15ofIS : 3708 ( Part I )-1966 which are also under revision, have been proposed to be covered under the RL series in IS : 9316 ( untkr revision ).
0.4 In order to facilitate cross-reference, it has been decided to retainthe original discrete NRL series numbers assigned to various test methods,in IS : 3708 ( Parts 1· and 2t ) in the revised parts of IS : 3708.
0.4.1 For proper referencing of the existing test methods and the newmethods under revision, a statement showing corresponding methods isgiven in Appendix A.
.0.5 In preparing the above series, the need to align the test method. withthe corresponding ISO standards{DIS/DP wherever available has allObeen taken into account for updating the test methods. In the preparation of this standard, assistance has been derived from ISO 125-1983'Rubber latex, natural - Determination alkalinity', issued by the International Organization for Standardization ( ISO ).
• Methods of test for natural rubber latex: Part I Dry rubber content. aludgecontent, density, total alWiDity, KOH-number. mechanical stability, volatile fattyacid number, !'H, total nitrogen, total copper, total iron, total mangan_ and total uh.
fMethocis of teat for natUralrubbel' latex. Part 2-tMetbods of testa for styrene-butadiene rubber ( SBR ) latices:
Part I D..termination ofdry polymer, pi, density, residual Ityrme, bouud styree and_pconteut.
18 I 3701 ( Part .. ) - 1915
0.6 In reporting the result of a test or analysis made in a~cordance withthis standard, if the final value, observed or calulated, IS to be roundedoff, it shall be done in accordance with IS : 2-1960-.
1. SCOPE
1.1 This standard ( Part 4 ) prescribes a method for th~ .det~rminationof total alkalinity of natural rubber latex of Hmea fmuult1ISu, uncompounded and unvulcanized and subjected to some type of concentrationprocess other than heat concentration and which may containpreservatives.
2. OUTLINE OF THE METHOD
2.1 Latex is titrated to pfI 6'0 in the presence of a stabilizer, eitherelectrometrically, or alternatively with methyl red as visual indicator,and its alkalinity calculated from the quantity of acid which is required.
3. APPARATUS
3.1 pH Meter - equipped with glass electrodecell and capable of being read to 0'02 unit.
3.2 Chemical Balance
3.3 Weillai.. Bottle
3." Burette
and saturated calomel
... REAGENTS
4.1 Em.a1.iOD Stabiliaer - 5. percent ( mfm) solution of a DOn-IODlestabilizer of the ethylene oxide condensate type. Before we the pH ofthe solution shan be adjusted to a value of 6'0 ± 0'1. •
f.2 8a1pJaaric Add or Hydroclalorlc AdtI- 0'1 N (J" IS: 266-1mtand IS : 265-1976t ),
".3 bulfcator SoI.dOD - methyl red ( s" IS: 2263-1979§).
5. PROCEDURE
5.1 Take between 5 g and 10 g of the well-mixed sample in a weighingbottle fitted with a stopper. Weigh to the nearest O·Olg. To a 500-ml
-Rulea (or rouDdiDg Off'DlllllaCial valuea ( 'fIriud )t~pec:!ficat!OD for sulphuric acid ( ~...mn-)• •tl'pecification for hydroch1oric acid ( __ rmn. ).§Methods ofprepantion of indicator 1IOIutiom ( .PII,.,. ).
5
U I 3701 ( Part f ) ..1985
.quat beaker add 200 ml of water. Mix with water 10 ml of the stabilizer solution. Stir the water with a glass rod to distribute the stabilizer.Pour the latex !nto the ~er from the weighing bottle, restopper thebottle and reweigh to obtain the mass of latex added by difference.Stir to distribute the latex in the stabilizer solution. Insert the electrodesof the standardized pH meter and, with continual stirring, add froma burette the sulphuric acid or hydrochloric acid solution until the pH isreduced to a value of 6'0 ± 0'05. Add the acid drop by drop onapproaching the end-point. .
5.2 As an alternative to e1ec:trometric titration, use methyl red as visualindicator, taking the end-point as the colour change to pink.
NO'l'lI - The object of the stabilizer is to prevent coagulation of the Iates CD
~ofacid.
1ft
I. CALCt1LATlON
I., Calculate the alkalinity of the latex as specified in 6.1 or 6.2whichever is appropriate.
1.1 If the latex is preserved with ammonia, calculate its alkalinity asIJ'lDlI of ammonia (NH.) per 100 g of latex, as follows:
1'7 x N x VAlkalinity (as NH.) .,. -----
where
N = normality of the acid used,
Y _ volume in ml of acid used, and
1ft - mass in g of the test portion.
The results of the duplicate determinations shaIl not differ by morethan 0'02 UiUit where the actual alkalinity is above 0'5 unit, or shall notdifl'er by more than 0'01 unit where the actual alkalinity is 0'5 unit orleu. .
&.2 If the latex is preserved with potassium hydroxide, calculate itsalkalinity in grams of potassium hydroxide per 100 g of latex, as follow.:
Alkalinity ( as KOH ) = 5'61 X N X V1ft
where N. V and 1ft are .. defined in 6.1.
The results or the duplicate determinations shall not differ by morethaD 0'03 unit.
6
APPENDIX A( C'ous« 0.4.1 )
TABLE SHOWING COIUlESPONDENCE OF THE VARIOUS METHODS OF TESTCOVERED IN THE EXISTING IS I t316 ( PARTS I TO 5 }-1979, IS ,"16 (PART 6)1112, IS I 3701 (PART 1)-1966, IS 13'181 (PART 2)-19i1, IS I ts11 (PART 1 )-1967
WITH THE REVISION:PROPOSED REVISION OF 18 I 9516, IS I 3'101 AND IS I tsll
ExlllTllfO TaT MaTKODe PaoJ'Oellv RJrYUlIOIf___________._---J. ~ ,,-.- .A-- .....
Tftt Method IS : No. Part ( S~ria ) IS : No. Setin
RIQIAJlIl.
(I) (2) (3) (..) (S) (6)
RL SERIES
n.t~rmlnation of IUrlace tension IS 9316-1979 Part I IS : 9316 Part I ( RL : I ) "l-.I DetermwuioD 01vIIcoIity IS 9316-1979 Part 2 IS : 9316 Part 2 ( RL : 2 ) I
DetermiDatioa of eoaplum IS 9316-1979 Part 3 IS: 9316 Part 5 ( RL : 3 )CODIlDt
D.termiDatioD of lotal IOlich IS : 9316-1979 Part • IS: 9316 Part • ( RL : .. )cootlDt
I
UnderDrawbJ,oIl&mpl. IS: 9316-1979 Part.s IS: 9316 Part.s (RL: 5) RevilioDDetlflDlDAUOD oC,H IS: 9316-1982 Part 6 IS: 9316 Part 6 ( RL : 6 ) li\Determinad('lD oltolal copper IS: 3708-1966 Part 1 (NRL 13 ~ IS: 9316 Part 7 (RL : 7 ~ ..Determioatioa oItolll irOD IS: 3708-1966 Part I (NRL 14 IS: 9316 Part 8 ( RL: 8
iDet_illatioll OClota! mans anile IS: 3708-1966 ParI I (NRL 15 IS: 9316 ParI !I (RL: 9
NRL SERIES -o....miDatiOD of dry rubber IS : 3708-1966 Part 1 ( NRL : 1 ) IS: 3708 Part 1 ( NRL : I ) ...
cootent !DetermlDatioD oC alud,e CODtlDt IS 5708-1966 Part 1 (NRL 5 ~ IS 3708 Part 2 ~ NRL 5 ~ ..Determination of dlnslty IS 5708-1966 Part 1 (NRL 6 IS 3708 Part 3 NRL 6 ....-DetermiDatioll of total alblillity IS 3708-1966 Part I (NRL 7) IS 37011 Part" (NRL 7) •o....miDadon 01KoOH-number IS 3708-1966 Part 1 (NRL 8) IS 3708 Part 5 (NRL 8) ...DetermiDatioa 01 mechaDical IS 3708-1966 Part I (NRL 9) IS 5708 Part 6 (NRL 9) !ttabUity
EsDTDfG TaT MmBO»1 PaoPOS1m REVISION RJDlARltS -r----------- -'1 r------.A.-------, rI1Teat Method IS: No. Pan ( Seriea) IS: No. &erie. ..
(l) (2) (S) (4) (5) (6) iNU SERIES -..Determination or volatile ratty IS: 3708-1966 Part I ( NRL : 10) IS: 3708 Part 7 ( NRL : 10) 1 •..
acid numberIS: 3708·1966 Part 1 (NRL: 12) IS: 37011 Part 8 ( NRL : 12) I ..
Determination or total nitr0len ...Determiution or total aah IS: 3708-1966 Part 1 ( NRL : 16) IS: 3708 Part 9 ( NRL : 16) I -Determination or boric acid IS: 3708-1968 Part 2 ( NRL : 17) IS: 3708 Part 10 ( NRL : 17) i •Delermination or malftellum ...IS: 3708-1968 Part 2 ( NRL : 18) IS: 3708 Part I I ( NRL : 18) \ CoO
SBRL SERIES )- Under ~Determination or dry polymer IS : 4511·1967 Part I ~ SBRL : 1 ) IS : 45tl Part 1 ( SBRL : I ) I RevisionDt.lerminatlon or deDllty IS : 4511·1967 Part 1 SBRL: 6 ) IS : 451t Pan 2 ( SBRL : 6 ) IDetermination or reaiduaJ IS: 4511·1967 Part 1 ( SBRL : 8 ) IS : 451I Pan 3 ( SBRL : 8 ) IltyreDe( volatile umaturatel )Determinatloa or boundltY'" IS: 4511·1967 Part I ( SBRL : 9) IS: 4511 Part 4 ( SBRL: 9) J
CO Detamination or _p COntent IS: 4511·1967 Part I ( SBRL : 10) IS: 451t Pan 5 ( SBRL : 10 )
IS : 37. ( Part 4 ) • 1915
( CMliaUft- p." 2 )
Methods of Testing Subcommittee, PCDC 14: I
e--Da S. N. CBAB1U>TAnTY
RIjIr-mi",Modi Rubber Ltd, Modipuram
PadinjarekaraAgendes Ltd, KottayamL. G. BalakrishnaD .& Bros Ltd, CoimbatoreUnion Commercial and Industrial Co Ltd, Calcutta
MImMrISBltJ S. K. MU8TA" ( Allmutt, to
Dr S. N. Chakravarty )SHBl SATISB ABBAHAl[Suat P. S. B.u.A8UBIU....1OAXSsarA.N.BHATTACHABTA
Snal B. PAl'JA ( AlUmtU, )SJOU J. CBATTDJD ADdrew Yule & Co Ltd. Calcutta
SKBl A. K. BI.w....(~)Ssar P. K. CBATTnra Bayer ( India >. Ltd, Bombay
SHlll D. J. BRABUCBA ( AlunuIu)Da C. K. DAB NatioD&.l RubbeT M.nufact~ Ltd, Caleuua
Snal R. P. MATBUK ( Allmuzll )SDRI J. M. GAllO Directorate General of Teclmical Development,
New DelhiSJIlll G. R. KAVISHTAB Indian Rubber Re,enerating Co Ltd, Thane
SRBI P. S. VIllAlO ( Alt".".t, ) ..SJIlll PuLm L. Knuarw"'LA . Cosmos India Rubber Worb Pvt Ltd, Bombay
S.-I 5. N. GIU.D<m ( .flJnuII )Snr K. S. Loa....ATlIAlI' , Dunlop India Ltd, Calcutta
Da 5. CSATTOPADBTAY (.AllnuU)SHaI P. K. MADRAVA MEl'I'Olf Thirumbadi Rubber Co Ltd, MoUamSlUll A. K. MALLIK Indian Petroehemicals Corportion Ltd, P;O. Petro-
chemicals, VadodaraDa Y. N. SB.....A (All"".")
Dll W. MrLLn Indian Rubber -Maaufaeturen Research Aaoc:iationThane . _ . ,
Smn P. L. NAG . Ministry ofDefeDCe ( DGI ) .SWlI H. L. SaITAlITAT A ( .dltirut, ) .
S.a, P. K. P...m National Test House, CalcuttaDa S. B. RATH Synthetics & Chemicals Ltd, Bombay
5sa, H. C. CHOPRA ( .AlIIrut, )Ssa15. V. SUUlA Travancore Rubber & Tea Co Ltd, TriftDdrum
5BBI C. S. KlllSBJUSWAJIT (.All"JIIIII)5mn EoV. THOMAS Rubber Board, KottayamDaN.M.MAnmw(~)
Ssal V. G. ToUllLU Polyolefins Industries Ltd, Bombay5.a. V. K. SUD ( A/lmr;rU )
\
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