1. REQUIREMENTS

1. Composition

Intumescent fire retardant paint shall comprise of vinyl acetate acrylic co-polymer emulsion,intumescence agents and pigments. Ammonium polyphosphate, pentaerythritol, dicyndiamideare used as intumescence agents and titanium dioxide as pigment, whereas vinyl acetate acrylic co-polymer is used as a binder. Phosphorus content in the pigment, when examined shall not be less than 20%.

The paint shall be suitable for application by brush or by airless spray (with 5-7% deionisedwater) to provide uniform coating having thickness of 250 ± 25 microns in single coat.Intumescent fire retardant paint shall be water based single pack system and should be mixedthoroughly before use. Thickness of the coat in single or two coats shall be suitable for a fire resistance of two hours. The structural steel surfaces shall be applied with suitable primers after surface preparation before application of intumescent paint.

2. The paint shall also conform to requirements given in Table 1.

Table 1

Sl. No . (1)

Characteristics (2) Requirements (3) Method of testRef. to IS: 101 Annex

1 Colour White/Off-White Part 4/Sec 2)

2 Preliminary examination

Stirring should easily produce a smooth uniform paint suitable for application by brush or airless spray (with 5-7% de-ionised water).

Part 1/Sec 2

3 Application properties and finish

Paint film shall be uniform and free from defects

Part 1 /Sec 4

4 Consistency Thixotropic Part 1/Sec 2

5 Drying time , minutes (At 65% RH), max. (a) Surface dry (b) Hard dry 60 120

(Part 3 / Sec 1 )

6 Dry film thickness, microns

250 ± 25 (Part3 / Sec 2)

7 Scratch hardness, gm, minimum(1000 g)

To pass the test Cl 3 of (Part 5/Sec 2)

8 Flexibility and adhesion(Bend test) (using 25 mm diameter mandrel)

To pass the test Cl 2 of (Part 5/Sec 2)

9 Mass / 10 litres, kg 13.7± 0.3 (Part 1/ Sec 7 )

10 Percent pigment, Minimum

40 B

11 Percent volatile matter, Maximum

30 (Part 2 / Sec 2 )

12 Fire test (a) Char height, mm Min (b) Flame spread Length, mm, max c) Time after glow,Sec d)Time after flaming, Sec 30.0 127 Nil Nil

C

13 Keeping properties Not less than one year from date of manufacturing

(Part 6/Sec 2)