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Flamebloc GS 502

Flamebloc GS 502
Flamebloc GS 502
Product Code : 08
Product Description

Flamebloc GS 502

  •        Intumescent coating

  •         No halogen donor required

  •         GRAS chemistries

  •         Water cleanup

  •         Zero VOC



Flamebloc GS 502 is a white, aqueous-based, intumescent flame retardant coating that can be spray, brush, or roller applied.

Flamebloc GS 502 satisfies thermal barrier and/or ignition barrier requirements of the IBC code. Flamebloc GS 502 can be applied over substrates such as wood, dry wall, clean metal, and most plastics with excellent adhesion but is specifically made for coating polyurethane foam, such as found in insulation providing flame protection after curing.

Flamebloc GS 502 is a proprietary polymeric aminopolyphosphate flame retardant coating that meets GRAS (Generally Regarded as Safe) specifications and requires no halogen donor.

After curing and exposure to heat or flame, the Flamebloc GS 502 coating can intumesce, building a foam char up to 100 times the original applied coating thickness. The foam char that forms provides a functional thermal barrier protecting the substrate against both heat and flame. The proprietary active ingredients of this product contribute to flame resistance by melting below flaming temperatures and resolidifying in the form of a carbon layer char that acts as a barrier between the substrate and the flame. As a result, Flamebloc GS 502 will decrease smoke evolution. In addition, it will also provide resistance to flameless combustion, referred to as afterglow. While the information and material included in this presentation has been formulated with all due care, Buckman Laboratories Pty Ltd (henceforth Buckman) does not warrant or represent that the content is free from errors, or omissions or is definitive. Buckman does not accept liability in relation to the quality, operability or accuracy of the content. Recommendations give by Buckman are based on tests that have been performed with all due care and are, to the knowledge of Buckman, reliable. Ultimately, the use of each product is beyond the control of Buckman. No guarantee, express or implied is made as to the performance of each product or as to the effects of such or the results to be obtained if not used strictly in accordance with directions, recommendations or established safe practice by the customer. The customer must assume all responsibility for any loss, damage, cost or expense incurred or arising by reason of any use of the product as such, or in combination with other materials. Buckman recommends that the products are only used and handled by the buyer under the recommended conditions of use in accordance with established best safe practice.


Typical Product Characteristics

Density at 25ðC

1.30 ƒ 1.35 g/mL

pH (neat)

2.5 ƒ3.5

Total Solids

61 - 66%


Thermal Barrier

Ignition Barrier

1.6 m2/L

3.1 m2/L


Method of Application

Flamebloc GS 502 achieves flame retardant properties by blending four (4) parts of Flamebloc GS 502 with one (1) part of Bulab 501 by volume enabling the blended coating to cure forming a fire protective film.

Once activated, the coating has a working time of 1.5 hours at 25ƒ°C and can be applied by spray, brush, or roller. Clean-up is easily accomplished with warm or hot water and soap.

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