Name: Intumescent Base for Fire-Stop Sealants IFS-300
Brand: Coatingsink
SKU: intumescent-base-fire-stop-sealant
Availability: PreOrder

Question 1

At what temperature does IFS-300 begin to intumesce, and what expansion ratio is achievable?

Accepted Answer

IFS-300 begins intumescing at 200–220°C as ammonium polyphosphate (APP) decomposes to release phosphoric acid and ammonia, triggering intercalate expansion of the graphite worm structure. A minimum 10× volumetric expansion is achieved at 300°C. In optimally formulated joint sealants this translates to EI 90 or EI 120 fire resistance ratings per EN 1366-4 penetration seal testing.

Question 2

How should IFS-300 be blended into silicone or acrylic sealant binders without degrading expansion performance?

Accepted Answer

For silicone-based systems, disperse IFS-300 at 60–70 phr into the polymer base under low shear (≤500 rpm planetary mixer) before adding the crosslinker package. For acrylic latex binders, blend at 50–65 phr at 300–500 rpm. Avoid high-shear equipment such as bead mills or rotor-stator mixers — mechanical damage to the expandable graphite worm morphology directly reduces expansion ratio and compromises fire resistance classification.

Question 3

Is IFS-300 halogen-free and suitable for low-smoke fire-stop systems in transit and data centre applications?

Accepted Answer

Yes. IFS-300 is based exclusively on expandable graphite and ammonium polyphosphate — both halogen-free intumescent agents — with no chlorinated or brominated flame retardants. The formulation meets the halogen-free criterion per IEC 60754-1 and produces minimal toxic gas evolution during charring, qualifying it for LSHF (low-smoke halogen-free) fire protection in rail transit, data centres, and offshore oil-and-gas installations.

Solid Content	≥85%
Viscosity (23°C)	15,000–25,000 mPa·s
pH (10% aqueous slurry)	6.0–8.0
Expansion Ratio (300°C)	>10× volumetric
Intumescence Onset Temperature	200–220°C

Intumescent Base for Fire-Stop Sealants IFS-300

Specifications

FAQ

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