Expandable Graphite Flame Retardant

Name: Expandable Graphite Flame Retardant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 1034343-98-0

Expandable graphite (EG) is an intercalated graphite compound that undergoes rapid intumescent expansion (50–300x) when heated above 200 °C, forming an insulating worm-like char that physically blocks heat and flame from reaching the underlying material. It is widely used in polyurethane foam, intumescent coatings, sealants, and rubber as a highly effective non-halogen flame retardant. EG is particularly valued for its mechanical intumescent action independent of chemical char-forming reactions, providing reliable fire protection even in non-charring polymers.

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Technical Specifications

appearance	Gray-black flakes or powder
moisture (%)	<1.0
carbon content (%)	≥95
particle size (mesh)	50, 80, 100, 150 (multiple grades)
expansion onset temperature (°C)	180–220
expansion volume (mL/g at 900°C)	200–300

Applications

Rigid and flexible polyurethane foam for building insulation with B1/B2 fire rating
Intumescent fire-stop sealants, caulks, and foam for cable and pipe penetrations
Intumescent structural steel fireproofing coating acid source replacement
Rubber EPDM roof membranes and automotive seals requiring FR
Epoxy and polyurethane adhesive fire-retardant systems for construction joints

Key Features

Physical intumescent expansion (200–300 mL/g) creates insulating char 50–300x original volume instantly on heating
Halogen-free and low smoke: no corrosive gases or toxic combustion products released on expansion
Expansion onset adjustable (180–220 °C) through intercalant chemistry to match specific polymer processing
Multiple mesh sizes available to balance foam cell structure quality with FR expansion performance