Pentaerythritol Intumescent Char-Forming Additive

Name: Pentaerythritol Intumescent Char-Forming Additive
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 115-77-5

Pentaerythritol used as the carbon source component in intumescent coating (IFR) systems, working synergistically with ammonium polyphosphate (acid source) and melamine (gas source) to form a dense, insulating char on steel and wood surfaces when exposed to heat. As the carbonific component, pentaerythritol provides the polyhydroxy substrate that reacts with phosphoric acid to create the stable intumescent char network. It is the standard carbon source in the classic APP/PER/MEL ternary intumescent system used in structural steel fireproofing coatings.

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Technical Specifications

appearance	White crystalline powder
purity (%)	≥98
moisture (%)	<0.1
ash content (%)	<0.005
melting point (°C)	258–260
hydroxyl value (mgKOH/g)	1640–1660

Applications

Carbon source in APP/PER/MEL ternary intumescent coatings for structural steel fireproofing
Solvent-based and waterborne intumescent coatings for timber and engineered wood
Intumescent fire-stop compounds and boards for passive fire protection
Component in halogen-free intumescent FR compounds for polyolefins
Carbonific agent in intumescent fire-resistant glazing sealants and compounds

Key Features

High hydroxyl functionality (4 OH groups per molecule) maximizes char yield in IFR systems
Standard carbon source in the proven APP/PER/MEL ternary intumescent system for steel coatings
High melting point (258–260 °C) ensures solid-state stability during intumescent coating manufacture
Halogen-free and low toxicity, compliant with fire protection standards EN 13501, UL263, and ASTM E119