Hexabromocyclododecane (HBCD)

Name: Hexabromocyclododecane (HBCD)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 25637-99-4

Hexabromocyclododecane (HBCD) is an additive cycloaliphatic brominated flame retardant historically used in expanded polystyrene (EPS) and extruded polystyrene (XPS) thermal insulation boards in the construction sector, as well as textile back-coatings. It provides effective flame retardancy at low loadings (0.5–1.5%) in polystyrene foam. Note: HBCD is listed as a Persistent Organic Pollutant (POP) under the Stockholm Convention and is restricted or banned in the EU, USA, and many other jurisdictions; buyers must verify local regulations before procurement.

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Technical Specifications

appearance	White crystalline powder
moisture (%)	<0.2
thermal stability	Stable to 180 °C
bromine content (%)	73.5–74.5
melting point (°C)	172–184
particle size D50 (µm)	5–15

Applications

Legacy FR in expanded polystyrene (EPS) insulation boards for construction (restricted in EU/Stockholm)
Extruded polystyrene (XPS) foam insulation boards for building envelopes
Textile and upholstery fabric back-coating in markets where permitted
Polystyrene packaging foam flame retardant in non-restricted jurisdictions
Research reference standard for analytical and environmental monitoring purposes

Key Features

Very high bromine content (74%) achieves effective FR at ultra-low loading (0.5–1.5%) in EPS foam
Minimal effect on EPS thermal insulation properties and mechanical performance at low use levels
Low melting point variants available for improved EPS bead coating during pearl polymerization
Regulatory caution: subject to Stockholm Convention POP listing and regional bans — confirm local compliance