Magnesium Hydroxide (MDH) Flame Retardant

Name: Magnesium Hydroxide (MDH) Flame Retardant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 1309-42-8

Magnesium hydroxide (MDH) is an inorganic, halogen-free flame retardant and smoke suppressant that decomposes endothermically at 300–320 °C, releasing water and forming a stable magnesium oxide char layer. Its higher decomposition temperature compared to ATH makes it suitable for engineering thermoplastics processed above 200 °C, including polyamides, polypropylene, and XLPE. MDH is widely used in high-temperature cable insulation, automotive parts, and construction materials requiring UL94 and IEC 60332 compliance.

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Technical Specifications

appearance	White powder
moisture (%)	<0.3
particle size D50 (µm)	0.8–5 (multiple grades)
specific surface area (m²/g)	5–15
MgO content after ignition (%)	≥99
decomposition temperature (°C)	300–320

Applications

High-temperature wire and cable insulation in PP, XLPE, and PA compounds
Automotive interior parts and under-hood plastic components
Halogen-free flame-retardant polyolefin sheets for construction
Rubber and elastomer compounds with demanding temperature requirements
Thermoplastic elastomer (TPE/TPO) floor and roofing membranes

Key Features

High decomposition temperature (300–320 °C) allows use in engineering thermoplastics processing above 200 °C
Forms stable MgO char layer that physically shields underlying material from further combustion
Halogen-free and low toxicity, compliant with REACH, RoHS, and EN 50267 cable smoke standards
Surface-treated grades with stearic acid or silane coupling agents available for better polymer wetting