industry application

Magnesium Hydroxide Flame Retardant Solutions

Halogen-free, low-smoke fire protection for cables, PP, PE, EVA and rubber compounds — high-purity and surface-treated Mg(OH)₂ grades engineered for polymer processing.

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decomposition onset 330°C+no toxic smokereach compliant

Magnesium hydroxide is the leading halogen-free flame retardant (HFFR) for polyolefins and elastomers. It absorbs heat endothermically and releases water vapor at 330–430 °C — suppressing flame, diluting combustible gases and cooling the polymer — while leaving no corrosive or toxic smoke. That makes Mg(OH)₂ the default choice for LSZH cable sheathing, building materials and e-mobility interiors where halogenated FRs are restricted.

recommended grades

Which Grade to Use

Grade	Typical loading	Best for
High Purity Mg(OH)₂ (≥99%)	50–65 phr	LSZH cable compounds, PP/PE profiles — highest whiteness & thermal stability
Surface-Modified Mg(OH)₂	55–70 phr	High-loading EVA/TPO systems — better dispersion, higher elongation at break
Custom particle-size grades	tailored	Thin-wall extrusion and co-extrusion lines needing specific D50

how it performs

Mechanism & Processing Notes

• Endothermic cooling: absorbs ≈1.3 kJ/g from the burning polymer, lowering the decomposition rate of the matrix.
• Char & oxide layer: the MgO residue forms a protective barrier that reduces heat transfer and drips.
• Low smoke, zero halogen: passes IEC 60754, EN 45545 and UL 94 V-0 at practical loadings when paired with synergists.
• Processing: use the modified grade for fill factors above 55 phr — silane/titanate treatment protects polymer viscosity and mechanical elongation.

Deep-dive: read our technical guide Why Magnesium Hydroxide Is the Halogen-Free Flame Retardant of Choice for formulation comparisons with ATH and halogen systems.