Albemarle MARTINAL ON-921 is a sustainable aluminum hydroxide flame retardant that delivers dual functionality as both fire suppressant and performance filler. This halogen-free solution provides reliable fire protection through endothermic decomposition while maintaining excellent processability. Its optimized particle design ensures superior dispersion in polymer matrices, making it particularly effective for applications demanding both environmental compliance and high flame retardant efficiency.
High-Efficiency Protection - 82.3% bromine content for maximum flame retardancy
UV Stability - Excellent color retention in outdoor applications
Thermal Performance - Maintains effectiveness at elevated temperatures
Material Compatibility - Works with various polymer systems
Sustainable Solution - Suitable for recyclable material streams
Electronics - Housings for sensitive equipment
Wire & Cable - Flame-resistant insulation materials
Textiles - Protective fabrics and fibers
Construction - Fire-safe building components
Automotive - Interior and under-hood components
Chemical Composition | Ethylene - 1,2 - bis(pentabromophenyl) |
Appearance | White powder |
Average Particle Size | 5 µm |
Specific Gravity | 3.25 |
Bulk Density (Aerated) | 868 kg/m³ |
Bulk Density (Packed) | 1760 kg/m³ |
Melting Point | 350 °C (Initial) |
Bromine Content (Theoretical) | 82.3% |
Water Solubility (25 °C) | Max. 0.01 wt.% |
Toluene Solubility (25 °C) | Max. 0.01 wt.% |
1% Weight Loss Temperature (TGA, 10 °C/min, N₂) | 347 °C |
5% Weight Loss Temperature (TGA, 10 °C/min, N₂) | 384 °C |
10% Weight Loss Temperature (TGA, 10 °C/min, N₂) | 401 °C |
50% Weight Loss Temperature (TGA, 10 °C/min, N₂) | 446 °C |
90% Weight Loss Temperature (TGA, 10 °C/min, N₂) | 554 °C |
Q1: What is the primary chemical nature and mechanism of action for MARTINAL ON-921?
A: MARTINAL ON-921 is an organophosphorus-based flame retardant designed to act primarily in the condensed phase, promoting char formation and reducing fuel release during thermal decomposition. It is not a halogenated compound and functions without generating corrosive or persistent combustion by-products.
Q2: In which polymer systems is MARTINAL ON-921 most commonly used?
A: This additive is especially effective in engineering thermoplastics such as polyamide (PA6 and PA66), polybutylene terephthalate (PBT), and polycarbonate blends. It is also compatible with certain thermoset resins where low smoke and good electrical insulation properties are required.
Q3: How does MARTINAL ON-921 affect processing and end-product properties?
A: It exhibits good thermal stability up to typical melt-processing temperatures and generally maintains mechanical performance—such as tensile strength and impact resistance—in formulated polymers. Its low volatility helps minimize plate-out and die buildup during extrusion or injection molding.
Q4: Is MARTINAL ON-921 suitable for applications requiring regulatory compliance with RoHS or REACH?
A: Yes—MARTINAL ON-921 is free of restricted substances listed under RoHS Directive (2011/65/EU) and is registered under REACH. Albemarle provides full documentation support for supply chain declarations and compliance verification upon request.
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