Melamine Cyanurate MC-25 (Fine Grade, D50 ≤4μm)
Número CAS: 37640-57-6
MC-25 is the standard fine-powder grade of Melamine Cyanurate (MCA), a halogen-free nitrogen-based additive flame retardant with D50 ≤4μm and D98 ≤8μm. Rated "exceptionally good" dispersibility, it is the most widely used grade in the MCA product line and the benchmark for PA6, PA66, PBT, unsaturated polyester (UPR), and silicone rubber applications. MCA (C3H6N6·C3H3N3O3) is a supramolecular hydrogen-bonded complex of melamine and cyanuric acid. It provides flame retardancy through endothermic decomposition, melamine sublimation (gas-phase dilution), and anti-drip behavior generated by cyanuric acid in the condensed phase. MC-25 achieves UL 94 V-0 at 1.6 mm in unreinforced PA6 at 12–14% loading and PA66 at 10–12% loading. Manufactured with very low melamine residue (≤0.01%) to minimize die buildup and surface bloom. ROHS and EU REACH registered.
Especificaciones Técnicas
| Whiteness | ≥ 97% |
| Appearance | White crystalline powder |
| Bulk Density | ≥ 0.3 g/cm³ |
| Dispersibility | Exceptionally good |
| Melamine Residue | ≤ 0.01% |
| Moisture Content | ≤ 0.2% |
| Molecular Formula | C3H6N6·C3H3N3O3 |
| Particle Size D50 | ≤ 4 μm |
| Particle Size D98 | ≤ 8 μm |
| pH (10% suspension) | 5.0–7.0 |
| Purity (MCA content) | ≥ 99.5% |
| Cyanuric Acid Residue | ≤ 0.3% |
| 1% Decomposition Temperature | ≥ 310 °C |
Aplicaciones
- Unreinforced PA6 and PA66 FR compounds (V-0 at low loading)
- Glass fiber reinforced PA6/PA66 FR compounds
- PBT flame-retardant engineering plastic formulations
- Unsaturated polyester resin (UPR) and vinyl ester systems
- Silicone rubber FR compounds
- Epoxy resin flame-retardant systems
Características Principales
- Halogen-free — compliant with ROHS, EU REACH, and OEKO-TEX requirements
- Exceptionally good dispersibility — D50 ≤4μm with narrow distribution
- Very low melamine residue (≤0.01%) — minimizes die buildup and surface bloom in PA processing
- High thermal stability ≥310°C — no foaming in glass fiber reinforced PA66
- Low addition level: V-0 at 1.6mm in PA6 (12–14%) and PA66 (10–12%)
- High whiteness (≥97%) with minimal color impact on compounded parts
- Insoluble in water and organic solvents — no migration or blooming over time
- Layered crystal structure contributes lubrication effect in polymer processing
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CAS Number
37640-57-6
Category
Químicos Retardantes de LlamaAvailability
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