Halogen-free phosphorus-based flame retardant specifically engineered for polyamide (PA6, PA66) compounds.
Excellent thermal stability enabling processing up to 280 °C without significant degradation.
Good compatibility with glass-fiber-reinforced polyamide matrices, minimizing blooming and maintaining mechanical integrity.
Enables UL 94 V-0 rating at low loading levels (typically 10–15 wt% in PA66 GF30).
Low impact on polymer color—supports natural and light-colored end products without yellowing.
Electrical and electronic housings requiring stringent fire safety compliance (e.g., connectors, switches, circuit breakers).
Automotive under-hood components including sensor housings, fuse boxes, and ignition system parts.
Industrial automation enclosures and control cabinet components exposed to elevated ambient temperatures.
Consumer appliance parts where flame retardancy and long-term dimensional stability are critical (e.g., coffee machine housings, power tool casings).
LED lighting fixtures demanding high CTI (>600 V) and low smoke density.
| Chemical Type | Organophosphorus compound (phosphinate-based) |
| Product Form | Free-flowing white granules |
| Appearance | Off-white to pale yellow granules |
| Density (23 °C) | 1.55–1.65 g/cm³ |
| Melting Range | 270–290 °C (DSC, heating rate 10 K/min) |
| Moisture Content (max.) | 0.15 wt% |
| pH Value (1% aqueous dispersion) | 6.5–7.5 |
| Primary Applications | Flame retardant additive for engineering thermoplastics, especially polyamide 6 and 66 |
Q1: What is the primary mechanism of flame retardancy for MELAPUR200 PA?
A: MELAPUR200 PA functions primarily through an intumescent mechanism in polyamide matrices, promoting the formation of a protective, carbon-rich char layer upon exposure to heat or flame. This char acts as a physical barrier that insulates the underlying polymer and limits mass and heat transfer.
Q2: Is MELAPUR200 PA compatible with common polyamide grades such as PA6 and PA66?
A: Yes, MELAPUR200 PA is specifically engineered for compatibility with standard aliphatic polyamides including PA6 and PA66. It demonstrates good dispersion and thermal stability during melt processing, with minimal impact on mechanical properties when properly compounded.
Q3: How does MELAPUR200 PA affect the processing behavior of polyamide compounds?
A: The additive typically exhibits low volatility and good thermal stability up to standard polyamide processing temperatures. It may slightly reduce melt viscosity depending on loading level and formulation, but generally supports stable extrusion and injection molding without significant degradation or plate-out issues.
Q4: Can MELAPUR200 PA be used in applications requiring halogen-free flame retardancy?
A: Yes, MELAPUR200 PA is a halogen-free flame retardant system, making it suitable for applications where halogen content must be avoided—such as in electronics enclosures, automotive interior components, and consumer goods subject to environmental compliance expectations.
Q5: What is the typical dosage range for achieving UL94 V-0 rating in thin-wall PA6 or PA66 parts?
A: Dosage depends on part geometry, wall thickness, and base resin characteristics, but effective flame retardancy for UL94 V-0 classification in thin-wall sections is generally achieved at loadings ranging from 0.1% to 2% by weight—optimized through application-specific compounding and testing.
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