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Halogen-free flame retardancy meeting UL 94 V-0 at 1.6 mm thickness.
Excellent mechanical strength and stiffness retention after humid conditioning.
Good processability with stable melt flow for injection molding of thin-walled parts.
Low smoke density and reduced toxic gas emission during combustion (compliant with EN 45545-2 for rail applications).
Consistent color stability and surface quality in high-volume production runs.
Electrical connectors and housings for industrial automation systems.
Busbar supports and insulating components in low-voltage switchgear.
Interior components for railway rolling stock (e.g., ceiling panels, ducts, trim).
Enclosures for LED lighting fixtures requiring fire-safe materials.
Power tool housings and battery compartment covers in portable electronics.
| Chemical Type | Polyamide 6 (PA6) with halogen-free flame retardant system |
| Product Form | Natural-colored granules |
| Appearance | Free-flowing, cylindrical pellets, uniform size and color |
| UL 94 Rating (1.6 mm) | V-0 |
| EN 45545-2 Compliance | R22/R23 (HL3 level for interior use) |
| Melt Volume Rate (MVR, 275 °C/5 kg) | 28 cm³/10 min |
| Density (ISO 1183) | 1.28 g/cm³ |
| Moisture Content (as supplied) | ≤ 0.25 wt% |
Q1: What is the primary flame retardant mechanism in Ultramid B3U Q721?
A: Ultramid B3U Q721 utilizes a halogen-free, phosphorus-based flame retardant system that acts primarily in the condensed phase—promoting char formation and reducing fuel release during thermal decomposition.
Q2: Is this grade suitable for thin-wall electronic housing applications requiring UL 94 V-0 at 0.75 mm?
A: Yes—Ultramid B3U Q721 is specifically formulated to achieve UL 94 V-0 classification at wall thicknesses down to 0.75 mm, making it well-suited for compact, high-integration electronics enclosures where flame resistance and dimensional stability are critical.
Q3: How does processing this grade differ from standard PA6 materials?
A: While compatible with conventional injection molding equipment, Ultramid B3U Q721 benefits from slightly reduced melt temperatures and controlled residence time to preserve flame retardant integrity; drying conditions remain similar to standard PA6—typically 4 hours at 80 °C under dehumidified air.
Q4: Can it be used in applications requiring long-term thermal aging performance?
A: Yes—the base PA6 matrix and optimized flame retardant package provide good retention of mechanical properties after prolonged exposure to elevated temperatures, supporting reliable performance in automotive and industrial components operating intermittently up to 120 °C.
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