Sabic VALOX™ FR PBT 4631
Valox FR PBT 4631 Flame Retardant Grade
VALOX™ FR Resin 4631 is a 30% glass-filled, flame-retardant PBT engineered for injection molding. It delivers superior mechanical strength, excellent electrical properties, and a critical UL94 V-0 flame rating for safe, reliable components.
Associated Documents
TDS Europe
Typical property data
Physical Properties
- Specific Gravity: 1.67 (ASTM D792, ISO 1183)
- Filler Content: 30% (ASTM D229)
- Mold Shrinkage (Flow): 0.1 – 0.3% (SABIC Method)
- Mold Shrinkage (Cross-Flow): 0.4 – 0.7% (SABIC Method)
- Water Absorption (23°C, Saturated): 0.25% (ISO 62-1)
- Moisture Absorption (23°C / 50% RH): 0.07% (ISO 62)
Mechanical Properties
- Tensile Stress (Yield): 130 MPa (ISO 527, ASTM D638)
- Tensile Strain (Break): 2% (ISO 527, ASTM D638)
- Tensile Modulus: 11,500 MPa (ISO 527, ASTM D638)
- Flexural Stress (Yield): 200 MPa (ISO 178, ASTM D790)
- Flexural Modulus: 9,600 MPa (ISO 178, ASTM D790)
- Ball Indentation Hardness: 115 MPa (ISO 2039-1)
- Rockwell Hardness (R): 118 (ISO 2039-2)
Impact Properties
- Charpy Impact Strength (Unnotched, 23°C): 50 kJ/m² (ISO 179/2C)
- Charpy Impact Strength (Unnotched, -30°C): 50 kJ/m² (ISO 179/2C)
- Izod Impact Strength (Notched, 23°C): 80 J/m (ASTM D256)
- Izod Impact Strength (Notched, -30°C): 80 J/m (ASTM D256)
- Izod Impact Strength (Unnotched, 23°C): 45 kJ/m² (ISO 180/1U)
- Izod Impact Strength (Notched, 23°C): 8 kJ/m² (ISO 180/1A)
Thermal Properties
- Vicat Softening Temperature (Rate A): 220°C (ISO 306)
- HDT (0.45 MPa): 220°C (ISO 75/Bf)
- HDT (1.8 MPa): 205°C (ISO 75/Af)
- Coefficient of Thermal Expansion (Flow, 23°C to 80°C): 1.6E-05 1/°C (ISO 11359-2)
- Coefficient of Thermal Expansion (Cross-Flow, 23°C to 80°C): 1.2E-04 1/°C (ISO 11359-2)
- Relative Temperature Index (Electrical): 130°C (UL 746B)
- Relative Temperature Index (Mechanical without Impact): 140°C (UL 746B)
Electrical Properties
- Volume Resistivity: >1E+15 Ω·cm (IEC 60093, ASTM D257)
- Surface Resistivity: >1E+15 Ω (IEC 60093)
- Dielectric Strength (in oil, 0.8 mm): 27 kV/mm (IEC 60243-1)
- Dielectric Strength (in oil, 3.2 mm): 19 kV/mm (IEC 60243-1)
- Comparative Tracking Index (CTI): 250 V (IEC 60112)
Flame Characteristics
- UL Flame Class Rating: UL94 V-0 at 0.75 mm (UL 94)
- Glow Wire Flammability Index: 960°C at 3 mm (IEC 60695-2-12)
- Oxygen Index (LOI): 34% (ISO 4589)
Injection Molding
- Drying Temperature: 110 – 120°C
- Drying Time: 2 – 4 hours
- Maximum Moisture Content: 0.02%
- Melt Temperature: 250 – 270°C
- Nozzle Temperature: 240 – 260°C
- Mold Temperature: 40 – 100°C
Features & Benefits
Superior Flame Retardancy & Safety
This grade achieves a UL94 V-0 rating at 0.75mm, ensuring your components meet strict safety standards and resist ignition, which is vital for electrical enclosures and connectors.
High Strength & Thermal Stability
With 30% glass reinforcement, it offers high tensile strength and can withstand continuous high temperatures, ensuring long-term performance and durability in demanding environments.
Excellent Electrical Insulation Properties
Its high volume resistivity and comparative tracking index (CTI) make it an outstanding electrical insulator, preventing current leakage and short circuits in high-voltage applications.
Use & Application
- Electrical Components: Circuit breakers, switches, and relay housings.
- Automotive Systems: Sensors, motor end caps, and under-hood connectors.
- Industrial Equipment: Power tool housings, control system housings, and coil bobbins.
- Consumer Appliances: Connectors and internal components in printers, smart meters, and power supplies.