Sabic VALOX™ FR PBT 357
Plastic Granules
Valox FR PBT 357 Flame Retardant Grade
Valox FR PBT 357 is a flame-retardant, impact-modified PBT/PC blend. It offers superior chemical resistance and top-tier safety certifications (UL94 V-0 @ 0.63mm & 5VA @ 3.0mm), making it ideal for demanding electrical components.
Typical property data
Physical Properties
- Specific Gravity: 1.34 (ASTM D792; ISO 1183)
- Specific Volume: 0.75 cm³/g (ASTM D792)
- Water Absorption (23°C/24 hrs): 0.08% (ASTM D570)
- Water Absorption (23°C/saturated): 0.5% (ISO 62-1)
- Moisture Absorption (23°C/50% RH): 0.15% (ISO 62)
- Mold Shrinkage (flow, 3.2 mm): 1 – 1.4% (SABIC method)
- Melt Flow Rate (250°C/5.0 kgf): 9.6 g/10 min (ASTM D1238)
- Melt Volume Rate (MVR at 250°C/5.0 kg): 8 cm³/10 min (ISO 1133)
Mechanical Properties
- Tensile Stress (Yield): 48 MPa (ASTM D638)
- Tensile Stress (Break): 45 MPa (ASTM D638)
- Tensile Strain (Yield): 5% (ASTM D638)
- Tensile Strain (Break): 110% (ASTM D638)
- Tensile Modulus: 2020 MPa (ASTM D638)
- Flexural Stress (Yield): 83 MPa (ASTM D790)
- Flexural Modulus: 2060 MPa (ASTM D790)
- Hardness: Rockwell R 117 (ASTM D785)
Impact Properties
- Izod Impact, Notched (23°C): 534 J/m (ASTM D256)
- Izod Impact, Notched (-30°C): 153 J/m (ASTM D256)
- Instrumented Dart Impact (23°C): 35 J (ASTM D3763)
- Charpy Impact, V-notch (23°C): 45 kJ/m² (ISO 179/1eA)
Thermal Properties
- Vicat Softening Temperature (Rate B/50): 145°C (ISO 306)
- Heat Deflection Temperature (0.45 MPa): 138°C (ASTM D648)
- Heat Deflection Temperature (1.82 MPa): 99°C (ASTM D648)
- Relative Temperature Index (Electrical): 120°C (UL 746B)
- Relative Temperature Index (Mechanical w/ Impact): 120°C (UL 746B)
- Relative Temperature Index (Mechanical w/o Impact): 140°C (UL 746B)
Electrical Properties
- Volume Resistivity: >1.2E+16 Ω·cm (ASTM D257)
- Dielectric Strength (in air, 3.2 mm): 18.5 kV/mm (ASTM D149)
- Dielectric Strength (in oil, 1.6 mm): 25.2 kV/mm (ASTM D149)
- Relative Permittivity (100 Hz): 3.2 (ASTM D150)
- Dissipation Factor (100 Hz): 0.003 (ASTM D150)
Flame Characteristics
- UL Recognized, 94V-0 Flame Class Rating (0.63 mm) (UL 94)
- UL Recognized, 94-5VA Flame Class Rating (3 mm) (UL 94)
- Oxygen Index (LOI): 30% (ASTM D2863)
Injection Molding
- Drying Temperature: 120°C
- Drying Time: 3–4 hours
- Maximum Moisture Content: 0.02%
- Melt Temperature: 250–265°C
- Mold Temperature: 50–75°C
- Screw Speed: 50–100 rpm
Features & Benefits
Superior Flame Retardant Safety
This FR PBT resin 357 achieves UL94 V-0 at just 0.63mm, allowing for thinner, lighter, and more cost-effective part designs without compromising critical fire safety standards in enclosures and connectors.
Exceptional Toughness and Impact Strength
The material is impact-modified, providing high ductility and resistance to cracking during assembly or accidental drops. This durability ensures long-term reliability for components like switches and bobbins.
Reliable Performance in Heat
With a High Heat Deflection Temperature (HDT), components made from VALOX 357 maintain their shape and integrity in elevated temperature environments, ensuring consistent performance and preventing deformation.
Use & Application
- Bobbins & Coil Formers
- Circuit Breakers & Switches
- Electrical Connectors & Enclosures
- Sensor Housings & Motor Components