Sabic VALOX™ FR PBT 357M
Plastic Granules
Sabic Valox FR PBT 357M Flame Retardant Grade
VALOX™ FR 357M is a high-performance, flame-retardant PBT+PC alloy. It is impact-modified for toughness and designed with a built-in mold release, making it an ideal, reliable choice for demanding electrical components.
Associated Documents
TDS Americas
Typical property data
Physical Properties
- Specific Gravity: 1.34 (ASTM D792)
- Specific Volume: 0.75 cm³/g (ASTM D792)
- Water Absorption (23°C, 24 hrs): 0.08% (ASTM D570)
- Mold Shrinkage (Flow, 0.75–2.3 mm): 0.8–1.1% (SABIC method)
- Mold Shrinkage (Flow, 2.3–4.6 mm): 1.0–1.4% (SABIC method)
- Mold Shrinkage (Cross-flow, 0.75–2.3 mm): 0.9–1.3% (SABIC method)
- Mold Shrinkage (Cross-flow, 2.3–4.6 mm): 1.2–1.6% (SABIC method)
Mechanical Properties
- Tensile Stress (Yield, Type I, 50 mm/min): 48 MPa (ASTM D638)
- Tensile Stress (Break, Type I, 50 mm/min): 48 MPa (ASTM D638)
- Tensile Strain (Break, Type I, 50 mm/min): 110% (ASTM D638)
- Flexural Stress (Yield, 1.3 mm/min, 50 mm span): 82 MPa (ASTM D790)
- Flexural Modulus (1.3 mm/min, 50 mm span): 2060 MPa (ASTM D790)
- Hardness (Rockwell R): 117 (ASTM D785)
Impact Properties
- Izod Impact (Unnotched, 23°C): 3200 J/m (ASTM D4812)
- Izod Impact (Notched, 23°C): 530 J/m (ASTM D256)
- Gardner Impact (23°C): 43 J (ASTM D3029)
Thermal Properties
- HDT (0.45 MPa, 6.4 mm, unannealed): 137°C (ASTM D648)
- HDT (1.82 MPa, 6.4 mm, unannealed): 98°C (ASTM D648)
- Coefficient of Thermal Expansion (Flow, -40°C to 40°C): 9.18 × 10⁻⁵ 1/°C (ASTM E831)
- Coefficient of Thermal Expansion (Flow, 60°C to 138°C): 1.24 × 10⁻⁴ 1/°C (ASTM E831)
- Relative Thermal Index (Electrical): 120°C (UL 746B)
- Relative Thermal Index (Mechanical with impact): 120°C (UL 746B)
- Relative Thermal Index (Mechanical without impact): 140°C (UL 746B)
Electrical Properties
- Volume Resistivity: >1.2 × 10¹⁶ Ω·cm (ASTM D257)
- Dielectric Strength (In air, 3.2 mm): 18.5 kV/mm (ASTM D149)
- Dielectric Strength (In oil, 1.6 mm): 25.1 kV/mm (ASTM D149)
- Dielectric Strength (In oil, 3.2 mm): 18.5 kV/mm (ASTM D149)
- Relative Permittivity (100 Hz): 3.2 (ASTM D150)
- Relative Permittivity (1 MHz): 3.2 (ASTM D150)
- Dissipation Factor (100 Hz): 0.003 (ASTM D150)
- Dissipation Factor (1 MHz): 0.03 (ASTM D150)
- Arc Resistance (Tungsten): PLC Code 6 (ASTM D495)
- Hot Wire Ignition: PLC Code 2 (UL 746A)
- High Voltage Arc Tracking Rate: PLC Code 3 (UL 746A)
- High Ampere Arc Ignition (Surface): PLC Code 3 (UL 746A)
- Comparative Tracking Index (CTI): PLC Code 2 (UL 746A)
Flame Characteristics
- UL Recognized, 94HB Flame Class Rating: 0.45 mm (UL 94)
- UL Recognized, 94V-0 Flame Class Rating: 0.63 mm (UL 94)
- UL Recognized, 94-5VA Flame Class Rating: 2.99 mm (UL 94)
- UV-Light and Water Exposure/Immersion: F2 (UL 746C)
Injection Molding
- Drying Temperature: 120°C
- Drying Time: 3–4 hours
- Maximum Moisture Content: 0.02%
- Melt Temperature: 250–265°C
- Nozzle Temperature: 245–260°C
- Mold Temperature: 50–75°C
- Back Pressure: 0.3–0.7 MPa
- Screw Speed: 50–100 rpm
- Shot to Cylinder Size: 40–80%
- Vent Depth: 0.025–0.038 mm
Features & Benefits
Flame Retardant Excellence
Valox™ FR PBT 357M achieves UL 94V-0 flame rating at 0.63 mm, providing superior fire safety for critical electrical and electronic components. Its flame resistance reduces material failure risks in high-heat scenarios.
Robust Mechanical Strength
With a tensile stress of 48 MPa (ASTM D638) and flexural modulus of 2060 MPa (ASTM D790), this material delivers exceptional structural integrity, ideal for load-bearing applications such as connectors and enclosures.
Outstanding Impact Resistance
Designed with impact modifiers, FR PBT 357M boasts an Izod impact (unnotched) strength of 3200 J/m (ASTM D4812). It withstands mechanical shocks and stresses, making it suitable for high-risk environments.
Use & Application
- Electrical Connectors and Housings
- Circuit Breaker Components
- Power Distribution Units
- Switches and Relays
- Automotive Electrical Systems