Sabic VALOX™ FR PBT 357U
Plastic Granules
Valox FR PBT 357U Flame Retardant Grade
Valox FR PBT 357U is an unreinforced, UV stabilized, flame-retardant, impact-modified thermoplastic. It offers superior chemical resistance and achieves a UL94 V-0 rating at just 0.64mm, making it an ideal, safe choice for demanding electrical components.
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 (xflow, 0.75-2.3 mm): 0.9–1.3% (SABIC method)
- Mold Shrinkage (xflow, 2.3-4.6 mm): 1.2–1.6% (SABIC method)
Mechanical Properties
- Tensile Modulus (50 mm/min): 2050 MPa (ASTM D638)
- Tensile Stress at Break (50 mm/min): 48 MPa (ASTM D638)
- Tensile Strain at Break (50 mm/min): 110% (ASTM D638)
- Flexural Stress at 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): 3204 J/m (ASTM D4812)
- Izod Impact, Notched (23°C): 534 J/m (ASTM D256)
- Gardner Impact Strength (23°C): 43 J (ASTM D3029)
Thermal Properties
- HDT (0.45 MPa, unannealed): 137°C (ASTM D648)
- HDT (1.82 MPa, unannealed): 98°C (ASTM D648)
- Coefficient of Thermal Expansion (CTE, -40°C to 40°C, flow): 9.18E-05 1/°C (ASTM E831)
- Coefficient of Thermal Expansion (CTE, 60°C to 138°C, flow): 1.24E-04 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: >1.2E+16 Ω·cm (ASTM D257)
- Dielectric Strength (in air, 3.2 mm): 18.5 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): 6 PLC Code (ASTM D495)
Flame Characteristics
- UL Recognized Flame Class Rating (94HB): 0.46 mm (UL 94)
- UL Recognized Flame Class Rating (94V-0): 0.64 mm (UL 94)
- UL Recognized Flame Class Rating (94-5VA): 3 mm (UL 94)
- Oxygen Index (LOI): 30% (ASTM D2863)
- UV-Light and Water Exposure/Immersion: F1 (UL 746C)
Injection Molding
- Drying Temperature: 120°C
- Drying Time: 3–4 hrs (Cumulative: 12 hrs)
- Maximum Moisture Content: 0.02%
- Melt Temperature: 250–265°C
- Nozzle Temperature: 245–260°C
- Front Zone Temperature: 250–265°C
- Middle Zone Temperature: 245–260°C
- Rear Zone Temperature: 240–255°C
- Mold Temperature: 50–75°C
- Back Pressure: 0.3–0.7 MPa
- Screw Speed: 50–100 rpm
- Vent Depth: 0.025–0.038 mm
Features & Benefits
Exceptional Flame Resistance
Valox FR PBT 357U meets UL94V-0 at 0.64mm and 5VA at 3mm thickness, ensuring reliable performance in high-risk environments. This makes it perfect for electrical enclosures and components requiring stringent fire safety compliance.
Outstanding Impact Strength
Engineered for durability, this resin features an Izod impact strength (unnotched, 23°C) of 3204 J/m (ASTM D4812), enabling it to withstand mechanical shocks and impacts in demanding industrial applications.
Excellent Dimensional Stability
With low mold shrinkage (0.8–1.1% in flow direction at 0.75–2.3 mm), Valox FR PBT 357U ensures precise part dimensions, making it a reliable choice for intricate designs and high-precision applications.
Use & Application
- Bobbins and Coil Formers
- Circuit Breakers and Switches
- Electrical Connectors and Enclosures
- Other Critical Electrical Insulation Components