PBT-Sabic Valox 420
Sustaining high mechanical torque and exceptional dimensional stability under high-voltage EV and under-the-hood thermal loads requires a heavy-duty composite, which SABIC's Valox 420 delivers through its 30% glass fiber reinforced polybutylene terephthalate matrix. Boasting a high density of 1.53 g/cm³ and a heat deflection temperature (HDT) of 207°C, this semi-crystalline grade is globally specified for electric motor components, spotlight housings, and heavy-duty connectors. Jucheng Precision, operating under IATF 16949 and ISO 9001 frameworks, specializes in molding Valox 420. Utilizing 5-axis CNC-machined S136 tool steel cores hardened to 50 HRC, we control its anisotropic shrinkage (0.3%-1.0%) to prevent warpage, delivering flash-free structural parts verified by Zeiss CMM.
Valox 420 Mechanical Modulus & Thermal Tolerance Grid
VALOX™ Resin 420 is a 30% glass fiber reinforced, un-lubricated semi-crystalline PBT injection molding grade, certified to deliver outstanding strength, stiffness, and heat resistance under ASTM/ISO standards:
| Mechanical / Thermal Metric | Typical Value (ASTM/ISO) | Component Design Benefit |
|---|---|---|
| Tensile Strength at Break | 119 MPa (ASTM D638) | Provides immense structural load-bearing capacity, substituting die-cast metal brackets and casings with lighter weight. |
| Flexural Modulus | 7,580 MPa (ASTM D790) | Delivers high-stiffness, unbending structural integrity for electric motor casings, spotlights, and dynamic pump impellers. |
| Heat Deflection (HDT) | 207 °C (DAM @ 1.82 MPa) | Retains mechanical properties and shape under continuous thermal load in high-heat engine environments (HDT 215°C at 0.45 MPa). |
Heavy-Duty Process & Alignment Suitability for Valox 420
With its rapid crystallization and low melt viscosity of the base PBT, Valox 420 fills complex structural cavities consistently:
| Molding Process | Grade Adaptation & Engineering Focus |
|---|---|
| Precision Connector Assemblies | Excellent. Highly suitable for multi-pin automotive electrical blocks, sensor plugs, high-voltage terminals, and heavy-duty coil housings. |
| Electric Motor & Bobbin Components | Excellent. High tensile modulus prevents part deflection under tight copper winding tension on multi-slot bobbins and end bells. |
| Dynamic Spotlight Enclosures | Excellent. High continuous heat resistance and dimensional integrity are ideal for molding lighting reflectors, spotlight housings, and appliance handles. |
PBT-SABIC Valox 420 Tooling & Fiber Orientation Blueprint
Molding a 30% glass-fiber filled semi-crystalline resin like Valox 420 requires strict moisture control and optimized gating to prevent abrasive tool wear and warpage:
Controlling Abrasive Tool Wear
30% short glass fibers act as an abrasive sanding medium under high injection speeds. Jucheng’s tooling division prevents cavity erosion by constructing molds with premium S136 stainless tool steel hardened to 48–52 HRC and machined on our 5-axis CNCs, ensuring long-term parting line precision.
Managing Anisotropic Shrinkage
Valox 420 shrinks much less along the flow (0.30%–0.50%) than perpendicular to it (0.40%–0.80%). We use Moldflow simulation during our free DFM review to balance gate locations, aligning glass fibers uniformly to prevent component warping and out-of-tolerance dimensions.
Key Application Fields for PBT-Sabic Valox 420
- Automotive Powertrains & Lighting (IATF 16949): High-voltage EV battery connectors, ignition coil bobbins, thermostat sensor housings, headlamp bezel assemblies, and electric water pump housings.
- Electrical Components & Motors: Heavy-duty industrial relays, terminal blocks, electric motor end bells, smart-meter connector grids, and coil bobbins.
- Industrial Appliances & Lighting: Heavy-duty appliance handles, outdoor spotlight housings, high-temperature indicator bezels, and structural chemical valve housings.
Properties
| Density | 1.53 g/cm³ |
| Tensile Strength at Break | 119 MPa |
| Tensile Elongation at Break | 3.0 % |
| Flexural Strength | 189 MPa |
| Flexural Modulus | 7,580 MPa |
| Izod Notched Impact Strength (23°C) | 85 J/m |
| Izod Unnotched Impact Strength (23°C) | 801 J/m |
| Rockwell Hardness (R-Scale) | 118 - |
| Melting Temperature | 223 °C |
| Heat Deflection Temperature (HDT @ 0.45 MPa) | 215 °C |
| Heat Deflection Temperature (HDT @ 1.82 MPa) | 207 °C |
| Linear Mold Shrinkage (Flow Direction) | 0.30 - 0.80 % |
| Linear Mold Shrinkage (Cross Direction) | 0.40 - 1.00 % |
| Volume Resistivity | 3.2E+16 Ohm-cm |
| Maximum Part Size | 1000 x 800 mm |
| Minimum Part Size | 1 x 1 mm |