PC/PBT Alloy (Polycarbonate / PBT Blend)

Chemical Resistant & Flame Retardant Plastic for Automotive and Electrical Applications

PC/PBT Alloy is engineered for environments where PC/ABS reaches its performance limits. By blending polycarbonate with PBT, this alloy delivers excellent resistance to chemicals, oils, fuels, and cleaning agents, while maintaining strong impact resistance—especially at low temperatures.

Compared with PC/ABS, PC/PBT offers better chemical stability, lower moisture sensitivity, and improved dimensional stability, making it a preferred choice for demanding automotive and electrical applications.

 Alloy Structure & Material Design

PC/PBT is a multiphase polymer alloy where PC contributes toughness and heat resistance, while PBT provides chemical resistance and crystallinity.

Material Composition Overview

• Polymer System: Polycarbonate + PBT

• Performance Focus: Chemical resistance & impact stability

• Flame Retardant Options: HB / UL94 V0

• Reinforcement: None (unfilled)

• Optional Additives:

  • Heat stabilizer

  • Hydrolysis stabilizer

  • UV stabilizer

• Color Options: Natural, black, customized

This alloy system is designed for long-term stability in harsh environments.

Core Advantages: Chemical Resistance Meets Impact Strength

Engineering Advantages

• Excellent Chemical Resistance
  Resistant to oils, fuels, greases, and automotive fluids.

• Superior Low-Temperature Impact Performance
  Maintains toughness in cold environments.

• Good Heat Resistance
  Suitable for automotive and electrical components.

• Low Moisture Sensitivity
  Better dimensional stability than PC/ABS.

Manufacturing & Commercial Advantages

• Stable injection molding behavior

• Lower warpage than PC-based materials

• Consistent flame retardant performance

• OEM-approved for automotive use

Flame Retardant Grades: HB vs UL94 V0

HB Grade

• Basic flame resistance

• Better impact retention

• Cost-effective option

• Suitable for non-safety-critical parts

UL94 V0 Grade

• Self-extinguishing behavior

• Required for electrical safety components

• Halogen-free options available

• Slightly reduced impact vs HB

Typical Application Areas

Automotive

• Exterior trim components

• Sensor housings

• Connector shells

Electrical & Electronics

• Electrical enclosures

• Relay housings

• Industrial connectors

Industrial Equipment

• Chemical-exposed housings

• Outdoor electrical components

Processing Performance & Injection Molding Guidelines

PC/PBT requires proper temperature control to ensure phase stability and surface quality.

• Melt Temperature: 250–280 °C

• Mold Temperature: 80–110 °C

• Drying: 110–120 °C for 3–4 hours

• Injection Speed: Medium

• Shrinkage: 0.3–0.6%

Proper drying is critical to maintain impact and flame performance.

Technical Specification – PC/PBT Alloy (HB / V0)

OEM / ODM Customization Capabilities

• HB / UL94 V0 flame ratings

• Enhanced low-temperature impact grades

• Hydrolysis-resistant formulations

• UV-stabilized outdoor versions

FAQ

Q1: Why choose PC/PBT instead of PC/ABS?
PC/PBT offers superior chemical resistance and low-temperature impact stability.

Q2: Is PC/PBT suitable for automotive exterior parts?
Yes, it performs well under chemical exposure and temperature variation.

Q3: What is the difference between HB and V0 grades?
HB offers basic flame resistance, while V0 provides self-extinguishing behavior for safety applications.

Q4: Does PC/PBT absorb moisture?
It has lower moisture sensitivity compared to PC-based materials.

Q5: Can PC/PBT be customized for OEM use?
Yes, flame performance and environmental resistance can be tailored.