Key Properties and Advantages

1 Physical Properties

• Appearance: Transparent amber color, non-toxic, odorless.

• Dimensional Stability: Excellent dimensional precision with low and stable molding shrinkage.

• Unreinforced PEI: 0.5% – 0.7%

• Glass fiber reinforced: 0.1% – 0.3%

• Water absorption: 0.16%

• Low Thermal Expansion: Similar to metals, ideal for high-precision components.

2 Mechanical Properties

• High Strength and Modulus:

• Tensile strength: up to 15,000 psi

• Retains 6,000 psi even at 190°C

• Flexural modulus (20% GF): up to 1,700,000 psi

• Toughness: Elongation at break 60% – 80%, suitable for snap-fit and structural designs.

• Excellent Creep & Fatigue Resistance

• Impact Strength: Sensitive to notches, but proper design ensures high impact performance.

  
  

3 Thermal Properties

• Long-term service temperature: 150°C – 170°C

• Heat deflection temperature (HDT): up to 220°C

• Glass transition temperature (Tg): 217°C

• Short-term resistance: Withstands 180°C – 200°C without degradation

• Thermal stability: Maintains strength, rigidity, and wear resistance under high heat.

  
  

4 Flame Retardancy

• Natural flame resistance—no additives required

• Oxygen Index: 47%

• Flammability Rating: UL94 V-0

• Emits low smoke and toxicity.

5 Chemical Resistance

• Excellent resistance to hydrocarbons, alcohols, oils, halogenated solvents, inorganic acids, and short-term weak alkalis.

• Resistant to hot water and hydrolysis: retains 85% tensile strength after 104 hours in boiling water.

• Limited alkali resistance and dissolves in some solvents at temperatures ≥150°C.

  
  

  
  

6 Electrical Properties

• Stable dielectric constant, low dielectric loss, and high dielectric strength across a wide temperature and frequency range.

• Ideal for high-performance electronic and electrical insulation components.

  
  

7 Radiation Resistance

• Excellent UV and gamma radiation resistance.

• Tensile strength remains at 94% after exposure to 400-megarad cobalt irradiation.

  
  

8 Processing Performance

• Suitable for injection molding, extrusion, blow molding, and 3D printing.

• Must be pre-dried before processing due to moisture absorption.

  
  

Main Applications of PEI Material

1. Automotive Industry

Used for high-temperature and structural components such as:

• Engine parts, ignition components, temperature control housings

• Gears, bearings, solenoid valve bodies

• Headlight reflectors, lamp holders, electrical connectors

• Vacuum pump impellers, oil-resistant components

2. Optical Communication

PEI is widely used in:

• Fiber optic connectors

• Optical modules

• Precision optical components

3. Aerospace

Ideal for:

• Aircraft interior panels and components

• Engine parts and jet propulsion systems

• Lightweight EMI-shielding structures

  
  

4. Electronics & Electrical

Used for:

• Connectors, relays, switches, PCB components

• Precision molded optical fiber devices

• High-performance electric motor components

Replaces metals in optical fiber connectors for better performance and reduced cost.

5. Medical Industry

Suitable for:

• Surgical instruments

• Medical monitoring device housings

• Sterilizable reusable and disposable medical components