1. Core Reasons for Recommendation

1.1 Mechanical Properties

• Tensile Strength: 160–190 MPa
• Tensile Modulus: 9–11 GPa
• Flexural Strength: 220–260 MPa
• Notched Impact Strength: 6–10 kJ/m²
• Molding Shrinkage: Flow direction 0.3–0.5%, transverse 0.8–1.2%
• Coefficient of Linear Thermal Expansion: 2.5–3.5 ×10⁻⁵ /°C

1.2 Thermal Properties

• Melting Point: 260–265 °C
• Heat Deflection Temperature (HDT, 1.82 MPa): 240–260 °C
• Long-Term Service Temperature: -40 °C to 150 °C
• Heat Aging Stability: Retention ≥ 85% after 1000 h at 130 °C

1.3 Electrical Safety

• Volume Resistivity: 10¹⁴–10¹⁵ Ω·cm
• Dielectric Strength: ≥ 25 kV/mm
• Flammability: HB; halogen-free flame retardant grade reaches UL94 V-0 (0.4 mm)
• CTI: ≥ 600 V

1.4 Environmental Resistance

• Weatherability: UV-stabilized for outdoor use
• Chemical Resistance: Resistant to coolants, oils, car wash chemicals
• Water Absorption: ~0.8% (23 °C, 24 h)

1.5 Processability & Cost

• MFR (275 °C/5 kg): 20–28 g/10 min
• Density: 1.36–1.38 g/cm³
• Cost-effective for mass production

2. Typical Datasheet (PA66 + 30% GF, Automotive Grade)

Property	Typical Value	Test Standard
Density	1.36–1.38 g/cm³	ISO 1183
Molding Shrinkage (3.2 mm)	Flow: 0.3–0.5%; Transverse: 0.8–1.2%	ISO 294-4
Water Absorption (23 °C, 24 h)	0.7–0.9%	ISO 62
Tensile Strength (Dry)	170–190 MPa	ISO 527
Tensile Modulus	9500–11000 MPa	ISO 527
Elongation at Break	3–5%	ISO 527
Flexural Strength	230–260 MPa	ISO 178
Flexural Modulus	10000–12000 MPa	ISO 178
Charpy Notched Impact (23 °C)	7–9 kJ/m²	ISO 179
HDT (1.82 MPa)	245–260 °C	ISO 75
Melting Point	260–265 °C	DSC
Coefficient of Linear Thermal Expansion	2.8–3.5 ×10⁻⁵ /°C	ISO 11359
Volume Resistivity	10¹⁴–10¹⁵ Ω·cm	IEC 60093
Flammability	HB / UL94 V-0 (0.4 mm)	UL94

3. Grade Selection for Charging Ports

1. Housings, brackets, structural componentsRecommend: Heat-stabilized PA66 + 30% GF
2. High-voltage / live parts (sockets, terminal holders)Recommend: Halogen-free flame-retardant PA66 + 30% GF (V-0)
3. Exterior parts (charging port covers)Recommend: UV-stabilized PA66 + 30% GF

4. Material Comparison

Material	Advantages	Disadvantages	Suitability
PA66 + 30% GF	Best balance of strength, heat resistance, insulation, cost	Possible fiber appearance	★★★★★ First choice
PA6 + 30% GF	Lower cost, better flow	Lower heat & aging resistance	★★★☆☆ Alternative
PA612 + 20% CF	Lightweight, low water absorption	High cost, conductive	★★★☆☆ Special use
PBT + 30% GF	Hydrolysis resistance	Lower heat & strength	★★★☆☆ Humid environments
Metal (Al/Zn)	Very high strength	Heavy, high cost, needs insulation	★★☆☆☆ Special structures

5. Processing Guidelines

• Drying: 100–120 °C for 4–6 h, moisture ≤ 0.05%
• Processing temperature: 260–280 °C
• Mold temperature: 80–100 °C
• Annealing (optional): 120–140 °C for 2–4 h to reduce stress

6. Summary

PA66 + 30% GF is the optimal material for EV charging ports, meeting automotive requirements for high strength, heat resistance, insulation, dimensional stability, weatherability and cost efficiency.