Automobile Industry

The automotive industry is the largest application field for polyamides (nylon), accounting for approximately 30% of global nylon consumption. Dominant grades are PA6 and PA66, taking up over 90% of automotive nylon usage. Specialized types include PA610/612, PA11/12, PA46, PA1010/1212, which meet diverse demands for high strength, heat resistance, oil resistance, low water absorption and flexibility respectively.
1. PA6 (Nylon 6)

Core Properties: High toughness, excellent impact resistance and easy processing; relatively high water absorption (~1.8%) and ordinary dimensional stability; melting point: 220℃.
Automotive Applications
    Powertrain: Air filter housings, cooling fans & brackets, glass fiber reinforced valve covers
    Body & Interior: Door handles, wheel covers, fuel tank caps, instrument panel brackets, rearview mirror housings
    Electrical System: Fuse boxes, lamp housings, cable ties, connector shells
    Common Modifications: PA6+10-15%GF, PA6+20-25%GF, PA6+30%GF

2. PA66 (Nylon 66)

Core Properties: Superior strength and heat resistance to PA6, melting point 260℃; outstanding oil and chemical resistance; water absorption ~1.3%, higher processing temperature required.
Automotive Applications (Core material for engine compartment)
    Powertrain: Intake manifolds, cylinder head covers, oil pans, radiator water chambers, thermostat housings
    Chassis & Transmission: Brake booster housings, steering column components, gears, bearing retainers
    Electrical & Safety Parts: High-voltage connectors, ECU housings, airbag casings, bumper skeletons
    Common Modifications: PA66+30%GF, mineral-filled low-warpage PA66, PA6/66 copolymer

3. PA610

Core Properties: Low water absorption (~0.4%), stable dimension, excellent oil resistance and wear resistance, long-term service temperature 100-120℃; moderate mechanical strength.
Automotive Applications
    Fluid pipelines: Commercial vehicle air brake pipes, hydraulic brake hoses, fuel delivery pipes, vacuum tubes
    Chassis & Transmission: Door lock gears, seat adjustment racks, sunroof guide sliders, suspension buffer blocks
    Precision electrical parts: Engine bay connectors, ignition coil bobbins, fuse box supports

4. PA612

Core Properties: Ultra-low water absorption (~0.3%), excellent dimensional stability, good hydrolysis resistance and low-temperature toughness (-40℃), high flexibility; higher cost than PA610.
Automotive Applications
    Multi-layer fuel pipes: Inner oil-resistant layer & outer anti-aging layer matched with EVOH barrier layer
    Brake & hydraulic system: ABS hoses, clutch oil pipes, power steering pipes, pipe joints
    New energy vehicles: Battery cooling water pipes, high-voltage wire harness sheaths, charging pile connector housings

5. PA11

Core Properties: Bio-based material derived from castor oil, extremely low water absorption (~0.25%), excellent oil & hydrocarbon resistance, weather resistance and fatigue resistance, high flexibility; high cost.
Automotive Applications
    Fuel system: Single/multi-layer fuel pipes, fuel filler necks, carbon canister housings (resistant to ethanol gasoline)
    Brake system: High-pressure brake hoses, vacuum pipes, pneumatic pipelines
    Others: Corrugated pipes, protective sheaths, dust covers, flexible connecting components

6. PA12

Core Properties: The lowest water absorption (~0.2%), optimal dimensional stability, excellent low-temperature resistance (-50℃) and chemical resistance, good flexibility; cost-effective among long-chain nylons.
Automotive Applications (Most widely used specialty nylon)
    Fluid delivery: Fuel pipes, brake pipes, clutch pipes, vacuum booster pipes, NEV battery cooling pipes
    Interior & Exterior: Instrument panel frames, lever sheaths, door handles, grilles, flexible surface materials
    Electronic components: Cable sheaths, sensor housings, connectors, coil bobbins

7. PA46

Core Properties: Ultra-high heat resistance, melting point 295℃, withstand instantaneous temperature up to 300℃, high rigidity and creep resistance; expensive price.
Automotive Applications (Extreme high-temperature working conditions)
    Engine compartment: Turbocharger housings, exhaust system peripheral parts, high-temperature wire sheaths, ignition coil cores
    Transmission system: High-temperature gears, bearing retainers, timing belt pulleys, reinforced gearbox housings

8. PA1010 / PA1212

Core Properties: Low water absorption, good oil resistance, stable dimension and fine low-temperature toughness; independent domestic production with cost advantages.

Automotive Applications

    PA1010: Brake pipes, oil delivery hoses, corrugated pipes, instrument panels, bumpers, wiper components
    PA1212: Multi-layer fuel pipes, cooling water pipes, hose joints, electrical enclosures (ideal alternative to PA11 & PA12)

Quick Reference Table Material Selection Guidelines

    High-temperature & oil-exposed engine bay parts: Prioritize GF-reinforced PA66，choose PA46 for ultra-high temperature scenarios.
    Fluid pipeline components: PA610 for general use，PA612/PA12 for precision & low-temperature applications，PA11 for high-end products.
    Interior & appearance parts: Cost-effective PA6 or PA6/66 copolymer.
    New energy vehicle parts (low volatile & insulation required): PA12 for thermal management pipes, PA66 for high-voltage components.