Discover Our PA6.6
Explore Our PA6.6 — higher heat and mechanical performance with excellent wear and chemical resistance, a great option for demanding engineering parts.
1. High mechanical strength and stiffness
PA66 is one of the strongest and most rigid engineering nylons, delivering excellent tensile strength, flexural modulus, and creep resistance. Unreinforced PA66 typically provides tensile strength of 75–90 MPa and a flexural modulus of approximately 2,800–3,300 MPa. When reinforced with 30% glass fiber, these values rise significantly — tensile strength often reaches 180–210 MPa and modulus climbs to 9,000–11,000 MPa. This outstanding load-bearing capability, combined with good dimensional stability under stress, makes PA66 ideal for demanding structural components such as gears, sprockets, bearings, bushings, brackets, valve housings, and automotive structural parts. Its high stiffness also helps minimize deflection in precision assemblies.
2. Superior Heat Resistance
PA66 stands out with a melting point of approximately 260–265°C and a heat deflection temperature (HDT) that is notably higher than PA6, especially in reinforced grades (often 240–260°C at 1.8 MPa for 30% GF). It supports continuous service temperatures of 120–150°C (and short-term peaks up to 180–200°C or higher in stabilized grades). This thermal performance allows PA66 to retain mechanical properties, stiffness, and strength in elevated-temperature environments where PA6 would soften or lose performance. Typical uses include under-the-hood automotive components (engine covers, intake manifolds, radiator end tanks, cylinder head covers), high-temperature electrical connectors, switches, and industrial parts near engines or hot machinery.
3. Excellent wear and fatigue performance
PA66 offers a low coefficient of friction (typically 0.2–0.4 against steel), outstanding abrasion resistance, and superior fatigue endurance under cyclic loading. Its molecular structure provides excellent resilience, allowing components to withstand millions of stress cycles with minimal wear or crack initiation. These attributes make it highly suitable for dynamic applications such as gears, cams, valve actuators, conveyor chains and rollers, pump impellers, bearings, and sliding mechanisms. In many cases, PA66 outperforms PA6 in long-term fatigue life and maintains tighter tolerances in high-speed or high-load moving parts, reducing maintenance needs and extending service life.
4. Good chemical and oil resistance with lower moisture uptake than PA6
PA66 provides robust resistance to oils, greases, fuels (gasoline, diesel), hydraulic fluids, and many industrial chemicals and solvents. It generally absorbs less moisture than PA6 — equilibrium moisture content is typically around 2.0–2.5% at 50% relative humidity (versus ~2.5–3.5% for PA6). This lower hygroscopicity results in better dimensional stability, less swelling, and more consistent mechanical and electrical properties in humid or varying environmental conditions. Consequently, PA66 is preferred for applications requiring tight tolerances or consistent performance outdoors, in automotive fluid environments, or in electrical/electronic parts where moisture could affect insulation or fit.
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We understand the key concerns when selecting PA66: high temperature performance, mechanical strength and stiffness, wear and fatigue resistance, chemical and oil resistance, and dimensional stability under moisture and load. Our PA66 grades are precisely formulated to excel in these areas, delivering reliable processing for injection molding or extrusion, sustained structural integrity at elevated temperatures, exceptional wear and impact performance, and robust resistance to oils and industrial chemicals. Trust CW Plastic to supply PA66 materials engineered to meet your most demanding performance and longevity requirements with confidence.
