Nylon is the material engineers specify when a part has to move. Gears, cams, bearings and latches run quieter and need no lubrication in PA, and glass-filled grades push tensile strength past 150 MPa with heat resistance to 200 °C. The price of that performance is moisture — nylon absorbs water, grows dimensionally, and has to be dried and re-conditioned deliberately.
Typical values for standard moulding grades. Exact figures depend on the specific compound or grade — confirm against your drawing before quoting.
Key properties
| プロパティ | Typical value |
|---|---|
| 密度 | 1.13 – 1.15 g/cm³ (unfilled) |
| Tensile strength | 70 – 85 MPa (dry, unfilled) |
| Flexural modulus | 2.5 – 3.0 GPa |
| HDT at 1.8 MPa | 65 – 90 °C unfilled / 200 – 250 °C GF30 |
| Mould shrinkage | 0.8 – 1.5 % unfilled / 0.3 – 0.5 % GF30 |
| Water absorption (24 h) | 1.0 – 2.8 % |
Values are typical for unfilled moulding grades at 23 °C unless stated. Glass-filled and specialty grades differ.
Typical applications
- Gears, cams and sliding mechanisms
- Bearings and bushings
- Automotive under-hood brackets and covers
- Power tool housings and handles
- Cable ties, clips and fasteners
Processing notes
- Dry 4 h at 80 – 100 °C. Moisture in nylon depolymerises the melt and shows up as brittle parts, not as visible defects.
- Melt 240 – 290 °C, mould 70 – 100 °C. A hot mould is what gives nylon its toughness — a cold tool produces parts that snap.
- Glass-filled grades are abrasive. Use hardened steel and expect gate wear on long runs; we specify tool steel accordingly when the grade is confirmed.
- Dimensionally, unfilled PA6 can grow 1.5 % as it absorbs equilibrium moisture. Quote critical dimensions in the conditioned state, not dry as moulded.
Frequently asked questions
PA6 or PA66?
PA66 is stiffer and holds heat better; PA6 is tougher, easier to process and absorbs moisture faster. For gears and general mechanism parts PA66 usually wins; for parts that need impact at low temperature, PA6 is often the better choice.
How much glass fill do you recommend?
30 % is the default for structural parts and gives the best balance of stiffness, impact and cost. Go to 50 % only when the load path genuinely needs it — surface finish and weld-line strength both suffer.
Related materials
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