PA66 DUPONT 42A Resin
PA66 DUPONT 42A Resin
Material Introduction: PA66 DUPONT 42A (USA DuPont) is a high‑viscosity, unreinforced general‑purpose injection‑molding PA66 resin. Its core advantages include suitability for thick‑wall parts, good mechanical strength, wear resistance, self‑lubricating property and ultrasonic‑weldable performance. Its inherent water‑absorption property will affect dimensional stability and partial performances (large performance difference between dry and conditioned state); strict drying is mandatory before processing.
Main Applications
Automotive industry: Automotive gear‑shift components and machine‑processed stock raw materials.
Mechanical parts: Bearings, gears, pulleys, pump impellers, high‑pressure sealing rings, gaskets, valve seats, bushings, oil pipelines and oil reservoirs.
Electronic‑electrical industry: Electrical insulating parts such as electric coils and cable joints.
Performance Parameters
| Performance Category | Test Condition / Standard | Unit | Typical Value | Remarks & Interpretation |
|---|---|---|---|---|
| Physical Properties | ||||
| Density | ASTM D792 / ISO 1183 | g/cm³ | 1.14 | Unreinforced high‑viscosity grade |
| Water Absorption (24hr) | ASTM D570 | % | 1.2 | ‑ |
| Equilibrium Water Absorption (50% RH) | Similar to ISO 62 | % | 2.6 | ‑ |
| Water Absorption (Saturated) | ASTM D570 / Similar to ISO 62 | % | 8.5 | ‑ |
| Molding Shrinkage‑Flow Direction | ISO 294‑4 | cm/cm | 0.014‑0.015 | Specimen:2.0‑3.2 mm thickness |
| Mechanical Properties | ||||
| Tensile Yield Strength (dry) | ASTM D638 / ISO 527 | MPa | 83(ISO 527) / 85(ASTM D638) | Dry‑as‑molded (DAM) |
| Tensile Yield Strength (50% RH) | ASTM D638 / ISO 527 | MPa | 55(ISO 527) / 59(ASTM D638) | 50% RH conditioned state |
| Elongation at Break (dry) | ASTM D638 | % | 5 / 90 | Results vary with test method & condition |
| Elongation at Break (50% RH) | ASTM D638 | % | 30 | ‑ |
| Flexural Modulus (dry) | ASTM D790 / ISO 178 | MPa | 2830(ASTM D790) / 2800(ISO 178) | Dry‑as‑molded (DAM) |
| Flexural Modulus (50% RH) | ASTM D790 / ISO 178 | MPa | 1210(ASTM D790) / 1070(ISO 178) | 50% RH conditioned state |
| Notched Impact Strength (dry) | ASTM D256 / ISO 180/1A | J/m / kJ/m² | 64 J/m / 6 kJ/m² | Dry‑as‑molded (DAM) |
| Notched Impact Strength (50% RH) | ASTM D256 | J/m | 133 / 113 | Estimated value, higher toughness after moisture conditioning |
| Rockwell Hardness (dry) | ASTM D785 | ‑ | R121, M80 | Dry‑as‑molded (DAM) |
| Thermal Properties | ||||
| Melting Point | ASTM D3418 / ISO 11357 | ℃ | 262‑263 | ‑ |
| HDT @1.8 MPa | ASTM D648 / ISO 75 | ℃ | 65 / 70 | Slight deviation between different standards |
| HDT @0.45 MPa (66 psi) | ASTM D648 | ℃ | 200 / 210 | ‑ |
| Linear Thermal Expansion Coefficient | ASTM E831 / ISO 11359 | cm/cm/℃ | 1.0×10⁻⁴ | ‑ |
| Electrical Properties | ||||
| Volume Resistivity (dry) | IEC 60093 | Ω·cm | 10¹³ | ‑ |
| Volume Resistivity (50% RH) | IEC 60093 | Ω·cm | 10¹¹ | ‑ |
| Dielectric Constant (100Hz, dry) | IEC 60250 | ‑ | 4.3 | ‑ |
| Dielectric Constant (100Hz, 50% RH) | IEC 60250 | ‑ | 10.03 | ‑ |
| Flammability | ||||
| UL94 Rating | 1.5 mm / 0.71 mm / 3.0 mm | ‑ | HB | ‑ |
| Limiting Oxygen Index (LOI) | ISO 4589 | % | 28 | ‑ |
Injection Molding Parameters
| Processing Item | Recommended Range / Condition | Notes & Explanations |
|---|---|---|
| Drying Treatment | Hot‑air drying at 80‑85 ℃ for at least 4‑6 h; vacuum‑dry at 100‑105 ℃ for over 6‑8 h under high‑humidity conditions. | Critical operation. Control moisture content ≤0.2% (max drying loss 0.05%) to avoid hydrolysis‑induced bubbles, silver streaks and mechanical‑property deterioration. Use immediately after drying or seal and keep warm properly. |
| Melt Temperature | 280‑300 ℃. | Adjust according to equipment and products. Avoid temperature＞310 ℃ or long residence‑time to prevent thermal degradation. PA66 melting point:262℃. |
| Mold Temperature | 50‑90 ℃ for most parts, 80 ℃ recommended. | Higher mold temperature improves crystallinity, surface gloss, mechanical performance and dimensional stability; lower mold temperature shortens cycle time. |
| Injection Pressure | Adjust per product & mold design. | High‑viscosity grade may require higher injection pressure, especially for thick‑wall articles. |
| Injection Speed | Medium‑low speed. | High viscosity brings large flow resistance; excessive speed shall be avoided to prevent excessive shear heat and internal stress. |
| Back Pressure | 0.5‑0.7 MPa (approx.5‑7 kgf/cm²). | Moderate back‑pressure homogenizes melt and facilitates venting; excessive back‑pressure reduces plasticizing efficiency and may cause overheating. |
| Screw Speed | Medium‑low speed. | Avoid excessive shear force to prevent material thermal degradation. |
| Runner & Gate | Enlarge gate size for high‑viscosity feature. | Short solidification time of PA66, gate location and dimension are critical for filling. |
| Shutdown Notice | Purge barrel with PE / PP with good thermal stability at production pause or shutdown to prevent carbonization of residual PA66; turn off heating system for long‑term shutdown. | ‑ |
| Molding Shrinkage | 1.4%‑1.5% (estimated from 0.014‑0.015 cm/cm). | Typical value, subject to process and product design. |
Disclaimer: All above data is for reference only.
