PA66 INVISTA U4820L
PA66 INVISTA U4820L Resin
Material Introduction: PA66 INVISTA U4820L is a high‑flow, unreinforced general‑purpose injection‑molding PA66 resin. Its core advantages are excellent processing flowability, well‑balanced mechanical strength and toughness, superior electrical insulation, UL94 V‑2 flame‑retardant rating, good chemical resistance and long‑term heat resistance.
Main Applications
Automotive industry: Carbon canisters, wire harness components, fuse boxes and other parts.
Electronic‑electrical industry: Cable ties, connectors, terminal blocks, switches, sockets and electrical components.
Industrial applications: Cable ties, fasteners and general‑purpose mechanical parts.
Consumer goods industry: Battery sealing gaskets, lighters, spray valve spools, kitchenware and other articles.
Performance Parameters
| Performance Category | Test Condition / Standard | Unit | Typical Value | Remarks & Interpretation |
|---|---|---|---|---|
| Physical Properties | ||||
| Density | ISO 1183 | g/cm³ | 1.14 | Unreinforced PA66 grade |
| Water Absorption (24hr,23℃) | ISO 62 | % | 1.4 | ‑ |
| Equilibrium Water Absorption (23℃,50%RH) | ISO 62 | % | 2.7 | Moisture‑sensitive polyamide |
| Molding Shrinkage (flow direction,2.00 mm) | ISO 294‑4 | % | 1.9 | ‑ |
| Molding Shrinkage (cross‑flow direction,2.00 mm) | ISO 294‑4 | % | 1.8 | ‑ |
| Mechanical Properties | ||||
| Tensile Strength at Yield | ISO 527‑2 | MPa | 82.0 | ‑ |
| Elongation at Break | ISO 527‑2 | % | 50 | ‑ |
| Tensile Modulus | ISO 527‑2 | MPa | 3200 | ‑ |
| Flexural Strength | ISO 178 | MPa | 95.0 | ‑ |
| Flexural Modulus | ISO 178 | MPa | 2900 | ‑ |
| Charpy Notched Impact Strength (23℃) | ISO 179/1eA | kJ/m² | 5.5 | ‑ |
| Charpy Notched Impact Strength (-30℃) | ISO 179/1eA | kJ/m² | 4.3 | Low‑temperature toughness |
| Charpy Un‑notched Impact Strength (23℃) | ISO 179/1eU | kJ/m² | NB (No Break) | ‑ |
| Charpy Un‑notched Impact Strength (-30℃) | ISO 179/1eU | kJ/m² | 310 | ‑ |
| Izod Notched Impact Strength (23℃) | ISO 180/1A | kJ/m² | 5.4 | ‑ |
| Thermal Properties | ||||
| HDT @1.8 MPa | ISO 75‑2/A | °C | 66.0 | ‑ |
| HDT @0.45 MPa | ISO 75‑2/B | °C | 204 | ‑ |
| Melting Point | ISO 11357‑3 | °C | 261 | ‑ |
| Coefficient of Linear Thermal Expansion (flow) | ISO 11359‑2 | cm/cm/°C | 8.0E‑5 | ‑ |
| Coefficient of Linear Thermal Expansion (cross‑flow) | ISO 11359‑2 | cm/cm/°C | 8.0E‑5 | Isotropic for unreinforced grade |
| Electrical Properties | ||||
| Volume Resistivity | IEC 60093 | Ω·cm | 4.0E+14 | ‑ |
| Surface Resistivity | IEC 60093 | Ω | 3.0E+14 | ‑ |
| Dielectric Strength | IEC 60243‑1 | kV/mm | 32 | ‑ |
| Comparative Tracking Index (CTI) | IEC 60112 | V | 600 | High tracking resistance |
| Flammability | ||||
| UL94 Rating (0.40 mm / 0.71 mm) | ‑ | ‑ | V‑2 | ‑ |
| GWFI | IEC 60695‑2‑12 | °C | 750(0.8mm), 800(1.5mm), 960(3.0mm) | ‑ |
| HWI | IEC 60695‑2‑13 | °C | 850(0.8mm), 700(1.5mm/3.0mm) | ‑ |
Injection Molding Parameters
| Processing Item | Recommended Range / Condition | Notes & Explanations |
|---|---|---|
| Drying Treatment | Hot‑air drying:80‑85 ℃ for 2‑4 h; extend drying time or adopt vacuum drying under high‑humidity conditions; target moisture content＜0.2% | Critical operation. PA66 is prone to moisture‑induced hydrolysis. Excess moisture causes bubbles, silver streaks and severe mechanical‑property loss. Use immediately after drying or seal and keep warm properly. |
| Melt Temperature | 260‑290 ℃ | Fine‑tune per equipment and part geometry. Avoid temperature＞300 ℃ or long‑residence‑time to prevent degradation and discoloration. |
| Mold Temperature | 60‑80 ℃ | Proper mold temperature delivers good crystallinity, surface gloss and mechanical performance. |
| Injection Pressure | Adjust per product and mold design | Sufficient pressure guarantees compact parts despite high‑flow characteristic of U4820L. |
| Injection Speed | Medium‑high speed | Relatively fast speed takes advantage of high flowability; good mold venting is required. |
| Back Pressure | 0.5‑1.0 MPa (5‑10 kgf/cm²) | Moderate back‑pressure homogenizes melt and improves venting; excessive back‑pressure reduces plasticizing efficiency and may induce overheating. |
| Screw Speed | Medium speed (50‑120 rpm) | Avoid excessive shear‑heat generation. |
| Runner & Gate | Avoid undersized runner and gate dimensions | Nylon solidifies rapidly; gate location & size are critical for filling. High‑flow U4820L permits relatively small‑size gates. |
Disclaimer: All above data is for reference only.
