PVC is cheap, inherently flame retardant and resistant to most inorganic chemicals, which keeps it in pipe fittings, electrical boxes and medical tubing connectors despite environmental pressure on the material. It is also the most process-sensitive plastic we run: overheated PVC releases hydrogen chloride, which attacks the tool, the machine and the operator. Corrosion-resistant hardware and strict temperature control are prerequisites, not precautions.
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 | 1.38 – 1.45 g/cm³ (rigid) |
| Tensile strength | 40 – 55 MPa (rigid) |
| Flexural modulus | 2.4 – 3.0 GPa |
| HDT at 1.8 MPa | 60 – 70 °C |
| Mould shrinkage | 0.2 – 0.6 % |
| Flammability | Self-extinguishing, UL 94 V-0 achievable |
Values are typical for unfilled moulding grades at 23 °C unless stated. Glass-filled and specialty grades differ.
Typical applications
- Pipe fittings, valves and drainage components
- Electrical conduit boxes and cable management
- Medical tubing connectors and fluid fittings
- Window profiles and construction hardware
- Flexible gaskets and boot seals in plasticised grades
Processing notes
- Melt 170 – 200 °C. Every 10 °C above the window shortens the safety margin; use a hot-runner controller with tight deviation alarms.
- The tool and screw must be corrosion resistant — chrome or stainless. Bare steel will pit within months of running PVC.
- Residence time is the real risk. Size the shot so the melt does not sit in the barrel, and purge thoroughly at every stop.
- Plasticised grades migrate. If the part touches food, skin or a painted surface, specify a non-migrating plasticiser and confirm with the grade supplier.
Frequently asked questions
Is PVC still acceptable for medical devices?
Yes for many applications, but the market has shifted toward DEHP-free plasticisers and, in some segments, away from PVC entirely. Tell us the regulatory market and we will specify a compliant grade or propose a substitute.
Can you mould flexible PVC?
Yes, in plasticised grades from about 50 Shore A upward. Flexible PVC needs more generous runners and lower packing than rigid, and the shrinkage differs, so it is quoted as a separate process.
Related materials
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Upload a 3D model or a 2D drawing and we will come back with a DFM review, a tooling cost and a piece price — usually within two working days.
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