Polyurethane (PU / TPU) and Polycarbonate (PC) are the two most quoted options for medical plastic components in energy and renewables projects. Both are widely available, but they behave very differently once they are in service.
The notes below come from day to day production and export work with overseas buyers.
This category covers a family of products rather than a single item. In practice a buyer defines medical plastic components by three things: the base resin, the format or dimension, and the performance or certification level it has to meet. Typical options in this category include single use and reusable designs; gamma, ETO and steam sterilisation grades; cleanroom packed. Materials most often specified are Polyvinyl Chloride, Polyurethane, Polypropylene, Polyether Ether Ketone, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the energy and renewables sector the decision is usually driven by UV durability and flame retardancy, with electrical insulation as a secondary requirement. Typical end uses include insulating barriers, solar junction boxes, cable jacketing.
The table below summarises the values that usually decide the material choice.
| Material | Density | Tensile strength | Service temperature |
|---|---|---|---|
| Polypropylene | 0.90-0.91 g/cm³ | 25-40 MPa | -10°C to 100°C |
| Thermoplastic Elastomer | 0.90-1.30 g/cm³ | 5-30 MPa | -40°C to 100°C |
| Polycarbonate | 1.20 g/cm³ | 55-70 MPa | -40°C to 120°C |
Polyurethane is frequently the default selection here: TPU bridges the gap between rubber and plastic: elastic, yet weldable and recyclable.
Polyurethane grades offer outstanding abrasion and tear resistance, while Polycarbonate brings outstanding impact strength (250x glass). For energy and renewables service the difference shows up in creep and in the long term behaviour under load.
The practical decision usually comes down to the service environment: temperature, chemical exposure and expected lifetime.
Beyond the base resin, most suppliers offer UV stabilised, food contact, flame retardant, anti-static and recycled content versions of the same product. Ask which additive package is included, because it is often the difference between a part that lasts three years and one that lasts ten.
Processing method drives both cost and performance, so it should be fixed early in the design.
Secondary operations such as printing, welding, machining and assembly are often cheaper to do in the same factory, and they reduce the risk of mismatch between components.
Work through these points in order and most specification mistakes disappear.
Send this list to your supplier with the drawing and you will receive comparable quotations from every factory you contact.
Standard production tolerance follows the relevant ISO or DIN tolerance class for the process; tighter tolerances are possible after machining or grinding, but they add cost. Define the tolerance only on the functional dimensions.
Yes. Standard samples are normally free of charge and shipped within three working days; custom samples are charged at cost and credited against the first production order.
For standard sizes and colours the minimum is usually one pallet or one production run; for custom tooling the economic minimum depends on the tooling cost amortised over the expected volume. Send us your annual volume and we will calculate the break even point.
Colour is controlled with a masterbatch reference approved by the customer, and every production lot is checked against the approved sample under standard lighting before shipment.
A new tool typically takes 25 to 45 days depending on cavity count and complexity, followed by T1 samples within one week. Existing tools can usually start production within 10 to 15 days of order confirmation.
If you are planning a new energy and renewables project, send us your drawing, annual volume and target properties, and we will come back with a material proposal, a tooling plan and a budget quotation.
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