In home appliance projects, plastic gears, bearings and wear parts is only acceptable when the paperwork is right. This article maps the standards, test methods and documents you should ask for.
Use it as a working checklist when you write your next enquiry.
This category covers a family of products rather than a single item. In practice a buyer defines plastic gears, bearings and wear parts 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 plain and self-lubricating grades; module 0.3 to 8; bore tolerance H7 to H9. Materials most often specified are Polyamide, UHMWPE, Glass Filled Nylon, Polytetrafluoroethylene, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.
In the home appliance sector the decision is usually driven by heat resistance and noise control, with colour consistency as a secondary requirement. Typical end uses include refrigerator liners, washer tubs, kettle bodies.
The table below summarises the values that usually decide the material choice.
| Material | Density | Tensile strength | Service temperature |
|---|---|---|---|
| Glass Filled Nylon | 1.36-1.38 g/cm³ | 130-190 MPa | -40°C to 150°C |
| UHMWPE | 0.93-0.94 g/cm³ | 30-45 MPa | -150°C to 80°C |
| Polyoxymethylene | 1.41 g/cm³ | 60-70 MPa | -40°C to 100°C |
Polyoxymethylene is frequently the default selection here: POM is the standard replacement for small metal parts that must hold tight tolerances.
Paperwork matters as much as the part itself in regulated markets.
Ask the supplier to state the standard number, the test method and the result on the certificate. A test report without a standard reference is difficult to defend during an audit.
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.
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.
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.
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.
We can provide ISO 9001 quality system documentation, material certificates, RoHS and REACH statements, and where applicable food contact, flame retardancy or drinking water approvals. Tell us your target market and we will match the document set.
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.
Share your specification and quantity with us and we will recommend the most cost effective material, tooling route and packing method for your market.
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