How to Select an Injection Mould for Your Part and Production Needs

Selecting the right injection mould means balancing the part’s geometry and finish requirements with the expected production run. Longterm offers custom mould development from customer drawings or samples, with single- or multi-cavity layouts, optional hot runners, and a stated mould-life range of 50,000 to 1,000,000 shots. Its listed minimum order is one set, with delivery estimated at 20–35 days; confirm timing for the specific project.

Start with the Part and Production Plan

Share a part drawing or sample, then identify critical dimensions, surface appearance, and anticipated output. These details provide the basis for reviewing the mould structure, cavity count, material, and finish. Longterm lists SPI and VDI finishes, as well as optional hot-runner systems.

Estimate cumulative production and compare it with the specified mould-life range. A single-cavity or multi-cavity arrangement may be considered depending on the component and production plan. The available product information does not prescribe a particular cavity count or steel for a given volume, so these choices need to be settled during the design review.

Materials, Validation, and Quality Checks

Listed mould-base materials are S50C, P20, and 1.2738; listed mould steels are H13 and 718H. Confirm the appropriate material for the specific design and requirements with the supplier rather than assuming a direct relationship between a listed steel and a particular production volume.

Longterm reports incoming inspection, mould trial testing, dimensional inspection, and a full inspection before shipment. Its ISO 9001:2015 certification covers the design, manufacture, and sale of precision moulds, as well as the sale of plastic products.

Project examples include a handheld-device electronic housing mould and a double-shot overmoulded consumer electronics shell. The case descriptions mention feedback on dimensions and surface quality, alignment, and trial-sample stability, but do not publish specific tolerances or production quantities.

Specification Options at a Glance

Frequently Asked Questions

Can the mould be developed from a drawing or sample?

Yes. Longterm describes custom development based on drawings or samples supplied by the customer.

What mould life is specified?

The listed range is 50,000 to 1,000,000 shots. Confirm the suitable target for the part and planned production volume.

Which inspection steps are included in the product information?

The listed checks include incoming inspection, mould trials, dimensional inspection, and full inspection before shipment.

Prepare for a Design Review

Before requesting a quotation or design review, gather the part drawing or sample, expected production quantity, required surface finish, and target mould life. Then confirm the cavity layout, materials, hot-runner requirement, inspection plan, and delivery schedule for the project. Longterm lists OEM custom plastic injection moulding and mould development combined with injection-moulding production among its business models. For technical solutions or support, contact rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010 and serves international customers with mould design, tooling, precision machining, mould manufacturing, and parts production. The company reports a workforce of 50 and a 2,000-square-metre factory, producing more than 300 moulds each year; approximately 80% of its output is supplied to Europe and North America. Its ISO 9001:2015 certification applies to precision-mould design, manufacturing, and sales. Reported project sectors include consumer electronics, home appliances, and industrial components.