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

The right injection mould should suit both the geometry of your part and the number of units you plan to make. Compare cavity layout, tooling materials, surface finish, expected shot life, and quality checks before approving a design. Longterm offers custom precision plastic injection moulds in single- or multi-cavity configurations, with optional hot runners and a stated mould life of 50,000 to 1,000,000 shots.

Start with the Part and Production Plan

Provide a part drawing or sample, along with your target production volume, finish requirements, and expected mould life. Longterm says its engineers can develop moulds from customer drawings or samples, including structural design and sample verification. These details give the supplier a basis for assessing the part geometry and proposing a suitable tooling configuration.

Production volume is one factor in deciding between a single-cavity and multi-cavity mould. Both options are listed, but the right arrangement depends on the part design and required output. The product minimum order quantity is one mould set. Longterm lists a delivery estimate of 20–35 days for moulds; injection-moulded production after sample approval is listed at 7–15 days, with the mass-production minimum negotiable.

Compare the Main Mould Specifications

The listed material and lifespan options are starting points for discussion, not guaranteed outcomes for every mould. Confirm the specifications against your part, production plan, and agreed project requirements.

Review Quality Checks and Support

Longterm lists incoming quality inspection (IQC), mould trial testing, dimensional inspection, and a full inspection before shipment. It also holds ISO 9001:2015 certification covering the design, manufacture, and sale of precision moulds and the sale of plastic products. Ask which inspection records will be supplied and how sample approval fits into the production schedule.

After-sales services listed include mould maintenance guidance, spare parts, online technical support, and consultation. Reported project examples include a handheld-device electronic housing mould and a double-shot overmould for a consumer-electronics shell. Client feedback cited dimensional accuracy, smooth surfaces, stable trial samples, and responsive communication.

Frequently Asked Questions

Can Longterm develop a mould from a drawing or sample?

Yes. The company states that it offers custom mould development based on customer-provided drawings or samples. Include the part requirements so the design can be reviewed.

How should I choose the cavity count?

Consider the part geometry and the output your project requires, then review the proposed cavity arrangement with the mould supplier. Longterm lists both single- and multi-cavity options; the appropriate choice is project-specific.

What inspections and support are available?

Listed checks include incoming inspection, mould trials, dimensional inspection, and inspection before shipment. Maintenance guidance, spare parts, online technical support, and consultation are also listed as after-sales services.

Next Steps

For a project review, prepare your part drawing or sample, target output, required finish, and expected mould life. Confirm the cavity layout, materials, runner configuration, inspection plan, and delivery schedule before production begins. Longterm lists one mould set as the mould product minimum order quantity and also offers injection-moulded production as a separate service model. For technical details or support, contact rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was founded in 2010 and serves international customers with mould design, tooling, precision machining, mould manufacturing, and parts production. The company reports a 50-person workforce, a 2,000-square-metre factory, annual output of approximately 180 moulds, and more than 120,000 precision-machined components. Its ISO 9001:2015 certification covers the design, manufacture, and sale of precision moulds and the sale of plastic products. Its project history includes customers in electronics, home appliances, and industrial manufacturing.