How to Select an Injection Mould for Your Plastic Material and Production Volume

Choosing an injection mould starts with your part’s resin, design, and expected production run. The mould’s materials and construction should be confirmed against those requirements, and its projected service life should cover the number of shots you anticipate. Longterm lists S50C and P20 mold bases, cavity steels 718H, 1.2738, and S136, plus cold- and hot-runner options. Its stated mould-life range is 50,000–1,000,000 shots; ask the supplier to confirm what applies to your specific tooling.

Start with the Part and Production Plan

Before requesting a quotation, provide the mould maker with the plastic material, part specifications, and estimated total shot count. These details help the supplier recommend a suitable steel and mould configuration. The available product information lists material and runner options, but does not say which combination is right for a particular resin or application, so obtain a project-specific recommendation.

Longterm offers mold bases in S50C or P20, and cavity steels in 718H, 1.2738, or S136. Customers can also choose between cold and hot runners. Confirm the proposed selection in writing, including its suitability for the part design and the intended production conditions.

Check Mould Life, Inspection, and Timing

Compare your forecast production volume with the stated mould life of 50,000–1,000,000 shots. This is a broad range: the supplied details do not link a particular service life to a steel grade, mould design, or operating condition. Ask the mould maker to specify the expected life for the tooling being quoted.

Quality checks listed for this product include a mould trial, dimensional inspection, and a full inspection before shipment. Set the acceptance dimensions and sample-approval process before production begins. Longterm also describes a service model that can include custom tooling and mould development, followed by injection-moulding production after sample approval.

The minimum order is one mould set, and the stated delivery period is 25–40 days. Confirm the schedule for your project, since its requirements may affect the quoted lead time.

Selection Factors at a Glance

Applications and Supplier Information

Examples of applications cited by the company include consumer-electronics enclosures and connectors, as well as household-appliance housings and control panels. Longterm reports ISO 9001:2015 certification covering the design, manufacture, and sale of precision moulds, and the sale of plastic products.

In a company-reported project for an Italian customer, Longterm supplied three mould sets for a handheld-device housing. The customer review mentioned dimensional precision, a smooth surface, and on-time delivery. This is a reported case, not a promise of identical outcomes on other projects.

Frequently Asked Questions

What cavity-steel grades can I choose from?

The listed choices are 718H, 1.2738, and S136. Since the product information does not match individual grades to specific resins, ask the mould maker to recommend and confirm the grade for your part.

How can I tell whether the mould will last through my production run?

Compare your estimated shot count with the stated range of 50,000–1,000,000 shots, then request a written estimate for your proposed mould. The published range is not broken down by steel or production conditions.

Which inspections are included?

The listed checks are a mould trial, dimensional inspection, and a full inspection before shipment. Agree on the required dimensions, inspection criteria, and sample-approval steps for your order.

Practical Recommendation

To select tooling that fits both the material and production volume, share the resin specification, part requirements, and expected shot count with the supplier. Ask them to document the recommended steel, runner arrangement, and mould-life estimate for the specific design. Longterm lists a one-set minimum, a 25–40-day delivery period, and online technical support, maintenance guidance, and spare-parts supply. For technical assistance, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was established in 2010 and provides mould design, tooling, precision machining, mould manufacturing, and parts production. Its customers are located in North America, Europe, Australia, and other markets. The company reports operating a 2,000-square-meter factory with a team of 50 employees. Its reported project experience includes moulds for consumer electronics, home appliances, and industrial parts.