Choosing the Right Injection Mould Cavity Count for Output, Quality, and Cost

The best cavity count is the one that can meet your production needs without making tooling costs or part-quality requirements impractical. Longterm’s product information does not prescribe a cavity number or state a target output, so these project details must be established before selecting a configuration. Its double-shot overmolding mould is quoted from one set, with multi-cavity designs available as an option.

Start with Production Requirements

A mould with more cavities can produce more parts per cycle, but the supplied information does not quantify cycle times, output rates, tooling costs, or quality limits for different configurations. Compare candidate cavity counts against your expected part volume, production schedule, and tooling budget rather than choosing on output alone.

For a double-shot mould, the decision also depends on alignment between the two shots and compatibility of the selected materials. Longterm lists combinations including ABS+TPU and PP+TPE. Confirm the part specifications and quality criteria, then use trial samples and dimensional measurements to check that the proposed design meets them.

Capabilities and Validation

The Custom Double Shot Overmolding Mold is listed with high-precision alignment and optional multi-cavity configurations. Its stated mould steel is 718H / 1.2738, and the product information gives a service life of up to 800,000 shots. These specifications describe the offering; they do not establish a recommended cavity count for a particular project.

Longterm identifies mould trial runs, dimensional testing, and pre-shipment inspection as inspection steps. Agree on sample acceptance criteria in advance and review the trial and measurement results before approving production.

The company also reports supplying eight double-shot moulds for consumer electronics shells for a French product brand. Customer feedback cited good alignment and stable trial samples, but the case information does not state how many cavities those moulds had.

What to Confirm Before Choosing

Frequently Asked Questions

Is a recommended cavity count provided?

No. The product information says multi-cavity is optional, but it does not specify a count or compare the output of different configurations.

What should be known before selecting the count?

Establish the expected production quantity and schedule, acceptable tooling investment, part requirements, and criteria for approving samples. The available product data does not supply these project-specific values.

How should a double-shot mould design be validated?

Review mould trial samples and dimensional test results, and confirm pre-shipment inspection requirements. Define the acceptance criteria before the trial so the results can be assessed consistently.

Recommendation

Choose a cavity count after comparing production demand and quoted tooling costs, then verify the proposed design through mould trials and dimensional checks. The available information does not support a universal cavity-count recommendation. Longterm offers custom double-shot overmolding moulds with optional multi-cavity configurations and a minimum order of one set. For technical guidance, contact Roger Luo at rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was founded in 2010 and provides mould design, tooling, precision machining, mould manufacturing, and parts production for international customers. The company reports a team of 50 employees, including seven experienced engineers, and designs and manufactures more than 300 moulds annually. Its main markets are North America, Europe, and Australia. Longterm reports ISO 9001:2015 certification, and its case examples include consumer electronics, household appliances, and industrial parts.