What to Check in a Plastic Mold Trial Report Before Approving First Samples

Before approving the first plastic parts from a new tool, review a trial report that links the mold run to the samples in front of you. It should summarize the trial, list dimensional inspection results, identify the applicable material and finish requirements, and clearly state whether the samples are approved or still need work.

Start with the Trial Outcome and Sample Status

The report should identify the mold configuration used and describe the trial outcome, including any defects or other observations that may need attention. Record the inspection methods performed, such as mold trial testing and dimensional checks, and state whether the samples have been confirmed, require revision, or are awaiting further review.

Longterm lists mold trial tests, dimensional inspection, and a full check before shipment among the quality checks for its custom electronic-housing molds. Depending on the service, its checks may also include 3D inspection, first-article inspection, CMM testing, or multi-cycle trials for complex precision molds.

Match the Samples to the Project Requirements

Include the material, cavity arrangement, and surface finish specified for the job so reviewers can confirm that the samples reflect the intended setup. Longterm lists P20, 718H, and 1.2738 as mold materials, ABS, PC, and PP as supported plastics, and polishing, texture, and matte as available finishes. The tooling may use a single- or multi-cavity configuration. These product details are reference points; use the project’s agreed specifications to determine what applies to a particular sample.

Document Measurements and Visual Findings

For each inspected feature, record the measured value and compare it with the tolerance on the relevant drawing. Longterm’s product information lists a precision tolerance of ±0.02 mm, but that figure should only be used for features where the applicable project requirement specifies it. Do not assume it governs every dimension.

Note appearance issues as well as dimensional results, including any surface or alignment concerns. If a measurement or visual check does not meet the agreed requirement, describe the issue and identify any correction or retest needed.

Trial Report Checklist

Questions to Resolve Before Sign-Off

Should measured dimensions appear in the report?

Yes. Include the dimensions inspected, the results, and the applicable drawing requirements used for comparison. Dimensional inspection is among the quality checks Longterm lists.

Is ±0.02 mm the acceptance limit for every feature?

No such universal application is specified. The product information lists ±0.02 mm as a precision tolerance, so confirm the tolerance assigned to each feature in the relevant project documentation.

What if a sample is not ready for approval?

Keep its status pending, record the unresolved issue, and note the correction or review needed before approval. Longterm lists mold modification support and technical guidance among its after-sales services.

Make the Approval Decision Clear

A useful report brings together the trial outcome, measurement results, visual observations, applicable material and finish specifications, and a clear decision on sample status. Longterm provides custom mold making, injection molding, mold development, and plastic injection production. For technical support or project details, contact rogerluo@longterm-mold.com.

About Longterm

Longterm Manufacturing Solutions Limited was founded in 2010 and serves international customers with mold design, tooling, precision machining, mold manufacturing, and parts production. The company reports a team of 50 employees, including five R&D engineers specializing in molds and precision machining, and serves markets in North America, Europe, and Australia. Longterm holds ISO 9001:2015 certification for its stated precision-mold and plastic-product scope. Its application areas include consumer electronics housings, connectors, and accessories. In one French double-shot overmolding case, eight sets were produced, with customer feedback noting good alignment and stable trial samples.