Start with approved reference samples
Before pilot production, the buyer and supplier should agree which sample is the reference part. This includes appearance, color, dimensions, material, assembly fit and any accepted minor issues. Without a reference sample, every later batch can become a new discussion.
If the T1 or T2 sample still has open issues, list them clearly. Some issues may require mold correction before pilot production, while others can be watched during the pilot run.
Confirm the process window, not only one good shot
A stable injection molding process should not depend on one narrow setting. Pilot production checks whether material drying, melt temperature, mold temperature, injection speed, holding pressure, cooling time and cycle time can produce repeatable parts. Process records are important because they become the baseline for future production.
For precision plastic parts and housings, process stability is connected with dimensions, warpage, sink marks, appearance and assembly gap.
Use an inspection plan that matches the real risk
The inspection plan should include critical dimensions, visible surfaces, functional features, assembly points and packaging condition. Sampling quantity should match part risk and production volume. For connector parts, slot dimensions and burrs may be critical. For plastic housings, appearance and assembly gap may matter more.
Do not forget assembly and packaging checks
A molded plastic part may pass dimension inspection but fail during assembly, screw tightening, snap-fit testing, painting, printing or packaging. Pilot production is a good time to check how parts behave after cooling, storage, secondary processing and shipment handling.
Packaging is especially important for cosmetic housings. Scratches, deformation and mixed colors can happen after molding if trays, bags or cartons are not suitable.
Keep clear records before mass production approval
Mass production approval should be based on sample approval, inspection records, process window, packaging confirmation and buyer feedback. If a future batch has a problem, these records help the team compare what changed.
Related pages: T1 and T2 mold trial process, custom injection molding services and quality management.