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EVIDENCE FOR ACCEPTANCE
Quality & Inspection for Injection Molded Parts
Quality starts with a controlled specification. Inspection cannot compensate for an undefined revision, missing tolerance, unclear cosmetic standard, or unapproved material substitution.
Control points through the project
Incoming
Identify the approved resin, color, inserts, purchased components, and documents required before use.
Tooling and T1
Review tool components and trial output against the agreed mold design, sample plan, and critical product characteristics.
Production
Use first-piece, in-process, and final checks at frequencies appropriate to part risk and the agreed plan.
Shipment
Confirm quantity, appearance, packaging, labels, required records, and disposition of known exceptions before release.
T1 dimensional and functional evidence
The report content is agreed before the trial. It may include selected critical dimensions, a broader dimensional layout, visual findings, process observations, assembly checks, or customer-defined tests. Measurement method and sample quantity must match the tolerance and decision being made.
Materials and traceability
When required, the project can define material certificates, lot identification, color references, supplied-component traceability, retained samples, and record linkage. The exact resin grade and applicable document—not a generic family name—control material acceptance.
FAI, PPAP, CMM, and other requested evidence
FAI, PPAP-style documentation, CMM reporting, gauges, fixtures, or special tests are included only when their availability, method, scope, format, sample size, and commercial impact are confirmed for the project. This page does not claim an unverified certification or owned-equipment list.
Nonconformance and engineering changes
A nonconformance should identify the requirement, affected lot or samples, evidence, containment, disposition authority, correction, and verification. Engineering changes require a new revision, impact review, approval, and an update to the production baseline.
Frequently Asked Questions
Do you provide a full dimensional report for every order?
Not automatically. The quotation or quality plan defines dimensions, sample quantity, method, frequency, and report format according to project risk.
Can you provide a material certificate?
It can be included when the exact grade, supplier documentation, traceability, and required certificate are identified before purchase.
What happens if a part is outside specification?
The affected material is controlled while the requirement, extent, cause, disposition, correction, and verification are reviewed with the authorized stakeholders.
Related Resources
Reviewed by Jerry Zou · Last updated August 28, 2026
Technical recommendations for a live project depend on the submitted revision, exact material grade, quality requirements, quantity, and agreed scope.
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