Molded-Part Acceptance

Injection Molded Part Acceptance Criteria Checklist

Quick answer: accept or disposition a molded sample or production lot only against controlled project requirements. The decision should be recorded as PASS, HOLD, REWORK, or REJECT based on approved dimensional, cosmetic, functional, material, and traceability criteria—not on an invented generic tolerance or an undefined visual judgment.

The acceptance baseline should come from the released drawing, specification, CTQ requirements, approved visual or limit sample, functional requirements, material records, and any authorized deviation applicable to the inspected sample or lot.

For the wider validation sequence, use the injection molding validation and release procedure .

Injection molded part with released drawing CTQ inspection evidence and acceptance disposition criteria — Acceptance should connect the approved requirement, inspection evidence, and authorized disposition for the same molded sample or lot.

Part acceptance only: this page determines whether molded samples or production parts meet the approved acceptance basis. Final mold-tool buy-off belongs in injection mold acceptance criteria . FAI reporting, PPAP documentation, SPC, sampling design, process-window validation, and defect root-cause analysis remain separate topics.

PASS HOLD REWORK REJECT

Controlled Acceptance Baseline

Build the Acceptance Decision from Approved Requirement Sources

PASS, HOLD, REWORK, or REJECT should be decided against a controlled acceptance baseline—not against inspector preference or a generic quality checklist. Before inspection begins, the reviewer should know which released requirements apply to the specific part revision, sample or lot, cavity, material, and approval condition.

Design & CTQ

Use the released drawing, specification, tolerances, CTQ or special-characteristic requirements, and approved engineering changes that apply to the inspected part.

Visual & Functional

Use the approved cosmetic specification, master or limit sample, assembly interface, and required functional or performance criteria where applicable.

Material & Traceability

Confirm the approved resin or material requirement, lot or batch traceability, cavity identity where required, labeling, and any controlled packaging requirement.

Deviation & Authority

Include any authorized deviation, concession, temporary approval, or customer-specific instruction, and identify who has authority to release or disposition the sample or lot.

Ballooned drawing with CTQ callouts linking released injection molded part requirements to inspection and acceptance decisions — A controlled acceptance baseline links the released requirement to the inspection result and the authorized disposition for the same molded sample or production lot.

Control Rule

Do not create acceptance limits during inspection. Tolerances, cosmetic limits, test thresholds, sampling requirements, and release conditions should come from an approved project source or authorized deviation before the result is dispositioned.

Dimensional & CTQ Acceptance

Accept Dimensions Against the Released Requirement—not a Generic Tolerance

A dimensional result is acceptable only when it is compared with the released drawing, specification, or approved CTQ requirement for the same part revision. The record should identify what was measured, the applicable limit, the actual result, the approved inspection method, and the sample or lot represented by that result.

Confirm the Requirement

Use the released dimension, GD&T callout, CTQ designation, or approved specification. Do not replace a project-defined tolerance with an internal default.

Confirm the Evidence

Link the measured result to the correct revision, sample or lot, inspection method, and cavity identity when cavity-level evidence is required by the approved scope.

Record the Disposition

PASS requires conformity to the approved limit. Missing, conflicting, or incomplete evidence should remain HOLD until the acceptance basis is clarified or an authorized deviation is issued.

FAI boundary: an injection molding FAI evidence record documents measured results against an approved requirement; it does not create the acceptance limit.

No universal cavity rule: separate cavity evidence only when required by the drawing, customer, inspection plan, or approved acceptance scope.

Authority Reference

Where contractually applicable, ISO 20457:2026 provides a plastics-specific framework for dimensional and geometrical tolerances and acceptance conditions. The released product definition and agreed customer requirements remain the governing acceptance basis.

Cosmetic Acceptance

Judge Appearance Against an Approved Visual Boundary

Cosmetic acceptance should be based on an approved visual specification, drawing note, master sample, limit sample, or other project-defined reference. A reviewer should not invent universal limits for scratches, flow marks, weld lines, gloss variation, color difference, gate vestige, sink, or other visible conditions during inspection.

01 · Reference

Use an Approved Visual Standard

Identify the applicable surface area or appearance class and the approved reference that defines what is acceptable for that part. Customer-approved master or limit samples should remain revision and program controlled.

02 · Inspection Condition

Control How the Surface Is Reviewed

Apply the viewing distance, lighting, orientation, inspection time, or other observation condition only when it is defined by the approved visual requirement or inspection procedure.

03 · Evidence

Record the Observed Condition

Link the visual result to the correct part revision, sample or lot, cavity where required, and the reference used for comparison so the final disposition can be reconstructed.

Disposition rule: PASS means the observed appearance remains within the approved visual boundary. An unresolved or borderline condition should remain HOLD until the authorized reviewer determines whether rework, deviation, or rejection is appropriate.

No universal cosmetic limit: do not apply generic defect sizes, viewing distances, surface classes, or allowable counts unless the customer, drawing, specification, or approved project standard actually defines them.

Functional & Assembly Acceptance

Dimensional PASS Does Not Automatically Mean Functional PASS

A molded part can meet its dimensional limits and still fail the intended fit, assembly, sealing, retention, movement, or interface requirement. Functional acceptance should therefore be based on the released assembly requirement, approved test plan, mating-part condition, fixture, or other project-defined functional criterion.

01 · Requirement

Define the Functional Expectation

Identify the approved requirement for fit, snap engagement, thread, sealing, movement, retention force, alignment, or other relevant interface before the part is tested.

02 · Method

Use the Approved Check

Evaluate the part with the specified mating component, fixture, gauge, assembly condition, or defined test method. Do not substitute an unapproved shop-floor check for the required verification.

03 · Disposition

Separate Function from Dimension

A functional failure should remain HOLD or follow the authorized disposition path even when the measured dimensions are individually within tolerance.

Boundary Rule

This section verifies the released functional requirement; it does not develop the test method. Validation planning, cycle testing, reliability development, and process qualification remain outside this acceptance checklist.

Material & Traceability Acceptance

Confirm the Approved Material and Preserve the Release Trace

Material acceptance requires more than confirming that a molded part looks correct. The inspected sample or production lot should be traceable to the approved resin or material requirement, applicable grade or color, relevant lot or batch record, and the production identity required by the project before final release.

01 · Material

Approved Grade

Confirm the specified resin or material grade, color, filler, additive, or other controlled material condition where applicable.

02 · Lot

Material Traceability

Link the inspected parts to the required supplier, batch, lot, certificate, or other approved material record.

03 · Production

Part Identity

Preserve sample or production-lot identity and cavity identification where the approved acceptance scope requires cavity-level traceability.

04 · Release

Label & Packaging

Verify required labeling, identification, quantity, and protective packaging only when they form part of the approved release criteria.

PASS requires identity as well as conformity. If the material or production lot cannot be traced to the approved requirement, the parts should not receive an unconditional release.

Scope rule: do not assume that every project requires a COA, every cavity to be separately reported, or the same labeling and packaging controls. Apply only the approved project requirements.

Acceptance Disposition

Assign PASS, HOLD, REWORK, or REJECT from the Evidence

The final disposition should connect the approved acceptance requirement to the inspected sample or lot, the recorded evidence, any applicable deviation, and the person authorized to make the release decision. A status should describe the actual approval state, not simply whether a part appears acceptable.

Closure rule: do not issue an unconditional PASS when required evidence is missing, the requirement is unclear, traceability is broken, or an exception still requires authorized approval.

Drawing inspection traceability and deviation evidence supporting molded part acceptance disposition — The disposition should be reconstructable from the applicable requirement, inspection evidence, deviation status, and approval record.

PASS

All applicable acceptance requirements are met, required evidence is complete, traceability is intact, and no unresolved exception prevents release.

HOLD

The acceptance decision remains open because evidence, requirement clarification, traceability, or authorized deviation approval is still pending. HOLD is not the same as REJECT.

REWORK

A defined and authorized corrective action may restore conformity. The affected requirement must be reverified after rework before the part or lot can receive final acceptance.

REJECT

The part or lot does not meet an applicable approved requirement and cannot be accepted as submitted. Final handling should follow the applicable disposition authority.

Part Revision + Sample / Lot

Inspection Evidence

Deviation / Rework Status

Reviewer + Sign-Off Date

Decision authority matters: an inspector may record the observed result, but deviation approval, conditional release, rework acceptance, or final rejection should be issued by the person or function authorized by the applicable customer, quality plan, or project procedure.

Deviation & Conditional Approval

A Deviation Must Define What Is Being Accepted—and for How Long

A part that does not fully meet the normal acceptance basis should not silently become PASS. When an exception is allowed, the deviation, concession, or conditional approval should identify the affected requirement, the parts covered, the approval authority, and the period or condition for which the exception remains valid.

01 · Requirement

Identify the Exception

Record the drawing feature, cosmetic requirement, functional criterion, material condition, or other released requirement being deviated.

02 · Scope

Define What It Covers

Tie the approval to the applicable part revision, sample, production lot, quantity, cavity, or other controlled scope where required.

03 · Validity

Set the Approval Window

State whether the exception applies to one sample, one lot, a defined quantity, or another authorized period or release condition.

04 · Authority

Record Who Approved It

Identify the customer, quality, engineering, or other authorized function that approved the exception and the required closure status.

HOLD is not approval. HOLD means the decision remains open. The affected parts should remain on hold until the required evidence, clarification, rework verification, or authorized deviation closes the acceptance decision.

Conditional approval is scope-limited. Acceptance under deviation does not permanently change the drawing, specification, visual limit, or future production requirement unless the controlling project documents are formally revised.

Do not convert a temporary exception into a new acceptance rule. A deviation should remain traceable to its approved scope and validity; later lots should return to the released acceptance basis unless a new authorization or controlled revision applies.

Acceptance Checklist Download

Download the Injection Molded Part Acceptance Criteria Checklist

Use the checklist to connect the released requirement, inspection evidence, traceability, disposition, deviation status, and approval authority for a molded sample or production lot. Replace each field with the actual project requirements before using it for release.

Controlled Baseline Dimensional / CTQ Cosmetic / Functional PASS / HOLD / REWORK / REJECT Deviation & Approval

Open Acceptance Checklist PDF

PDF · v1.0 · Project-specific review template

Use note: the PDF is a controlled review framework, not a universal tolerance, cosmetic-limit, AQL, sampling, or test-threshold standard. Apply only the drawing, customer, specification, quality-plan, test-plan, visual, material, and deviation requirements approved for the actual project.

Acceptance Criteria FAQ

Final Questions Before Releasing a Molded Part

Who defines the acceptance criteria?

Use the released drawing, specification, customer requirement, approved visual or test standard, and any authorized deviation applicable to the part.

Is HOLD the same as REJECT?

No. HOLD means the decision is still open because evidence, clarification, rework verification, or authorized approval is pending.

Does dimensional PASS guarantee functional acceptance?

No. Fit, sealing, movement, retention, assembly, or another released functional requirement may still require separate verification.

Does a deviation permanently change the acceptance requirement?

No. A deviation applies only to its approved scope and validity unless the controlling requirement is formally revised.

Acceptance Criteria Review

Need a Clear Release Basis for Your Molded Part?

Send the released drawing, CTQs, material specification, visual or functional requirements, and traceability needs. SPI can help organize the acceptance basis before sample approval or production release.

Review Your Acceptance Criteria Custom Injection Molded Parts