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Mold Tool Acceptance Guide
Injection mold acceptance criteria define the project-specific conditions used to determine whether a mold can be accepted, conditionally approved, held, or signed off. The decision can include dimensional conformity, cosmetic requirements, mold function, run-off performance, open-issue closure and final handover requirements according to the agreed customer scope.
Acceptance Decision Scope
Mold acceptance criteria define the conditions used to decide whether the current tool state can be accepted, conditionally approved, or held. They do not replace the broader validation procedure; they establish the project-specific limits and sign-off conditions used at the acceptance gate.
Confirm whether defined dimensions, datums, interfaces and critical characteristics meet the released drawing or agreed customer requirements.
Apply approved surface zones, visual limits, texture or finish requirements and reference samples where they form part of the tool approval scope.
Confirm that agreed tooling functions such as ejection, shut-offs, cooling, movement and other mechanical features operate acceptably for the intended release condition.
Confirm whether the agreed run-off condition, open-issue closure and required release or handover records support the final acceptance decision.
The required acceptance conditions for the defined release scope have been satisfied and no unresolved issue prevents sign-off.
The mold may move forward only under documented conditions, deviations or closure actions that have been formally agreed for the project.
One or more required acceptance conditions remain unresolved, inconsistent or outside the agreed release requirements.
Acceptance Baseline
A PASS, CONDITIONAL or HOLD decision is only meaningful when the drawing, CTQs, material condition, cosmetic rules, measurement method and production assumptions are already defined. Acceptance evidence should be judged against one controlled baseline, not against changing assumptions after the trial.
Acceptance inputs establish the reference condition used to judge dimensional, cosmetic, functional and run-off evidence. If the drawing revision, datum method, resin condition, visual standard or sampling basis is unclear, the acceptance result can become inconsistent even when the molded samples themselves appear similar.
The objective is not to define every process-development method here. It is to make sure that the requirements used for acceptance are controlled before the evidence is interpreted.
Confirm the active drawing revision, designated CTQs, datum scheme, interfaces and any customer-specific dimensional requirements that will be used for acceptance.
Confirm the approved resin grade, reinforcement or filler condition, material preparation and any post-molding conditioning that can affect dimensions, appearance or function.
Define the visual zones, texture or finish requirements, applicable defect categories, viewing conditions and approved reference samples where cosmetic acceptance is part of the project.
Define the inspection method, fixture or datum interpretation, cavities or features to be checked, sample condition and sampling scope required for the acceptance decision.
Record the agreed press, tooling setup, resin condition, cooling or auxiliary assumptions and run-off conditions that the acceptance evidence is intended to represent.
| Acceptance Input | What Must Be Defined | Why It Matters | Hold Condition |
|---|---|---|---|
| Drawing / CTQ Basis | Active revision, CTQs, datums, interfaces and customer requirements. | Establishes the dimensional and functional requirement being judged. | Revision, datum or CTQ basis is inconsistent. |
| Material Basis | Approved resin grade, reinforcement and conditioning condition. | Ensures the sample set represents the intended material state. | Material or conditioning condition is not representative. |
| Cosmetic Basis | Surface zones, defect rules, viewing conditions and reference samples where applicable. | Prevents subjective or shifting cosmetic judgment. | No approved visual reference or acceptance rule exists. |
| Inspection Basis | Method, fixture, datum interpretation, sample state and inspection scope. | Keeps acceptance evidence comparable and repeatable. | Measurement or sampling basis is unresolved. |
| Run-Off Basis | Agreed press, tooling setup, material state and representative production assumptions. | Defines the condition that the acceptance evidence represents. | Evidence was generated outside the agreed release basis. |
Dimensional Acceptance
Dimensional acceptance asks whether the molded evidence meets the released drawing, approved datum basis and designated CTQ requirements for the defined tool-approval scope. Acceptance should be based on representative evidence and an agreed inspection basis rather than on isolated dimensions from one selected sample.
Judge dimensional results against the active drawing revision, approved tolerances, datum scheme and customer-defined CTQ requirements applicable to the tool being accepted.
The fixture, datum interpretation, measurement method and sample condition should match the agreed inspection basis so results can be compared without changing the acceptance rule.
Where the approval scope includes multiple cavities or critical interfaces, the evidence should identify which cavity, feature or sample each result represents.
Out-of-tolerance or unresolved CTQ results should be dispositioned through correction, agreed deviation, conditional approval or hold rather than being removed from the approval record.
The exact tolerance and disposition rules remain project-specific, but dimensional evidence normally supports one of three acceptance states.
| Review Item | Acceptance Basis | Evidence Focus | Potential Hold Condition |
|---|---|---|---|
| Drawing Revision | Current released drawing or approved customer requirement. | Revision traceability between drawing, samples and inspection report. | Samples or inspection data belong to a different revision. |
| Datum & GD&T Basis | Agreed datum structure and feature interpretation. | Fixture, setup and measurement approach align with the approved basis. | Datum interpretation changes the acceptance result. |
| CTQ Features | Customer-defined critical dimensions or interfaces. | Required CTQs are measured and traceable to the applicable cavity or sample. | Required CTQ evidence is missing, inconsistent or unresolved. |
| Cavity-Specific Results | Approved cavity plan and inspection scope. | Results identify whether dimensional variation is cavity specific where relevant. | Required cavity evidence cannot support the agreed acceptance scope. |
| Deviation / Correction | Approved deviation, correction plan or customer disposition. | Open dimensional issues remain traceable to closure or formal acceptance. | An unresolved dimensional issue has no controlled disposition. |
Cosmetic Acceptance
Cosmetic acceptance determines whether molded surfaces meet the approved appearance zones, defect limits, texture or finish requirements and reference conditions defined for the project. Visual judgment should use a controlled acceptance basis rather than subjective inspection after the trial.
Identify which surfaces are appearance-critical and whether different zones have different acceptance expectations. Cosmetic requirements should reflect the approved drawing, specification or customer appearance standard.
Establish which visible conditions are unacceptable, acceptable or subject to an agreed limit. The boundary may include appearance issues such as flash, sink, weld lines, flow marks, burns, gloss variation or other project-defined defects.
Where appearance is subjective, define the viewing distance, lighting, inspection angle, surface cleanliness and any approved limit sample or reference part used for comparison.
Texture, polish, gloss or surface-finish requirements should remain traceable to the approved tooling and part specification so that the final acceptance decision uses the intended visual standard.
The exact defect limits remain project-specific. Cosmetic evidence should nevertheless lead to a controlled acceptance status rather than an informal visual judgment.
| Review Item | Acceptance Basis | Evidence Focus | Potential Hold Condition |
|---|---|---|---|
| Appearance Zone | Approved drawing, surface map or customer visual requirement. | Critical and non-critical surfaces are clearly identified. | Surface classification is missing or inconsistent. |
| Defect Limit | Approved defect rule, specification or boundary sample. | Visible conditions are compared against a defined limit. | A visible issue exceeds the agreed limit or has no disposition. |
| Texture / Finish | Approved texture, polish, gloss or finish requirement. | Molded appearance represents the intended tooling finish. | Finish result does not match the approved requirement. |
| Inspection Condition | Agreed viewing and comparison method where required. | Inspection is performed under a consistent visual basis. | Different viewing conditions create conflicting judgments. |
| Reference Sample | Approved master or limit sample when the project uses one. | Production-intent samples are compared to the correct reference. | No controlled reference exists for a subjective requirement. |
Mold Function Acceptance
Mechanical acceptance asks whether the mold’s shut-offs, guidance, cooling, ejection, venting and controlled movements function as required for the agreed release condition. A mold should not receive final sign-off when unresolved mechanical behavior can compromise part quality, safe operation or repeatable use.
Review the agreed sealing and shut-off condition for interference, abnormal wear, mismatch or other issues that can affect flash, alignment or tool operation.
Confirm that guide components, slides, lifters and other controlled movements operate without abnormal contact, binding or alignment conditions that prevent acceptance.
Confirm that required cooling circuits are identified, connected and free from unresolved leakage or functional issues that would prevent the mold from operating under the agreed release condition.
Ejector movement, return condition and part release should operate without unresolved interference, sticking or damage that would make normal tool operation unacceptable.
Venting condition should be sufficient for the approved part and tooling state, with no unresolved functional issue clearly linked to trapped gas or blocked vent paths.
Where applicable, hot-runner control, sensors, hydraulic or pneumatic actions, sliders and lifters should operate according to the approved tool sequence without unresolved motion conflicts.
The required mechanical checks depend on mold design and project scope, but unresolved functional conditions should be dispositioned before final tool sign-off.
| Functional Area | Acceptance Focus | Evidence or Review | Potential Hold Condition |
|---|---|---|---|
| Shut-Off / Parting Line | Contact, sealing and alignment condition. | Visual, functional or agreed mechanical review. | Interference, mismatch or unresolved condition affects normal operation. |
| Guidance / Motion | Slides, lifters, guides and controlled movements. | Movement or dry-cycle review where applicable. | Binding, collision, abnormal wear or motion conflict remains unresolved. |
| Cooling | Circuit integrity, identification and leakage condition. | Agreed pressure, leak or flow verification where required. | Unresolved leakage, blocked circuit or incorrect connection prevents release. |
| Ejection | Stroke, return and normal part-release behavior. | Functional ejection review under the intended tool condition. | Sticking, interference, damage or unreliable return remains unresolved. |
| Venting | Functional vent condition at relevant fill locations. | Visual or tool-condition review linked to observed molding behavior. | An unresolved venting condition prevents acceptable part or tool performance. |
| Hot Runner / Controls | Heater, sensor, valve, hydraulic or pneumatic function where applicable. | Functional control and sequence verification. | Fault, sequence conflict or control instability prevents intended operation. |
Run-Off Acceptance
Run-off acceptance asks whether the mold can operate under the agreed production-representative condition without unresolved drift, abnormal intervention or cavity behavior that prevents the intended release. The exact run duration, sampling interval and monitored parameters should follow the customer-approved acceptance or validation plan.
The run-off should represent the approved mold, resin, press, tooling setup and production assumptions used for the acceptance decision.
Required parameters and setup conditions should remain within the agreed operating basis, with any intentional change documented rather than hidden inside the run.
Where relevant, review part weight, cavity-to-cavity behavior, visible defects, CTQ trend, ejection and other agreed indicators for instability that could affect sign-off.
Samples, cavity IDs, run conditions, deviations and approval notes should remain traceable to the same tool state and release decision.
The acceptance limit is project-specific, but the observed run should support a controlled disposition rather than an informal “looks stable” judgment.
| Review Item | Acceptance Basis | Evidence Focus | Potential Hold Condition |
|---|---|---|---|
| Run Duration / Sampling | Customer-approved run-off or acceptance plan. | Required run duration, sample timing and records are complete. | Run length or sampling basis does not meet the agreed scope. |
| Operating Condition | Approved molding setup and defined production assumptions. | The run remains within the intended release condition. | Undocumented or out-of-scope adjustments materially affect the result. |
| Cycle & Ejection Behavior | Agreed functional and production requirements. | Cycle behavior and part release remain suitable for the acceptance scope. | Repeated manual intervention, sticking or abnormal interruption remains unresolved. |
| Part / Cavity Trend | Project-defined CTQ, weight, appearance or cavity-review requirement. | No unresolved trend suggests that one cavity or run condition is not representative. | Cavity-to-cavity or time-based drift prevents a controlled acceptance decision. |
| Run-Off Records | Agreed acceptance documentation scope. | Samples, conditions, deviations and approval status remain traceable. | Missing records prevent the run from being linked to the final sign-off condition. |
Capability Evidence
Cp, Cpk, Ppk or other capability evidence should become part of the acceptance gate only when the customer requirement, CTQ classification or agreed quality plan makes statistical capability relevant to the release decision. A capability study is not a universal requirement for every mold or every dimension.
Determine whether capability evidence is explicitly required for the program, part family or designated CTQ before it is treated as an acceptance condition.
Capability evidence should focus on designated characteristics where process variation matters to fit, function, safety, sealing, assembly or another customer-defined requirement.
Capability results used for acceptance should represent the agreed tool, material, cavity, process and measurement condition rather than a selectively chosen sample set.
The inspection method must be suitable for the characteristic before capability results are relied upon. Formal MSA or Gage R&R should be used when required by the customer or applicable quality plan.
The actual statistical target belongs to the customer specification or approved quality plan. This page does not assign a universal Cp, Cpk or Ppk threshold.
| Review Item | Acceptance Basis | Evidence Focus | Potential Hold Condition |
|---|---|---|---|
| Capability Requirement | Customer specification, CTQ plan or approved quality requirement. | Capability is required only for the defined characteristics. | Required capability scope or target is unclear. |
| Characteristic Selection | Designated CTQ or customer-defined feature. | Statistical evidence is tied to the correct dimensional or functional characteristic. | Capability is reported for the wrong or non-approved feature. |
| Measurement Basis | Approved measurement method and any required MSA evidence. | Measurement variation does not make the capability conclusion unreliable. | Measurement suitability is unresolved. |
| Sample / Run Condition | Agreed capability or production-sampling condition. | Data represents the intended tool, cavity, resin and process condition. | Sample selection or process condition is not representative. |
| Disposition | Customer-defined target and approved deviation process. | Result is clearly accepted, conditionally accepted or held. | An unmet capability requirement has no controlled disposition. |
Acceptance Decision Matrix
Final mold acceptance should combine the required dimensional, cosmetic, functional, run-off and capability evidence into one controlled disposition. A PASS, CONDITIONAL or HOLD decision should reflect the defined release scope and any approved deviations, not a single isolated result.
The required acceptance conditions are satisfied for the defined tool release scope, and no unresolved issue prevents approval.
Acceptance may proceed only when the remaining issue, deviation or corrective action is documented and formally permitted within the project scope.
The mold remains on hold when a required acceptance condition is unresolved, inconsistent, non-representative or outside the approved requirement.
| Acceptance Domain | PASS | CONDITIONAL | HOLD |
|---|---|---|---|
| Dimensional & CTQ |
PASS Required dimensional evidence meets the agreed acceptance basis. |
CONDITIONAL A controlled dimensional deviation or correction remains open. |
HOLD A required CTQ, datum basis or dimensional result is unresolved. |
| Cosmetic |
PASS Required appearance zones meet the approved cosmetic standard. |
CONDITIONAL A documented visual deviation or agreed limit remains open. |
HOLD A required appearance condition is outside the approved limit or lacks a usable acceptance basis. |
| Mold Function |
PASS Required mechanical and tooling functions operate acceptably. |
CONDITIONAL A controlled tooling issue remains with an agreed closure plan. |
HOLD Mechanical, cooling, ejection, motion or leakage issues prevent release. |
| Run-Off |
PASS The required run-off condition supports the intended release. |
CONDITIONAL A defined run-off deviation is formally accepted within a limited release. |
HOLD The run is non-representative, unstable or incomplete for the approval scope. |
| Capability Where Required |
PASS Required capability evidence meets the customer-defined target. |
CONDITIONAL A capability gap has an approved deviation, containment or closure plan. |
HOLD Required capability evidence is missing, non-representative or outside the agreed requirement. |
| Documentation / Closure |
PASS Required records and open-item closure support final sign-off. |
CONDITIONAL A limited document or closure item remains under formal control. |
HOLD Missing traceability, unresolved records or approval gaps prevent release. |
A prototype, export-tool handover, production release or customer-controlled approval may require different evidence. The acceptance decision should therefore reflect the actual scope being approved.
Acceptable dimensional or cosmetic evidence does not automatically release the mold if another required functional, run-off, capability or documentation condition remains unresolved.
Closure & Final Sign-Off
Final sign-off should confirm that the accepted tool condition, remaining deviations, corrective actions and required handover records all refer to the same approved mold state. A mold should not be released simply because the latest sample is acceptable if unresolved issues or missing records can no longer be traced to closure.
Each open dimensional, cosmetic, tooling, run-off or documentation issue should have a defined status, responsible owner and approved closure or deviation path before final release.
New evidence should identify the affected feature, tool revision, sample set or process condition so the closure can be linked directly to the issue that triggered it.
As-built data, drawings, inspection records, process sheets and issue logs should reference the correct final tool condition rather than an earlier trial or superseded revision.
Final release should include the customer-required documentation, tooling records and maintenance or spare information needed for the defined production, transfer or export-handover scope.
Closure evidence should be proportional to the affected requirement. The objective is to show that the issue has either been corrected or formally accepted under a controlled deviation.
| Record Group | Final Sign-Off Focus | Typical Record | Potential Hold Condition |
|---|---|---|---|
| Acceptance Closure | Open PASS / CONDITIONAL / HOLD items have a final controlled disposition. | Issue list, deviation record, corrective-action closure or customer approval. | A required open item has no final status or approval authority. |
| Dimensional / CTQ Records | Required inspection evidence matches the final approved revision and sample condition. | FAI, ISIR, CMM or other project-required dimensional report. | Inspection evidence belongs to an outdated drawing, tool revision or sample set. |
| Process / Run-Off Records | Final run-off or molding setup records represent the accepted release condition. | Process sheet, run-off log and approved parameter record where required. | Final samples cannot be linked to the documented run or setup condition. |
| Material / Tool Traceability | Required material, steel, treatment or component records match the approved tool state. | Material certificate, steel or hardness record, coating or heat-treatment record where required. | Required traceability is missing or does not match the final tool condition. |
| As-Built Engineering Data | Final engineering data reflects the released tool configuration. | 2D / 3D as-built data, insert list, revision record or approved change history. | Handover data does not reflect the actual final mold configuration. |
| Maintenance / Spare Information | Required service information supports the agreed handover scope. | Spare list, lubrication notes, maintenance information or hot-runner reference where applicable. | Customer-required service or spare documentation is incomplete. |
Mold Acceptance FAQ
These questions summarize the most common decision points around mold-tool acceptance, conditional approval, hold conditions and final sign-off.
Injection mold acceptance criteria are the project-specific conditions used to determine whether a mold can be accepted, conditionally approved, held or finally signed off. The criteria may cover dimensional and CTQ requirements, cosmetic limits, mold function, run-off performance, capability evidence where required, open-item closure and final handover records.
Mold acceptance defines what conditions must be satisfied for PASS, CONDITIONAL, HOLD or final sign-off. Mold validation defines what needs to be validated, when the evidence is collected and which validation activities support the defined release condition.
Not by that evidence alone. One acceptable sample may support part of the dimensional review, but final mold acceptance should consider the full agreed scope, including required CTQs, mold function, cosmetic requirements, run-off evidence and any customer-defined approval records.
No. Cp, Cpk, Ppk or other capability evidence should be required only when the customer specification, CTQ plan or approved quality requirement makes statistical capability part of the acceptance gate. There is no universal capability target for every mold or dimension.
Cosmetic limits should use the approved surface classification, defect rules, texture or finish requirement, viewing condition and reference or limit sample where applicable. Subjective visual judgment without an agreed boundary should not be used as the only basis for final sign-off.
CONDITIONAL approval may be appropriate when an open deviation or corrective action is clearly documented, its impact is understood, the permitted release scope is defined and the responsible approval authority has accepted the closure plan. It should not be used to bypass an unresolved critical requirement.
HOLD may be appropriate when a required CTQ is unresolved, cosmetic limits are exceeded, mold function is unreliable, run-off evidence is not representative, required capability evidence is missing or final records cannot be traced to the tool condition being approved.
The exact record package is customer- and project-specific. It may include final dimensional reports, run-off or process records, material or tooling traceability where required, issue-closure records, final as-built engineering data and maintenance or spare information for the agreed handover scope.
Share the current mold status and the requirements that will control approval. We can review the acceptance scope from dimensional and cosmetic criteria through mold function, run-off evidence, open-item closure and final handover requirements.
Final acceptance criteria, validation depth, inspection evidence and release authority remain subject to the customer specification, drawing, quality agreement and approved project plan.