01
Functional requirement
Define mechanical, thermal, chemical, electrical, regulatory, appearance and service-life needs without choosing by family label alone.
Evidence route
Requirement basis and applicable test/standard list
Moulding material control
Injection-moulding resin selection: specify the exact material that the tool and product must prove.
A polymer-family name does not define grade, molecular characteristics, reinforcement, colour, additives, conditioning or substitution rights. PartVerity keeps resin identity linked to DFM, sampling, certificates, process settings and production lots.
Decision premise
Material question: which exact commercial resin and condition must every approved sample and batch represent?
Engineering control
Six controls for exact resin identity
Material selection begins with function and processing, then closes a purchasable, traceable and change-controlled specification.
02
Exact commercial grade
Record manufacturer, complete grade, reinforcement, additives, colour code and approved region/source where relevant.
Evidence route
Controlled BOM/drawing callout and technical datasheet revision
03
Incoming condition
Specify virgin/regrind rules, moisture or drying needs, packaging, shelf-life and contamination controls appropriate to the grade.
Evidence route
Purchase specification, receiving check and drying/material log
04
Tool and process interaction
Connect shrinkage, flow, temperature, abrasion, corrosion and venting implications to the actual tool concept and CTQs.
Evidence route
Resin-linked tool review and process-risk record
05
Certificate and lot link
Define what certificate, lot, colour or compliance evidence is required and how it links to trial and production parts.
Evidence route
CoC/CoA scope, lot genealogy and retained record
06
Substitution authority
Require a numbered change request comparing affected properties, validation, inventory and tool/process consequences before any alternative is used.
Evidence route
Approved deviation/change order and revalidation scope
Decision matrix
Material priority to evidence route
Examples support requirement closure; they do not declare grades equivalent or universally suitable.
| Design priority | Selection focus | Required evidence |
|---|---|---|
| Dimensional stability | Grade, filler, moisture, temperature and geometry | Exact grade plus conditioned trial results |
| Chemical exposure | Named media, concentration, temperature and duration | Compatibility basis and project-defined validation |
| Cosmetic colour | Base resin, colourant, texture and viewing standard | Controlled colour reference and lot identity |
| Regulated composition | Specific declaration and supply-chain scope | Applicable supplier declaration/certificate |
| Alternative supply | Property and process delta, not family-name similarity | Approved comparison and revalidation decision |
Claim boundaries
Material statements that are incomplete
‘ABS’ or ‘nylon’ is not a complete purchasing specification.
A datasheet typical value is not a lot-specific result.
Visual similarity does not prove grade or colour compliance.
A substitute cannot inherit sample approval without authorised review.
Technical context
Use guidance to frame the review—not to replace project evidence.
External context for material families, grades, fillers and geometry interaction. The controlled commercial grade and project validation remain authoritative.
Fictiv injection-moulding design guide