Approve a material substitution only after you compare the exact proposed change with the agreed specification and the approved sample, then confirm that relevant evidence covers every quality or claim the change could affect. A lower price or faster availability is a reason to consider a change, not a reason to approve it.
When your custom phone case manufacturer proposes a swap, the review has three parts. Record what is changing, check only what that change could affect, and log a clear decision before the run changes. If any affected point stays unresolved, keep the change pending.
Record the Proposed Change Against the Approved Baseline
Start by pinning down exactly what changes and what it is being compared against when working with your custom phone case manufacturer. A vague request like “new TPU supplier” cannot be reviewed against anything.
- Name the component. Identify which part of the case changes, such as the shell, bumper, button covers, lining, or coating. A swap in one part may not touch the others.
- Identify the proposed material and source. Record the specific material grade and supplier or source, not just a generic name. Note what is confirmed by supplier documents and what is still an assumption.
- Capture the reason, nature, and extent. Write down why the factory wants the change, what exactly differs, and how much of the product it touches.
- Set the affected run. Record the production run, effective lot, or start date the change would apply to.
- Pull the baseline. Attach the agreed material specification and the approved reference sample. List only the qualities and claims the change could affect.
- Flag any deviation. State whether the change departs from the agreed specification, and explain why or why not.
For a record structure, ODL’s supplier change form asks for the reason, nature, and extent of the change, whether it deviates from the established specification, and an approval or rejection with a date and comments. It comes from a different manufacturing context, so treat it as a useful model rather than a phone case standard.
Select Checks That Match the Material Change
Choose checks from the affected component, the approved specification, and your existing claims. A swap in a printed back panel raises different questions than a swap in the bumper, so no single test list fits every change.
Before you pick a comparison, name the attribute or claim at stake and its acceptance criterion. Then record what sample, document, or test result supports the conclusion, and what remains open.
Compare Appearance and Feel With the Approved Sample
Appearance and feel checks belong in the review when the specification defines them or when the changed component is one customers see or touch. Examples include color, finish, gloss, texture, or grip. Place the new sample next to the approved reference and record what you reviewed and what you observed. Use the tolerances already in your specification. If no tolerance exists for an attribute that clearly changed, mark it unresolved rather than inventing a pass.
Verify Fit on the Intended Phone Model
Fit is checked against the specific phone model the case is built for and your approved fit requirements. A different material can behave differently in the same mold, so put the new sample on the target device. Record the result and any difference from the approved sample, such as how buttons, cutouts, or edges line up. Note the method you used so the next reviewer can repeat it.
Substantiate Affected Performance and Compliance Claims
Each performance claim the change could affect needs its own evidence. Compare sample results or material-specific documentation with that claim’s existing acceptance criteria. A material name alone does not prove performance. If the criteria or the evidence are missing, the claim is unresolved.
Compliance depends on product category. For general-use, non-children’s products subject to applicable rules, CPSC guidance for general-use products advises retesting when a material change could affect an applicable rule or standard. Testing only the changed component may be enough when it does not affect other parts or the finished product’s compliance. If you rely on supplier component testing, the supplier must provide copies of its test results and a written copy of its reasonable testing program, and that information must give a high degree of assurance of compliance.
Children’s products follow separate rules. CPSC guidance for children’s products says a material change after initial certification that could affect applicable requirements calls for testing by a third-party, CPSC-accepted lab and a new Children’s Product Certificate after passing results. Component-only testing applies only when the change does not affect other parts or other applicable requirements. Neither rule set applies to every phone case, so confirm which category your product falls in.
Record a Conditional Decision Before the Run Changes
The decision follows the evidence, not the schedule. Log it against the specific change and run so production never proceeds on an undocumented assumption.
| Outcome | Condition | Next action |
|---|---|---|
| Approve | All affected requirements and claims resolved | Record approval, date, and evidence references |
| Approve with deviation | Spec difference accepted in writing by an authorized person | File the signed deviation with the change record |
| Request evidence or revised sample | Material identity, a result, or a claim still open | Ask for the specific missing item; keep change pending |
| Hold or reject | Proposal cannot meet the agreed requirement | Keep the approved material; ask for a new proposal |
A written deviation accepts a known specification difference. It does not cover unresolved evidence about an affected claim, so a deviation and a missing test result need separate handling. Carry the final decision, its basis, and the evidence references into the change record. That way the next run, audit, or claim question traces back to one file.
FAQs
What if the factory says the new material is “equivalent”?
Treat “equivalent” as a claim to verify, not a finding. Ask which specification points it matches and what documents or sample results show that. Anything without support stays an assumption in your record.
Does a new supplier for the same material count as a change?
It can. CPSC defines a material change to include a change in the source of component parts when that change could affect compliance with applicable rules. Record a source change the same way you would record a material swap.
Can production continue while we wait for test results?
Keep the affected change pending until the open item is resolved or an authorized deviation is recorded. The run can continue on the approved material if that is available.
Who should sign off on a material substitution?
Assign approval to someone with authority over the specification, often in quality or product development. Record their name, date, and comments so the decision has a clear owner.
