Specification comparison works only when buyers compare the same test method, diameter, tolerance and delivery basis. A low headline number can be meaningless if the sample, conditioning or acceptance rule differs. Build a comparison sheet before requesting quotations.
Normalise the data
- Confirm material grade and colour.
- Match diameter, tolerance and spool format.
- Check whether properties are typical or guaranteed.
Compare commercial terms
- Ask for batch data, packaging and lead time.
- Define the acceptance method and claim route.
- Separate sample performance from series performance.
Document the decision
Use one scorecard for all suppliers. Keep source documents, test conditions and unanswered questions with the quotation.
| Comparison area | Question for the supplier | Evidence to request |
|---|---|---|
| Material | Which grade and formulation? | TDS and batch record |
| Dimensions | Which diameter and tolerance? | Measurement method |
| Performance | Typical or guaranteed value? | Test report and sample size |
| Supply | Packaging, MOQ and lead time? | Written commercial offer |
| Quality | How are deviations handled? | Inspection and claim procedure |
Common engineering mistakes
- Comparing different grades as if they were equal.
- Using a single sample as proof of series quality.
- Ignoring conditioning before testing.
- Mixing units or test standards.
- Accepting an unclear claim route.
Buyer checklist
- Are grades and colours matched?
- Are test methods identical?
- Are tolerances written down?
- Is batch evidence available?
- Is the claim process defined?
Share your comparison sheet with FilamentLab and we will identify the missing technical questions.