When nylon filter mesh is converted into cut parts, bags or molded components, a purchase order based only on “100 micron nylon mesh” can produce avoidable disputes. Buyers need a controlled reference sample, an agreed specification and a lot inspection plan. The reference—often called a golden sample—should demonstrate the approved construction, but measurable acceptance criteria must still control production.
This guide applies to OEM purchases of nylon filter mesh, rolls and fabricated parts. It complements the existing guides on open area, heat setting, cut edges and roll inspection without creating another general mesh-size page.
What a golden sample can and cannot do
A signed sample can establish appearance, hand, color, edge style, seam layout, packaging and fit in the customer’s assembly. It is especially useful where drawings cannot easily communicate flexibility or finish. However, a sample is not a substitute for numeric limits on polymer grade, aperture, wire diameter, fabric thickness, width and dimensions.
Identify the approved sample with supplier, customer part number, revision, date, lot number and signatures. Store it in a clean, dry package and define a replacement date if aging, contamination or repeated handling could change it.
Build the specification sheet
| Item | Specify or agree |
|---|---|
| Polymer | PA6, PA66 or approved grade; do not use “nylon” alone |
| Weave | Plain or other defined construction |
| Aperture | Nominal value, tolerance and test method |
| Thread diameter | Nominal value, tolerance and measurement method |
| Open area | Calculated or measured basis |
| Fabric thickness | Method, measuring pressure and tolerance |
| Roll dimensions | Width, length, splice allowance and edge type |
| Fabricated part | Drawing dimensions, edge/seam, orientation and fit |
| Cleanliness | Visible defects, foreign matter and packaging controls |
| Traceability | Lot code, label content and certificate requirements |
For geometric relationships, use the open-area guide. If the polymer grade matters, reference the PA6 versus PA66 guide. Do not infer aperture from mesh count alone without thread diameter.
Define the lot
State what constitutes one production lot: for example, material from one yarn lot and one weaving/finishing run under the same settings. The supplier should declare when a shipment contains more than one lot and label rolls or packages accordingly. If fabricated parts combine several operations, retain traceability from incoming fabric through cutting, sewing or welding and final packing.
Sefar describes vertically controlled manufacture and full traceability in several process-filtration product families, illustrating the value of controlling material from yarn to finished filter. That is a supplier example, not an automatic claim about every nylon mesh. Buyers should request the traceability level actually required and offered.
Incoming inspection plan
- Verify label, purchase order, drawing revision and certificate.
- Check packaging integrity and contamination.
- Confirm roll or part count and lot identity.
- Inspect a defined sample quantity for holes, broken threads, stains, creases, edge damage and unwanted splices.
- Measure aperture, thread diameter, thickness and dimensions using the agreed method.
- Compare qualitative features with the golden sample under defined lighting and handling conditions.
- Record acceptance, rejection or deviation approval against the supplier lot.
The sampling level should reflect lot size, application risk and prior performance. Do not invent an AQL value after material arrives. If the customer uses ISO 2859, ANSI/ASQ Z1.4 or another sampling plan, state the inspection level and acceptance criteria on the purchase order and ensure it is appropriate for the characteristic being tested.
First article for converted parts
For a new bag, disc, tube or molded insert, approve a first article from production-intent material and tooling. Check critical dimensions, seam position, edge quality, flow orientation and fit in the real assembly. A flat fabric sample does not validate a finished seam or molded interface.
Review the cut-parts edge-quality guide and heat-setting guide when dimensions can change during conversion or temperature exposure.
Certificate and retention samples
Ask the supplier which values are tested per lot, which are certified from incoming material, and which are typical catalogue data. A Certificate of Conformity confirms compliance with the agreed purchase specification; it is not automatically a complete test report. If a measured Certificate of Analysis is required, list each reported characteristic and method.
Define whether supplier and customer retain samples, how much material is kept and for how long. Retention samples help investigate future complaints, but they must remain identified and protected from moisture, light, heat and contamination.
Request an OEM sample package
Get OEM Pricing by sending the drawing, polymer, aperture, thread diameter, roll or part dimensions, annual quantity, first-article quantity, inspection method, certificate needs, packaging and sample-retention requirements. Ask INCE to return a proposed control plan and labeled trial lot.
FAQ
Can a golden sample replace a drawing?
No. Use it for agreed appearance and handling attributes, while drawings and measurable limits control dimensions and performance-related characteristics.
Should every roll have a separate certificate?
That depends on lot definition and the agreed documentation plan. Each roll should remain traceable to the certified production lot.
What data should a nylon mesh COA contain?
Only require values that are meaningful and measured by agreed methods, such as aperture, thread diameter, thickness, width or other critical characteristics.
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