Separate sample roles
A master sample represents an approved state, a limit sample defines an accepted boundary and a defect sample supports training or investigation. Identify them separately. Link each to part number, revision, approved characteristics and approver, including what it does not represent.
Check continued fitness for purpose
Review color, tack or dirt, cracks, compression flattening, labels and packaging. Frequently pressed tactile samples may differ from sealed reserves. Use records help explain changes. Photographs record appearance but cannot fully replace touch, elasticity or three-dimensional size.
Link old and replacement samples
Validate the replacement against current specifications and obtain the agreed approval. Record why the old sample expired, the new sample's source, start date and workstations. Withdraw old working samples while retaining records so conflicting references are not used together. Resolve specification disputes before replacing the reference.
Project review checklist
| Sample type | Purpose | Misuse to avoid |
|---|---|---|
| Master sample | Recognize approved condition | Replacing every numerical dimension |
| Limit sample | Explain a defined boundary | Extending to unapproved defect types |
| Defect sample | Training and cause analysis | Mixing with accepted references |
Illustrative project example
A sticky aged limit sample can cause inspectors to accept increasingly sticky parts. Stop using it and review the approved record instead of turning sample aging into a new requirement.
Frequently asked questions
Does a customer's signature make a sample valid forever?
No. Revision and storage-condition agreements still apply; signatures do not stop physical aging.
What if only one approved sample exists?
Confirm its condition and purpose, then establish approved working and sealed reserve references where appropriate to protect the sole evidence.
Related product and project inquiry
Custom Shaped Silicone Parts · Silicone Shipment Documents: Matching Batches, Reports and Samples
For a custom part review, send the drawing, application, material or performance needs, key dimensions, quantity and target test conditions. Material, tooling and acceptance requirements are confirmed for each project.
