Before sending material, provide its identity and batch, size and thickness, artwork, target colour, end use, environment, downstream fabrication, batch quantity and daily output, plus a written pass/fail method. After testing, preserve settings, photos, video, failed areas and a retained sample so the job can be reproduced.
Updated 24 September 2026 · Basis: SUNUSER sampling and material-application notes · Scope: purchase-validation method, excluding price and lead-time promises
Information to send
- Material name, supplier, batch, both faces, protective film and known coating;
- maximum size, thickness, batch quantity, daily-output target and placement method;
- source artwork, viewing side, transparent windows, white, colour and varnish requirements;
- indoor or outdoor use plus rubbing, cleaning, bending, cutting, drilling or assembly requirements.
Create comparable samples
- Keep an untreated control from the same batch and do not combine different batches in one conclusion.
- Label candidate cleaning or pretreatment methods and record product, batch, application and waiting conditions.
- Use the real file and layer order; do not approve clear, dark or reverse-view jobs with an unrelated sample.
Record print conditions
- Record the exact machine and proposed order configuration rather than transferring another machine’s result.
- Record file version, ink order, print mode, environment, measured time and operator.
- Capture overall and close-up images, the print process and the agreed adhesion or durability checks.
Approve and reproduce
- Judge against end use, not only the appearance immediately after printing.
- Retain passed and failed samples and record failure location, possible cause and every adjustment.
- Repeat critical checks after changes in substrate batch, pretreatment, ink or production method.
Frequently asked questions
Can photos replace sending the material?
Photos help with preliminary machine selection but cannot prove adhesion, colour, curing or fabrication performance. Purchase validation needs the real substrate.
Does one successful sample represent all future batches?
No. Batch, coating, contamination, environment and handling changes can alter the result.
Must the buyer’s own artwork be used?
Final approval should use the real file whenever possible because small text, gradients, transparency, white order and viewing direction affect the decision.