Do not treat every adhesive layer as the same product
Finishing catalogs list blocking pads and anti-slip or protection products as separate items. Identify the job each proposed item performs in your process. Product names alone do not define an approved combination.
| Item to discuss | Question for the supplier |
|---|---|
| Blocking pad | Which block, lens surface and edging conditions is it intended for? |
| Anti-slip product | Where is it placed and which coating combinations are supported? |
| Protection layer | What surface is protected and how does it affect the interface? |
| Block / chuck | Which exact model and geometry does the recommendation cover? |
Request the complete sequence
Ask for written instructions identifying cleaning or preparation steps, layer order, application method and removal procedure. If two suppliers provide different layers, ask who has assessed the combined stack. Do not infer compatibility because each product works separately in another process.
Label trial configurations
Give each combination a configuration ID. Record every SKU and lot, the equipment model, lens material and coating. Change one variable at a time when investigating a problem, and retain the reference configuration for comparison.
If an additional layer is proposed to solve slippage, evaluate it under a controlled sample trial before changing production. Stop the trial when the lens shifts, a layer separates or visible damage appears. The appropriate response is to investigate with the equipment and consumable suppliers, not to stack additional unassessed materials.