1. Define the target window first
Density, resilience, surface feel and process constraints should be written down before candidate selection. Otherwise the trial can become a unit-price discussion instead of a confirmation route.
2. Keep trial conditions repeatable
A practical evaluation route should control dosage, temperature profile, mixing or shear condition, and cell-structure review. The goal is to compare results against a stable baseline.
3. Connect foam behavior with final application
Foam consistency should be reviewed together with touch, migration, aging, odor and processing behavior when the material is used in interior or flexible PVC systems.