Why does a mix remain tacky after a material change?
A small-cup pot life result must be read with the ratio, container, batch mass and initial temperature. Heat builds differently in a bulk mix.
Monitor temperature rise and pot life at the planned scale
Verify resin epoxy equivalent weight and hardener active hydrogen equivalent weight. Within supplier limits, simulate the intended mix size and record temperature and workable time. Test a separate film for cure; thickening alone is insufficient.
Why does a large batch gel earlier than a cup with a one-hour pot life?
Record mix quantity and material temperature. Retest pot life against the supplier’s stated conditions. Protective epoxy coatings: Using the same resin and dry film thickness, compare adhesion, surface drying and water resistance. Epoxy repair bonding: Fix the substrate and mixed batch size. Record pot life and peel behavior after cure.
Checking Active hydrogen equivalent weight and Amine value
Active hydrogen equivalent weight (g/eq): State the active-ingredient or as-received product basis. Confirm the mix ratio using the resin epoxy equivalent weight. Amine value (mg KOH/g): List the titration solvent and endpoint. Pot life (min): State the resin, ratio, mixed quantity and temperature.
What to record
- Mix mass
- Initial temperature
- Mix ratio
- Temperature rise
- Working window
Technical references
Products and processes
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