Published 2026-07-15 · Updated 2026-07-15 · Demeto Technical Team
Baseline storage conditions
Use a cool, dry, ventilated warehouse away from open flames, heat sources, strong oxidizers and direct sunlight. DMT ships as general cargo without dangerous-goods warehousing, but persistently warm storage accelerates moisture pickup and caking.
Moisture is the main enemy
Polyester-grade DMT specifies moisture at 0.02% max. Damaged packaging or repeated opening lets material absorb moisture, which raises both moisture and acid value and destabilizes transesterification. Reseal opened bags immediately and use them first.
Packaging integrity on arrival
Inspect the outer packaging on receipt: liners intact, seals tight, no broken or damp bags. Lot labels must match the COA so batch traceability is preserved from warehouse to reactor.
Storage period and re-inspection
With intact packaging and compliant conditions DMT stores well over extended periods. For stock older than about twelve months, re-test melting point, moisture and acid value against the original COA before charging; matching results mean the material is fit for normal use.
First-in first-out and batch discipline
Rotate stock by lot number, avoid mixing batches in one stack and separate grades physically to prevent misuse. A simple ledger of lot, arrival date and destination makes any quality investigation an hours-level exercise.