Define the useful purity window
Set limits that reflect the synthesis route and downstream product requirements.
CHDM / PETG
DMT feedstock for demanding synthesis routes
High-consequence applications benefit from a staged qualification plan linking feedstock evidence to process and product outcomes.
OVERVIEW
Build a defensible qualification
Start with the critical quality attributes, then confirm them through samples and batch data.
Protect optical performance
Evaluate color together with organic trace impurities and thermal history.
Review catalyst-sensitive traces
Align ash and metal controls with catalyst and process sensitivity.
Qualify progressively
Move from sample to pilot lot with agreed release documents and acceptance rules.
PROJECT CHECKLIST
What to confirm
Application-specific specificationRepresentative and lot-specific COASample and pilot qualificationDocumented change control for recurring supply
FAQ
Frequently asked questions
What role does DMT play in CHDM and PETG production?
CHDM is commonly produced from DMT through a two-step hydrogenation route, and CHDM in turn is a key comonomer for PETG. Feedstock quality therefore propagates directly into hydrogenation performance and final copolyester quality.
Which impurities are most critical for hydrogenation feedstock?
Catalyst-sensitive traces dominate the risk: sulfur- and chlorine-containing species, metals and ash. These act as catalyst poisons, so limits should be aligned with your catalyst system and confirmed on representative batch data rather than typical values.
How should a CHDM/PETG project qualify a DMT source?
Agree the critical quality attributes first, review representative COA data, then run staged validation — sample, pilot lot, then recurring batches under documented change control — so each scale-up step is backed by evidence.
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Turn your requirements into a supply plan
Share your application, target specification, volume and destination — we’ll recommend the next practical step and arrange COA or samples.