hdi trimer  asahikasei  tpa-100 about: product class: isocyanate duranate tpa-100 by asahi kasei is a hexamethylene diisocyanate (hdi) trimer. it has high nco content and low cosvisity. acts as a curing agent for urethanes. offers superior weatherability, good chemical & abrasion resistance, good compatibility and drying properties. exhibits excellent color retention, weatherability and outstanding performance. applications of duranate...