... 1,4,5,8-Naphthalenetetracarboxylic dianhydride mainly for the synthesis of high a high-grade dyes, pigments intermediates 1,4,5,8-Naphthalenetetracarboxylic dianhydride ... is a high-grade dyes, pigments intermediates, mainly for the synthesis of high ... powderPurity ≥97%Melting point≥300 1,4,5,8-naphthalenetetracarboxylic dianhydride