色婷婷狠狠97成为人免费

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            sell pyromellitic dianhydride; 1,2,4,5-benzenetetracarboxylic anhydrid; PMDA

            pyromellitic dianhydride (1,2,4,5-benzenetetracarboxylic anhydrid) be used for preparation polyimide and epoxy resin material.

            pyromellitic dianhydride;

            1,2,4,5-benzenetetracarboxylic anhydride

            Molecular Formula  C10H2O6

            Molecular Weight  218.12

            CAS Registry Number  89-32-7

            Appearance:White powder

            Purity:99.5%

            pyromellitic dianhydride (1,2,4,5-benzenetetracarboxylic anhydrid) be used for preparation polyimide and epoxy resin material.


            色婷婷狠狠97成为人免费

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