略語大辞典 [Chem] 31 PMA pyromellitic acid anhydride 無水ピロメリット酸. ポリイミド原料単量体.pyromellitic acid anhydride; or PMDA(pyromellitic dianhydride); an organic monomer which polymerizes to form polyimide; e.g. PMDA-ODA(oxydianiline) PI(polyimide), an insulating layer material and an encapsulant for PGA(pin grid a 丸善「略語大辞典」JLogosID : 11856024