略語大辞典 [Mat] 30 PWA platelet white alumina 白色アルミナ板. 半導体の研磨仕上げ材.platelet white alumina; a white calcinedalumina abrasive; permits finishing to aflat, scratch-free surface; [Mat:Mech:C:Ind]. 丸善「略語大辞典」JLogosID : 11857088