供应Ultradur PBT B4406G4玻璃纤维增强阻燃PBT ¥22.00 供应Ultradur PBT B4406G6玻璃纤维增强阻燃PBT ¥22.00 供应Ultradur PBT B4441G5玻璃纤维增强阻燃PBT ¥26.00 供应Ultradur PBT B4450G5玻璃纤维增强阻燃PBT ¥22.00 供应Ultradur PBT B4500FC食品级PBT ¥22.00 供应Ultradur PBT B4500挤出级PBT ¥22.00