供应日本井上PORON原材料,SRS-40P  SRS-48P SRS-70P HH48C ML-24 LE-20 SRS-32P  SRS-24P     海绵 SM-55  MF-55  ECS  UEI-3 UEI  F-2 F-4 F-6   E-4382  C-4505