The 耐火材料事業部 of 積水化学工業株式会社 manufactures Fiblock, a thin intumescent organic firestop material for sealing 防火区画貫通部 around pipes, cables and ducts. The range holds 国土交通大臣認定 区画貫通部 approvals — the putty-free Fiblock NEO system was certified under PS060WL-1338, with further approvals PS060WL-1339 and PS060WL-1340, PS045WL-1343 and PS060FL-1341 published on its certificate register. Many items additionally carry Japan Fire Equipment Safety Center evaluations.