HENSOMASTIK® Mixed Penetration Seal systems are used as penetration seals for metal pipes, flammable pipes and electrical cables, thereby restoring the fire safety of wall and ceiling structures which have openings for supply lines. The HENSOMASTIK® Mixed Penetration Seal EI 90 / EI 120 is a system which consists of 2x >50 mm thick mineral fibre boards coated on the outsides with the HENSOMASTIK® 5 KS viskos fire protection coating.