One of many options for fireproofing an installation's openings is fire mortar mix. The lightweight substance bonds to concrete, metal (including aluminum and steel cable trays and metallic pipes), plastic, wood, cable jacketing, and combustible penetrants such as plastic pipes or insulated metallic pipes. 3M's mortar mix is free of MMMF (man-made mineral fibers) and uses a binder that isn't portland-cement based, while Specified Technologies SpecSeal uses a portland-cement compound.
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