▁form ▁of ▁v ap our ▁or ▁steam . ▁The ▁steam ▁r ises ▁and ▁hits ▁the ▁pl astic ▁bag ▁interior ▁on ▁the ▁un ex posed ▁side , ▁where ▁it ▁cond enses ▁back ▁to ▁water , ▁and ▁runs ▁back ▁down ▁to ▁cool ▁the ▁installation ▁below . ▁Batt - based ▁pill ows ▁are ▁held ▁in ▁place ▁by ▁compress ing ▁them , ▁allowing ▁fr iction ▁to ▁rest rain ▁them . ▁If ▁replaced ▁a ▁sufficient ▁number ▁of ▁times , ▁the ▁pill ows ▁will ▁retain ▁a ▁permanent ▁compression , ▁requiring ▁their ▁replacement ▁with ▁new ▁components . ▁ ▁For ▁the ▁fabric ▁bag ▁based ▁pill ows , ▁the ▁verm icul ite , ▁the ▁fabric ▁bag ▁and ▁the ▁graph ite ▁are ▁non comb ust ible . ▁The ▁graph ite ▁exp ands ▁but ▁forms ▁no ▁bond ▁with ▁anything ▁around ▁it , ▁unlike ▁the ▁res in - based ▁inst umes c ents . ▁There ▁is ▁also ▁no ▁significant ▁release ▁of ▁chem ically ▁bound ▁water . ▁Usually ▁the ▁b ags ▁are ▁not ▁entirely ▁filled ▁and ▁cannot ▁be ▁significantly ▁com pressed , ▁requiring ▁mesh ▁or ▁grid ▁install ations ▁to ▁stay ▁in ▁place . ▁ ▁The ▁F om ox - based ▁pill ows ▁int umes ce . ▁ ▁See ▁also ▁▁ ▁List ing ▁and ▁appro val ▁use ▁and ▁comp liance ▁ ▁End oth erm ic ▁ ▁Int umes cent ▁ ▁Min eral ▁w ool ▁ ▁Fir est op ▁mort ar ▁ ▁Pass ive ▁fire ▁protection ▁ ▁External ▁links ▁▁▁ ▁Wür th ▁P ill ows ▁D IB t ▁Appro val ▁ ▁Category : Pass ive ▁fire ▁protection ▁Category