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The moist heat hydrocollator pack is a silica gel-filled cloth envelope. The gel's primary characteristic is its capacity to absorb water several times its own volume and, when heated, produce a wet heat pack that lasts for thirty to forty minutes. An apparatus called a hydro-collator heats the hote packs. There are several forms and sizes for packs. The packs have a six-month shelf life. The hydrocollator pack needs to be replaced when the filler starts to wear out and leaks, clouding the water..