| 摘要 |
A chemical thermal pack which in the preferred embodiment has a sealed intermediate envelope filled with a powder that produces or absorbs heat when dissolved in water and a quantity of water separated from the powder by a membrane that may be ruptured readily. A relatively flat, sealed, flexible outer pouch slidably receives the filled intermediate envelope and a heat insulation sheet that is located along the inside of one major face of the pouch to retard heat transfer there when the pouch is squeezed manually to rupture the membrane. An insulated pack containing gel is also provided.
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