Listed in Air Conditioning & Refrigeration
Pure ammonia gas is highly toxic to people and would pose a threat if the refrigerator were to leak, so all home refrigerators don’t use pure ammonia. You may have heard of refrigerants know as CFCs (chlorofluorocarbons), originally developed by Du Pont in the 1930s as a non-toxic replacement for ammonia. CFC-12 (dichlorodifluoromethane) has about the same boiling point as ammonia. However, CFC-12 is not toxic to humans, so it is safe to use in your kitchen. Many large industrial refrigerators still use ammonia. In the 1970s, it was discovered that the CFCs then in use are harmful to the ozone layer, so as of the 1990s, all new refrigerators and air conditioners use refrigerants that are less harmful to the ozone layer
Before anything goes in the freezer, make sure it is wrapped and/or packaged appropriately. This will vary according to the item you are freezing. Meats should be wrapped in plastic and foil, or in an appropriately sized freezer bag with excess air removed. Plastic storage containers should be appropriately sized for the contents — but not overfilled. Liquids expand with time and may push up that lid during initial freezing. Every once in a while check the seal on what is in the freezer to make sure all is still okay.
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