Waste vegetable oil
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Waste Vegetable Oil (aka Used Cooking Oil) is acidic oil from cooking. The acidity is in the form of free fatty acid, which is created by the water content of food being fried, and the high temperature of the oil. The more used the oil, the higher the free fatty acid content.
Oil that is exposed to oxygen for an extended time polymerises into a sticky, hard to remove goo. This can be removed from the surface of containers with petrol or isopropyl alcohol.
Waste oil needs to be stored and handled carefully as it can attract vermin such as rats, which can carry life threatening diseases.
Please see the Environment Agency and waste transfer notes page for advice on the proper collection, storage and documentation of waste oils.
Generally, waste vegetable oil can be stored for a year or more if kept in sealed containers free from water content.