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Animal glue, also known as industrial gelatin, skin glue, is the main component of adhesive.
It is a protein solid made from the partial hydrolysis, extraction and drying of collagen contained in animal skin, bone or tendon. Color is light yellow to brown.
It can soluble in water, slightly soluble in alcohol, insoluble in organic solvents. Its aqueous solution has surface activity and high viscosity.
When cooled, it will freeze into an elastic gel and returns to a solution when heated.
The latter is unique to animal gelatins and can be quantified in terms of gel strength, often referred to as freezing capacity.
This is the main physical property that determines the commercial value of animal gelatins, the rigidity of gels formed under standard conditions.
The value of commodities increases as the freezing force increases. The freezing force is measured by a special instrument called a luminance meter, expressed in grams.
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