Chapter 1
I. Introduction
Adhesive is a substance that holds two materials together by natural adhesion.
Glue is a form of adhesive and an impure form of gelatin. It is also the oldest adhesives known to man, it also makes very strong joint but it is not water proof. Glue was by far the most important adhesive until the latter part of 19th century. Thee glue is made from animal bones (Encarta 97 Encyclopedia, Adhesive). It also contains casein which is present in milk to produce glue (Wikipedia Encyclopedia, Glue).
Casein is the chief protein in milk and separates as curd milk sours, or when acid is added. It is commercially produced in skim milk and is widely used in medicines, cosmetics, and ass a sizing for paper. It is also used in glue, casein, paints, and certain plastic articles such as buttons. Casein can be found in the dairy products such as cheese, milk, cream, butter and yogurt.
Yogurt is a smooth semi-solid dairy product......
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