
Adhesive or glue is a compound in a liquid or semi-liquid state that adheres or bonds items together. Adhesives may come from either natural or synthetic sources. Some modern adhesives are extremely strong, and are becoming increasingly important in modern construction and industry. The types of materials that can be bonded using adhesives is virtually limitless, but they are especially useful for bonding thin materials. Adhesives usually require a controlled temperature to cure or set. They can be electrically and thermally conductive or nonconductive. The earliest date for a simple glue is 200,000 BP and for a compound glue 70,000 BP.
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Top Chinese leaders including President Hu Jintao on Saturday visited an exhibition showcasing the achievements New China has made in the past six decades. [Read more] |