Invented by - Prehistoric Humans
Year - 200,000 Years ago, Italy
It is defined as ""A GLUE is any substance that, when applied to the surfaces of materials, binds the surfaces together and resists separation. Substances which are similar to glue are cement, mucilage, or paste. Glue is sometimes also referred as Adhesive.
The earliest use of adhesives was discovered in Italy. At this site, two stone flakes partially covered with birch-bark-tar and a third uncovered stone from the Middle Pleistocene era (circa 200,000 years ago) were found. This is thought to be the oldest discovered human use of tar hafted stones. More recent examples of adhesive use by prehistoric humans have been found at the burial sites of ancient tribes. Archaeologists studying the sites found that approximately 6,000 years ago, the tribesmen had buried their dead with food found in broken clay pots repaired with tree resins. Another investigation by archaeologists uncovered the use of bituminous cements in the fastening of ivory eyeballs to statues in Babylonian temples dating all the way back to approximately 4,000 BC
Adhesives may be found naturally or produced synthetically. The earliest use of adhesive-like substances by humans was approximately 200,000 years ago. From then until the 1900s, increases in adhesive use and discovery were relatively gradual. Only since the last century has the development of synthetic adhesives accelerated rapidly, and innovation in the field continues to the present.
The use of glue/adhesives offers many advantages over other binding techniques such as sewing, welding, bolting, screwing, etc. These advantages include the ability to bind different materials together, the ability to distribute stress more efficiently across the joint, the cost effectiveness of an easily mechanized process, an improvement in aesthetic design, and increased design flexibility. Disadvantages of adhesive use include decreased stability at high temperatures, relative weakness in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing.
It is defined as ""A GLUE is any substance that, when applied to the surfaces of materials, binds the surfaces together and resists separation. Substances which are similar to glue are cement, mucilage, or paste. Glue is sometimes also referred as Adhesive.
The earliest use of adhesives was discovered in Italy. At this site, two stone flakes partially covered with birch-bark-tar and a third uncovered stone from the Middle Pleistocene era (circa 200,000 years ago) were found. This is thought to be the oldest discovered human use of tar hafted stones. More recent examples of adhesive use by prehistoric humans have been found at the burial sites of ancient tribes. Archaeologists studying the sites found that approximately 6,000 years ago, the tribesmen had buried their dead with food found in broken clay pots repaired with tree resins. Another investigation by archaeologists uncovered the use of bituminous cements in the fastening of ivory eyeballs to statues in Babylonian temples dating all the way back to approximately 4,000 BC
Adhesives may be found naturally or produced synthetically. The earliest use of adhesive-like substances by humans was approximately 200,000 years ago. From then until the 1900s, increases in adhesive use and discovery were relatively gradual. Only since the last century has the development of synthetic adhesives accelerated rapidly, and innovation in the field continues to the present.
The use of glue/adhesives offers many advantages over other binding techniques such as sewing, welding, bolting, screwing, etc. These advantages include the ability to bind different materials together, the ability to distribute stress more efficiently across the joint, the cost effectiveness of an easily mechanized process, an improvement in aesthetic design, and increased design flexibility. Disadvantages of adhesive use include decreased stability at high temperatures, relative weakness in bonding large objects with a small bonding surface area, and greater difficulty in separating objects during testing.
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