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Wood glue is an adhesive used to tightly bond pieces of wood together. Many substances have been used as glues. Many substances have been used as glues. Traditionally animal proteins like casein from milk or collagen from animal hides and bones were boiled down to make early glues.
An adhesive can be defined as a substance that causes two surfaces to stick together. By this definition, the earliest "adhesive" could be considered to have been developed three billion years ago, when primordial cells produced a tacky outer membrane allowing them to stick to adjacent cells.
Within two years, phenolic resin was applied to plywood as a coating varnish. In the early 1930s, phenolics gained importance as adhesive resins. [23] The 1920s, 1930s, and 1940s witnessed great advances in the development and production of new plastics and resins due to the First and Second World Wars.
Resorcinol glue, Para tertiary butylphenol formaldehyde resin: synthetic resorcinol or similar is mixed with phenol to make a resin; cured by adding formaldehyde: offgasses phenol and formeldehyde phenol and formeldehyde are toxic, PTBPF causes contact allergies Temperature-, UV-, and microbe-resistant. No gap-filling; joint must fit tightly.
A package of J-B Weld, showing "hardener" (red tube) and "steel" (black tube of resin): equal amounts are squeezed from both tubes and mixed. The J-B Weld Company is an international company that produces epoxy products. The home office is based in Sulphur Springs, Texas. [1]
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Araldite adhesive sets by the interaction of an epoxy resin with a hardener. Mixing an epoxy resin and hardener together starts a chemical reaction that produces heat – an exothermic reaction. [2] It is claimed that after curing the bond is impervious to boiling water and to all common organic solvents.
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