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In optics, an index-matching material is a substance, usually a liquid, cement (adhesive), or gel, which has an index of refraction that closely approximates that of another object (such as a lens, material, fiber-optic, etc.).
Mastic asphalt, or asphalt, is a sticky, black and highly viscous liquid Mastic cold porcelain , or salt ceramic, is a traditional salt-based modeling clay. Mastic, high-grade construction adhesive commonly used to bond ceiling, wall, and floor tiles, plywood panels, concrete, asphalt, leather and fabric.
Liquid animal glue. The earliest evidence of human adhesive use was discovered in central Italy when three stone implements were discovered with birch bark tar indications. The tools were dated to about 200,000 before present in the Middle Paleolithic. It is the earliest example of tar-hafted stone tools. [4]
Such adhesives are used for example in automotive body shops. They allow the gluing of sheet metal parts with corrosion protection and drawing oils without previous cleaning; The curing of the adhesive takes place in the furnaces used subsequently for hardening the lacquer at temperatures between approximately 150 and 200 °C. [2]
Adhesive materials fill the voids or pores of the surfaces and hold surfaces together by interlocking. Other interlocking phenomena are observed on different length scales. Sewing is an example of two materials forming a large scale mechanical bond, velcro forms one on a medium scale, and some textile adhesives (glue) form one at a small scale.
The adhesive components in a liquid solution anchor themselves in irregularities on the substrate and eventually harden, providing sites on which to adhere. [6] Surface tension effects restrict the movement of the adhesive along the surface of the substrate, and is related to the thermodynamic work of adhesion by Dupre's Equation . [ 6 ]
Most glue sticks are designed to glue paper and card stock together and are not as strong as some liquid-based variants. They can be used for craft and design, office use, and at school. There are several varieties: permanent,washable, acid-free,non-toxic, solvent-free, and dyed (e.g. to see where the glue is being applied).
Butyl cyanoacrylate has been used to treat arteriovenous malformations [6] by application of the glue into the abnormality through angiography. In gastroenterology, butyl cyanoacrylate is used to treat bleeding gastric varices , which are dilated veins that occur in the setting of liver cirrhosis or thrombosis of the splenic vein . [ 7 ]