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Pressure-sensitive adhesive (PSA, self-adhesive, self-stick adhesive) is a type of nonreactive adhesive which forms a bond when pressure is applied to bond the adhesive with a surface. No solvent, water, or heat is needed to activate the adhesive.
Achieving this grade requires centering between 65/35 to 70/30 on the front of the card, while the back should have centering of at least 90/10 or better. 9 - Mint - The card might exhibit only one of the subsequent flaws: a minor printing imperfection, borders that are slightly off-white, or an exceedingly faint wax stain on the back of the ...
A small transformer potted in epoxy. The surface visible on the right is formed by the potting compound that has been poured into the plastic box. In electronics, potting is the process of filling a complete electronic assembly with a solid or gelatinous compound.
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Science Research Associates Inc. was founded in 1938 [1] with a trade and occupational focus. In 1957, it moved into individualized classroom instruction with the iconic SRA Reading Laboratory Kit, a format that they translated to mathematics, science, and social studies [ 1 ] commonly called SRA cards . [ 2 ]
[1] EVA is an elastomeric polymer that produces materials which are "rubber-like" in softness and flexibility. The material has good clarity and gloss, low-temperature toughness , stress-crack resistance, hot-melt adhesive waterproof properties, and resistance to UV radiation .
Ethylene-vinyl acetate (EVA) copolymers, low-performance, the low-cost and most common material for the glue sticks (e.g., the light amber colored Thermogrip GS51, GS52, and GS53). [9] They provide sufficient strength between 30 °C (86 °F) and 50 °C (122 °F) but are limited to use below 60 °C (140 °F) to 80 °C (176 °F) and have low ...
The chemistry of pressure-sensitive adhesives describes the chemical science associated with pressure-sensitive adhesives (PSA). PSA tapes and labels have become an important part of everyday life. These rely on adhesive material affixed to a backing such as paper or plastic film. [1]