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Stickers on a laptop, applied with pressure-sensitive adhesive. 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.
Stamp collectors have criticized the format, because the rubber-based adhesive used tends to yellow the stamps progressively. It makes stamps difficult to remove from covers, [1] and to save in mint condition, though self-adhesives of recent years have improved in these respects. Artistamps have also been issued in a self-adhesive format ...
Before postage stamps existed, people receiving letters would have to pay for them. The payment was based on how many papers were in the envelope and how far the letter had traveled. Rowland Hill came up with a solution of prepayment. This led to his invention of stamp gum in 1837. The world's first adhesive postage stamp was called the Penny ...
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The term adhesive refers to a sticky substance, while something that is self-adhesive implies that it will stick without wetting or the application of glue to the product. [ 2 ] One of the most familiar types of adhesive labels is the postage stamp, which was developed in Britain in the 1840s [ 3 ] and became popular in the United States within ...
In the United States, modern postal markings may appear in the form of yellow adhesive labels with the text printed on them. Many postal administrations now have the ability to print inkjet annotations directly onto a cover, either as a barcode for reading by other equipment, or as text.