Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. A material, such as glycerin (glycerol), sorbitol, triethylene glycol, etc., incorporated into an adhesive during manufacture to increase its flexibility, workability, or distensibility. The addition of the plasticizer may cause a reduction in melt viscosity, lower the temperature of the second-order transition, or lower the elastic modulus of the solidified adhesive. 2. A material added to the stock in the manufacture of a paper such as glassine, or used in the papermaking mixtures, to impart softness and flexibility. Usual papermaking plasticizers include glycerol, sorbitol, invert sugar, phthalic acid esters, various minerals oils, organic esters of phosphoric acid, and the like. (17 , 235 , 309 )

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