Glossary

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Delamination (Fabric) - The separation of the individual plies in a laminate.

Delamination (PSA) - The undesirable separation or buckling of the release liner from an adhesive layer usually in the parallel direction of the web. Most often found during high humid conditions causing the paper to grow.

Densified foam - Sometimes called felted foam, it is foam that has been permanently compressed through a precisely controlled thermal setting process.

Density - The weight in solids of a unit volume of material expressed in pounds per cubic foot (PCF) or grams per cubic centimeter (g/cm³). In other words, it is the ratio of the mass of a body to its volume.

Dielectric Strength - The maximum electric field that a foam rubber product can withstand without breaking down, usually measured in Kilovolts per centimeter. At breakdown, a considerable current passes as an arc, usually with more or less all decomposition of the material along the path of the current.

Dimensional stability - The ability of a foam material part to retain the precise shape in which it was fabricated.

Double Coated - A pressure sensitive adhesive consisting of a carrier with similar or dissimilar adhesives applied to both surfaces.

Dry Web Lamination - A lamination process using heat activated web adhesives.

Durometer - An instrument used to measure the hardness of a material. As a general rule, this method is not as accurate as compression deflection @ 25%. Types of durometers include Shore A, D and 00. The proper one to use for soft, cellular materials is Shore 00.