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| Three properties, shear resistance, tack and peel strength, generally characterized pressure sensitive adhesives (PSA). These properties are directly related to the PSA¡¯s response to the application of stress and may be measured using rheology. For example, tack describes the ability to spontaneously form a bond to another material under light pressures within a short application time. As the contact time increases, higher shear resistance and peel strength properties (related to a materials long time flow behavior) are found. A single rheological test is described to directly determine the response of a PSA to varying deformation times, related directly to its shear resistance, tack and peel strength behavior. |
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