Paper masking
The actual weight of the paper, usually measured in pounds per thousand square feet, needs to be considered, as do the actual constructon of the paper and the type and coat weight of the adhesive, to ensure true value and maximum shelf life. Domestic suppliers generally provide high quality paper, which is extensible-the long fibers of the paper are able to expand and contract as the acrylic sheet is subjected to changes in ambient temperatures and humidity. However, most paper masked imported acrylic sheet is masked with a low quality "rice" paper which is not extensible and has lower tear or tensile strength making the product more difficult to remove.

The adhesive type and coat weight play an integral part in the product's ability to withstand tunneling or bubbling. Domestic suppliers use a proprietary blend of natural and synthetic rubber, applied evenly to ensure uniform adhesion. Low adhesive coat weight, a common problem on some emport paper masked acrylic sheet, is a leading contributor to reduced shelf life. As this adhesive dries out, it hardens, becoming more aggressive and diffucult to remove.

Paper masking is genrally the most expensive protective masking used on acrylic sheet, and has a limited shelf life. Paper masking is used on cell cast and extruded acrylic sheet.

For more information, contact Mike at Ultra Acrylics, Inc.