A-A-2681
Application for copies should be addressed to ASTM, 1916 Race Street, Philadelphia, PA 19103.
3. SALIENT CHARACTERISTICS.
3.1 Material.
3.1.1 Plastic sheet. Type I material shall be transparent cellulose acetate and Type II materials shall be polyethylene terephthalate conforming to Type I of L-P-504 and Type I of L-P-377, respectively, see 4.6.2. The thickness of the Type I cellulose acetate (uncoated) shall be a minimum of 0.0045 inch and a maximum of 0.0060 inch (see 4.6.4). The thickness of the Type II polyethylene terephthalate (uncoated) shall be a minimum of 0.0016 inch and a maximum of 0.0024 inch (see 4.6.4).
3.1.2 Adhesive coating. The underside of the matte surface and one side of the polished surface of the plastic sheet, as applicable, shall be evenly and uniformly coated with a minimum of 0.001 inch thick (dry) film of a pressure-sensitive adhesive. The adhesive shall have suitable characteristics of flexibility and tackiness for the purpose intended. The adhesive shall require no moisture, heat, or other preparation prior to use of the finished plastic sheet to develop manual pressure-sensitive adhesive.
3.1.3 Release paper (paper backing). The adhesive side of the plastic sheet shall be covered with a suitable release paper (paper backing). Removal of the release paper at the time of use shall not detach the adhesive nor shall it in any way interfere with the function of the plastic sheet. The paper shall show no fiber separation or detachment from the plastic sheet.
3.2 Sheet dimensions. The sheet shall be furnished in the sizes as specified (see 1.2 and 6.2), unless otherwise specified in the contract or order. The tolerance of length and width shall be plus or minus 1/16 inch (see 4.6.3). Adjacent edges of the sheet shall intersect at a 90 degree angle plus or minus 2 degrees.
3.3 Finish and color. The uncoated surface of type I, class 2 shall have a matte finish. The uncoated surface of type I, class 1 and type II shall have a polished finish. Unless otherwise specified, all types and classes shall be colorless (see 6.2).
3.4 Surface characteristics. The matte surfaces of the plastic sheet shall be capable of accepting the characteristics listed in 3.4.1 and 3.4.2.
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