BHMA A156-18:2016 pdf download.AMERICAN NATIONAL STANDARD FOR MATERIALS AND FINISHES
3.1.3 Test Specimens
Actual product components shall be used except where otherwise specified.Components without surfaces which are compatible with the prescribed test methods, shall use a finished flat test panel using substrate of the same base material of the actual product or component. The flat panels shall have a minimum exposed area of 2.50x 3.75 in (64 x 95 mm) and shall be 0.020 to .25 in (0.5 to 6.4 mm) thick. A painted or powder coated finish in several different colors, where each color is composed of all the same materials except for variations in tints, is considered to be one finish type for test purposes.
3.2 Salt Spray Test This test shall be conducted in accordance with ASTM B 117-11 Standard Method of Salt Spray (Fog) Testing. Parts shall withstand exposure for the time specified in the applicable ANSI/BHMA A156 Series Standard without base material or substrate corrosion or blistering exceeding one spot visible to the unaided eye per one square inch (25.4 square mm) of significant surface and without any spot larger than 1/16 in (1.6 mm) in diameter. The spread of corrosion on significant surfaces that originate from holes, edges, recesses,and bases of angles, shall not exceed 1/16 in. (1.6mm). Staining shall not exceed 5% of the significant surface area of the component under test and without any spot larger than 1/4 in. (6.4 mm) in diameter. 3.3 Humidity Test This test shall be conducted in a chamber with conditions as described in ASTM D1735-08, except that this test shall be conducted in a chamber having a 95%±5% relative humidity. The parts shall be allowed to stabilize at room temperature for 30 minutes before they are examined. Blistering or staining of the part shall not be visible to the unaided eye. The coating shall, within an additional 15 minutes, pass a pencil hardness test (see 3.4) as specified in the applicable ANSI/BHMA A156 Series Standard and shall pass the method B Cross-Cut Tape Test as defined in ASTM D 3359-09 Method for Measuring Adhesion by Tape Test using Intertape 51596 or Elcometer 99.
3.4.2 Abrade the lead with #400 grit sandpaper and finish with light pressure to minimize grooves in the abraded surface. The circular edge shall be sharp, not serrate, when inspected with 5X magnification after each abrading. Repeat the abrading as required until the inspected edge is sharp. By rotating the lead holder after each test either 180 or 120 degrees±1 degree, three tests maximum shall be performed per abrading.BHMA A156-18 pdf download.