ANSI BHMA A156.18:2000 pdf download.MATERIALS AND FINISHES.
1.1 ANSI BHMA A156.18 establishes finish test methods and code numbers for finishes on various base materials. It includes criteria for viewing comparative finishes to the BHMA match plates and establishes categories of finishes.
2. DEFINITIONS
2.1 Blackened: a surface treated to be light absorbing and not reflective.
2.2 Bright: a reflective mirror like surface.
2.3 Coating: Coating is the application, of organic or inorganic materials o, or the conversion ol surface of the base material, which is then termed a substrate for the changing of appearance, or protection or both. The topcoat when applied establishes the type of coating for test purposes. The top ( when transparent, is often referred to as a clear coat.
2.3.1 Organic Coating: Coatings with a material containing carbon compounds, excepting cyanides carbonates, and including mixtures of organic and inorganic materials.
2.3.2 Inorganic Coating: Coating with metallic or other noncarbonaceous materials or conversic the surface to an oxide.
2.3.2.1 Plating: Coating with a metallic deposit by chemical, electro-chemical, mechanics e 1 ectro-mechanical means.
2.3.2.2 Oxidizing: Coating by conversion of the surface of the base material to an oxide by add of oxygen or removal of hydrogen.
2.3.2.2.1 Anodizing (aluminum): Coating by electro-chemical process which converts surface (aluminum) metal to (aluminum) oxide due to reactions at the anode in an acidic solution.
2.3.3 Vacuum Applied Coating: Electrochemical or electrophysical deposition, operated in a vacuu deposit an adherent, dense, thin film coating.
2.4 Corrosion: Breakdown or eating away of the base material or substrate, not to be confused staining. Corrosion of brass or bronze material can be green, brown or pink corrosion; corrosion of ste stainless steel material is red rust, corrosion of aluminum or zinc base material is white.
2.5 Highlighted: a part of the finish is emphasized.
2.6 Matching Finish: Equivalent in color, texture, base material, overall aesthetics and appearance.
2.7 Relieved: Heightening the effect of a finish usually by application by an abrasive.
2.8 Satin: A smooth dull finish with or without a directional pattern.
2.9 Significant Surfaces: Surfaces of a product that are visible or exposed after the product are installed
2.10 Stain: Any obvious color change other than corrosion, which cannot be removed by rinsing with
water.
2.11 Substrate: See 2.3 Coating.
2.12 Unstable Finish: A finish that intentionally lacks sufficient protection to ensure consistent color,
texture, and appearance for the intended period of use.
3. FINiSH TEST METHODS AND CRITERIA
3.1 Control Method: These test methods do not predict the performance life of the finishes in actual use but are used as a quality control method to ensure consistent finish quality. Actual product components shall be used except where otherwise specified.
3.1.1 Significant Surfaces: Surfaces on which a controlled deposit ordinarily cannot be obtained such as holes, edges, recesses, bases of angles, and similar areas are exempt from the requirements for significant surfaces.
3.1.2 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 2.50 x 3.75 in (64 x 95 mm) and shall be 0.064 ± 0.004 in (1.6 ± 0.1 mm) thick. Other materials are permitted to be sped fled by the affected ANSI A 156 product standards.ANSI BHMA A156.18 pdf download.