1.1 This test method describes a shop or field procedure for determination of four roughness characteristics of surfaces prepared for painting by abrasive blasting. The procedure uses a portable skidded or non-skidded stylus profile tracing instrument. The three measured characteristics are: Rt, Rmax, and Pc.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.1.3 In general, this method should be limited