1 shall have a hardness equal to or less than that shown in Table 1. 2.4 Marking The outer surface of each gasket shall carry the manu- facturer’s name or identification trademark and gasket number prefixed by the letters R, RX, or BX, followed by the gasket material identification. Materials shall be identified as shown in Table 2. The gasket shall also be marked with an ASMEB16.20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the seal. 2.5 Dimensions and Tolerances Dimensions and tolerances for ring-joint gaskets shall be as shown in Tables 3 through 8 (Tables I-1, I-2, and I-3 of Mandatory Appendix I). 2.6 Surface Finish Types R and RX gaskets shall have a surface finish not rougher than 1.6 ?m (63 ?in.) roughness. Type BX
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