These Class 300 Forged Steel Raised Face Blind Flanges (Series RFB-30) are manufactured to ANSI B16.5 and ASTM A-105 standards, and are stronger than cast flanges. These forged steel raised face flanges are used for sealing off piping systems and is rated for use in high pressure and high temperature applications. Notes:a. Dimensions and Tolerances per ANSI B16.5.b. Flanges are painted black.c. ASTM A-105.