Product Name: ASTM A105N Blind Flange, Carbon Steel
Standard: ASME B16.5
Material: Carbon Steel ASTM A105N, Normalized
Size Range: 1-8 Inch, DN25-DN200
Class Rating: Class 150-2500 LB, PN20-PN420
Facing: Raised Face (RF)

Source: https://www.landeeflange.com/asme-b16-5-blind-flanges-astm-a105n-1-8-in-cl150-2500-rf.html