Product Name: ASME B16.5 Blind Flanges
Size: 20 Inch, DN500, 500 mm
Pressure: ANSI Class 150 LB, PN20
Design Standard: ASME B16.5
Material: ASTM A105, Forged Carbon Steel
Source: https://www.landeeflange.com/asme-b16-5-blind-flanges-astm-a105-20-inch-dn500-150-lb.html