Product Name: ASTM A105 Weld Neck Flange
Size: 4 Inch, DN100, 100 mm
Pressure Rating: Class 900 LB, PN150
Design Standard: ASME B16.5
Material: Carbon Steel, ASTM A105
Wall Thickness: SCH 40
Facing Type: RTJ

Source: https://www.landeeflange.com/astm-a105-wn-flanges-asme-b16-5-4-inch-cl900-sch-40-rtj.html