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

Source: https://www.landee.cn/class-900-lb-weld-neck-flange-asme-b16-5-a105-4-inch-rtj.html