2026-04-13 ASME B16.5 Class 300 flanges: types, materials, sealing faces (FF, RF, RTJ), and dimensions for WN, SO, SW, TH, LAPJ, BL. Suitable for oil, gas, chemical, power, pharma, food. Moderate pressure (150-300 psi), easy install, good sealing. Professional flange manufacturer offers carbon steel, stainless steel, alloy, duplex. Improve piping reliability.