GASKET, KLNGR C4401, 4.000" 300# RF

The 13850RF062B0400 is a green Klingersil C-4401 Class 300 ring face Flange Gasket measuring a 4 inch nominal pipe size, a Class 300 pressure rating, and a thickness of 0.062 inch. This flange gasket compresses between two pipe flanges under bolt load to create a leak-tight joint. This item is further identified as NPS, 0.062 THK.

The material holds up against a broad range of process chemicals, elevated flange loads, and hydrocarbons. That behavior comes from the compound itself: Klingersil C-4401 is known for reliable sealing on flanges with modest surface finish and a calendered, compressed fiber structure bound with elastomer. Applications involving strong oxidizing acids in some grades or service beyond the published pressure-temperature envelope call for a different compound.

It sees regular use in pulp and paper, steam and hot water systems, and chemical processing.

This item is sold individually under part number 13850RF062B0400. Check the compound against your process media, pressure and temperature before committing to a design. APG supports cross-referencing from drawings, samples and competitor numbers when a listed size is not an exact fit.