Black Max Boiler Manhole Gaskets


Compared to spiral wound gaskets, Black-Max® seals better with our Exfoliated Graphite and has much better recovery properties. It also weighs less than half of that of spiral gaskets, so they are easier to handle and you will save on freight charges. And while spiral gaskets require near-perfect conditions, Black-Max®gaskets seal on rough, pitted surfaces under less compressive load.




  • Temp: -400°F (-240°C) to +850°F (+454°C) in atmosphere, +1200°F (+650°C) in Steam
  • Pressure: 2000 psig (70 bar) | P x T 175,000 (6,000) 1/4″
  • M Factor 2 (Smooth Flange Surface) | Y Stress 900 psi (6 MPa) (Smooth Flange Surface)
  • Maximum Gasket Load 24,000 psi (165 MPa).

Ideal Applications for Black-Max®
Steam pressure Vessels  –  Liquid Treatment Vessels
Hot Water Heaters  –  Compressed air Tanks
De-mineralizers  –  Dryer cans in paper mills
Steam humidifiers  –  Water towers
Water purifiers  –  Water softeners
Make-up tanks  – De-aerators