On the fire side of the boiler gasketing is usually done with fiberglass rope or tape. This can handle temperatures of more than 1,000°F. Another option is graphite foil, often formed into a spiral wound gasket for sealing flanges. Kemtron stocks a wide range of spiral wound gaskets for all your boiler maintenance requirements.
We also supply the Fishbone Gasket as an alternative to Spiral Wound Gasket. The Fishbone Gasket has a lower leak rate and will improve the efficiency of the boiler.
On the water side the primary consideration is tolerance to steam. Secondary requirements are good tensile strength, (to resist the internal pressures,) and resistance to corrosive acids and water treatment chemicals. Heat and oxygen tend to oxidize many elastomeric gasket materials, and this should also be considered when selecting boiler gaskets.
All-in-all, the water side environment usually leads to EPDM gaskets. They have a wide temperature range, good compressibility, and the excellent steam resistance that’s needed.
Contact Kemtron Gaskets and Seals for all your boiler maintenance requirements.