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Filtration Table of Contents
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Filter Supplier
Sealants used to provide a leak-free bond
between the filter pack and case installation must be
resistant to heat and moisture, noncombustible,
fire-resistant, or self-extinguishing, as well as capable of
maintaining a reliable seal under continuous exposure to
design operating conditions.
Rubber-based adhesives compounded with
chlorine or bromine to ensure self-extinguishing when exposed
to ignition are acceptable, but catalytically cured solid and
foamed polyurethanes containing additives for combustion
suppression are the sealants of choice for most filter
manufacturers.
Sealants may be required to maintain
their integrity over a wide temperature range. Filters
designed to operate at temperatures above 392 degrees
Fahrenheit (200 degrees Celsius) have been sealed with
compression-packed glass fibers and with ceramic cements
reinforced with glass fibers, and have been hardened
thermally. Compression-packed glass fiber seals are sometimes
found to be damaged after shipment. The ceramic seal is often
too brittle to withstand commercial shipment. Room
temperature vulcanizing silicone rubber sealants have been
used successfully at operating temperatures only slightly
lower than 392 degrees Fahrenheit (200 degrees Celsius).
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