What is Vermiculite Spiral Wound Gasket?
Vermiculite
spiral wound gasket is a critical service gasket designed for use in
applications involving high temperatures and aggressive chemical media.
And this style gasket is comprised of a spirally wound sealing element
composed of a metal winding strip tape in combination with a vermiculite
based filler material.
Service and Application
Vermiculite
spiral wound gaskets are suitable for use in a wide range of sealing
applications. They are capable of effecting a high integrity seal in the
most demanding environments and are particularly suited to applications
involving extremes of thermal or mechanical cycling. Typical
applications include superheated steam, strong oxidising media and
elevated temperature service.
Maximum recommended temperature : 980 oC (18000F)
Maximum recommended pressure : ASME B16.5 2500 lb
Construction:
Filler material: Vermiculite
Winding
strip: 304, 304L, 316, 316L, 316Ti, 310, 321, 347, 410, Inconel 600,
625, Monel 400, Titanium, Nickel, Incoloy 800 or 825
Centering
Compression ring: 304, 304L, 316, 316L, 316Ti, 310, 321, 347, 410,
Inconel 600, 625, Monel 400, Titanium, Nickel, Incoloy 800 or 825
Why we Use Vermiculite as the Filler of Spiral Wound Gasket?
Chemically
and thermally composed by expanded vermiculite makes it an excellent
filler material for use in spiral wound gaskets. This natural mineral
has an structure that simulates to exfoliated graphite, with one notable
exception – it maintains sealing integrity through a wide range of
extreme temperatures. It exhibits exceptional chemical resistance
Other Fillers of Spiral Wound Gasket
Flexible Graphite
High
purity flexible graphite with no binders or fillers. This provides an
excellent sealability and excellent resistance to a wide range of
chemicals. Its unique combination of low permeability, inherent
lubricity and compressibility makes this material be suitable for
critical gas and vacuum services.
PTFE
PTFE
is used as a filler material in gaskets where extreme chemical
inertness is required. PTFE is unaffected by any known chemicals except
molten alkali metals and fluorine precursors. Because of its low
permeability, PTFE is also frequently used as a filler material on our
spiral wound gaskets in vacuum applications.
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