Gaskets are materials used to seal one compartment of a device ...
Gaskets are materials used to seal one compartment of a device ...
Gaskets are materials used to seal one compartment of a device ...
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
6. Ceramic Fiber Mixtures<br />
Ceramic fibers, composed <strong>of</strong> alumina-silica blends <strong>are</strong> <strong>used</strong> in the<br />
manufacture <strong>of</strong> gasketing material <strong>to</strong><br />
replace compressed asbes<strong>to</strong>s sheet,<br />
although their performance has not been outstanding (Union Carbide 1987).<br />
These fibers impart high temperature resistance <strong>to</strong> gaskets made from them, but<br />
little information is available on the performance characteristics <strong>of</strong> these<br />
<strong>materials</strong>. Costs <strong>are</strong> expected <strong>to</strong> be the same as for other ceramic based<br />
products that can replace asbes<strong>to</strong>s products (two times as expensive), but it<br />
is unlikely that ceramic products will occupy more than five percent <strong>of</strong> the<br />
market in the event <strong>of</strong> an asbes<strong>to</strong>s<br />
ban (ICF estimate).<br />
E. Summary<br />
It appears that substitutes for asbes<strong>to</strong>s containing sheet gaskets<br />
currently exist. However, these products cost more <strong>to</strong> produce and may not<br />
perform as well. Substitute fiber formulations include aramid, glass,<br />
graphite, cellulose, PTFE, and ceramic fibers. The substitute <strong>materials</strong> <strong>are</strong> a<br />
combination <strong>of</strong> fibers and fillers<br />
designed on an application-by-application<br />
basis. The substitute <strong>materials</strong> <strong>are</strong> classified by the fiber with the highest<br />
content.<br />
The estimation <strong>of</strong> market sh<strong>are</strong>s and prices <strong>of</strong> the substitute<br />
formulations<br />
in the event <strong>of</strong> an asbes<strong>to</strong>s ban and the data inputs for the Asbes<strong>to</strong>s<br />
Regula<strong>to</strong>ry Cost Model <strong>are</strong> presented in Table 5.<br />
- 13 -