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 ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
6. Other Substitute Fibers<br />
Other fiber products made from cellulose, phosphate, or ceramic fibers<br />
have very small market sh<strong>are</strong>s and <strong>are</strong> not seen as viable replacement for<br />
asbes<strong>to</strong>s in general service <strong>are</strong>as at this time. Ceramic fibers have been <strong>used</strong><br />
for packing <strong>materials</strong>, but do not see widespread-use due <strong>to</strong> their abrasive<br />
nature and brittleness (Union Carbide 1987). Phosphate fibers may see an<br />
increased market sh<strong>are</strong> in the future, but currently <strong>are</strong> only in developmental<br />
stages 4 (Monsan<strong>to</strong> 1987). Cellulose fibers occupy a very limited market sh<strong>are</strong><br />
although for applications<br />
demanding little in the way <strong>of</strong> high performance they<br />
can be <strong>used</strong> (ICF l986a).<br />
E. Summary<br />
It appears that<br />
substitutes for asbes<strong>to</strong>s containing packings currently<br />
exist. These products, however, cost more <strong>to</strong> produce and may not perform as<br />
well.<br />
Since no across the board substitute fiber exists, manufacturers have<br />
been forced <strong>to</strong> replace asbes<strong>to</strong>s with a combination <strong>of</strong> substitute <strong>materials</strong>, -<br />
including graphite, PTFE, glass, aramid, and FBI fibers. The substitute<br />
<strong>materials</strong> <strong>are</strong> a combination <strong>of</strong> fibers and fillers<br />
designed on an applicationby-application<br />
basis. The <strong>materials</strong> <strong>are</strong> classified by the fiber with the<br />
highest content. Table 5 summarizes the characteristics <strong>of</strong> the asbes<strong>to</strong>s<br />
substitutes.<br />
The estimation <strong>of</strong> market sh<strong>are</strong>s, prices <strong>of</strong> the substitute formulations in<br />
the event <strong>of</strong> an asbes<strong>to</strong>s ban,<br />
and data inputs for the Asbes<strong>to</strong>s Regula<strong>to</strong>ry Cost<br />
Model <strong>are</strong> summarized in Table 6.<br />
~ Although these fibers seem promising there is little industry data on<br />
their performance in field applications.<br />
- 18 - -