If you’ve ever been burned by a graphite gasket of the Flexitallic Thermiculite...

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  • If youve ever been burned by a graphite gasket thatcouldnt take the heat, your solution is Thermiculite.

    Flexitallics new Thermiculite* sheet gasketwill not oxidize, even at temperatures up to1600F.

    This graph illustrates that, unlike graphite, the load loss atoperational temperatures does not increase with time.

    G R A P H 1Thermiculite Relaxation vs. Temperature inComparison with Data from Graph 3(All data generated by TTRL)

    FLEXITALLICS new high-temperature, sheet-sealing material iscomprised of chemically exfoliated and thermally exfoliated vermi-

    culite on a tanged, 316 stainless steel core.

    This revolutionary new product simulates the structure of

    exfoliated graphite but with one notable exception . . . Thermiculite

    Gaskets by Flexitallic maintain their integrity, even at extreme


    Thermiculite is thermally stable, ensuring against thermal

    oxidation (see Graph 2).

    Independent testing at TTRL, Montreal (see Graph 4) shows

    that Thermiculite has excellent sealing properties.

    * Patented and patents pending

    Oxidized graphite sheet gaskets like thisone have been a common sight since thereduction in the use of asbestos. Flexitallicrose to the challenge of creating an alter-native to graphite soon after aWestinghouse paper was presented at the1990 Boston, MA ASME/IEEE PowerGeneration Conference (Evaluation ofAsbestos Free Gasket Materials byW.F.Jones and B.B.Seth, Westinghouse,Power Generation Technology and StrategicOperations Division). This paper limitedgraphite sheet material to 650F in fiveyears of service. This conclusion wascorroborated by the outcome of a PVRCproject at the TTRL (see Graph 3).

    Vermiculites thin, flexible, soft plates canbe exfoliated like graphite. They retain thesealability and low porosity of graphite, butFlexitallics new Thermiculite sheet gasketswill not oxidize at high temperatures.


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  • G R A P H 2Cumulative Iso-Thermal Weight Loss Results for the Bestand Worst Exfoliated Graphites Tested vs. ThermiculiteSheet Materials

    G R A P H 3Flexible Graphite Relaxation vs. TemperatureTTRL Data

    This graph illustrates the loss of load over time for graphite as afunction of temperature.

    This graph illustrates the minor weight loss of Thermiculite incomparison to the weight losses for the best and worst forms ofgraphite.

    Total freedom from Oxidation

    Superb level of tightness even at 930F

    Suitable for use up to 1600F

    Maximum recommended pressure is 2900 psi

    Excellent chemical resistance

    Easily cut and installed in the field

    Sheet sizes of 40 x 40

    Thickness range of 1/32 to 1/8


    G R A P H 4Independent Testing at TTRL Concludes ThatFlexitallics New Thermiculite Gasket OffersSuperior Sealability

    Room Temperature Tightness (ROTT) BehaviorCharacterization of the Flexitallic Thermiculite GasketStandard Test Method for Gasket Constants for Bolted JointDesign. Note the very high level of tightness achieved.


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    ThermiculiteTechnical Data