Re: Re: Re: Re: Farmall A crankshaft pully

Posted by Vern-MI on October 23, 2002 at 13:14:42 from (206.148.229.140):

In Reply to: Re: Re: Re: Farmall A crankshaft pully posted by moonlite on October 23, 2002 at 11:13:29:

FLUOROCARBON RUBBER:

Viton® * E.I. dupont de Nemours Company
Fluorel * 3M
Kalrez® (high temp) * E.I. dupont de Nemours Company
Kel-F * 3M (formerly Kellogg)
Viton® or fluorocarbon elastomers were first introduced in the mid 1950's. Since then they have become of major importance in the seal industry. Due to its good chemical resistance, high temperature range and its low compression set, fluorocarbon rubber is the most significant single elastomer development in recent history. The working temperature range ifor Viton® is considered to be -15 to +400 degrees F (-29 to +204 degrees C), but it will take temperatures up to 600 degrees F (316 degrees C) for short periods of time. Du Pont's Kalrez® is normally recommended up to 500 degrees F (260 degrees C). On the low end, Viton® compounds have been known to seal at -65 degrees F (-54 degrees C) in some special static applications, however the normal low temperature limit is -15 degrees F (-26 degrees C). Fluorocarbon seals should be considered for seal use in aircraft, automobile, scientific instruments and other mechanical devices requiring maximum resistance to elevated temperature and to many functional fluids. They are widely used in diffusion pumps on vacuum systems and on vacuum flanges on mass spectrometers and electron microscopes. Viton® is recommended for most applications and Kalrez® is only used where the additional temperature range can be justified by the increased cost.

NITRILE OR BUNA N (NBR) Typical Trade Names:

Chemigum Goodyear Tire & Rubber Co.
Paracril Uniroyal
Hyvcar Goodrich Chemical Co.
Krynac Polysar, Ltd.
Ny Syn Copolymer Rubber & Chem. Corp.
Buna N or Nitrile, is a copolymer of butadiene and acrylonitrile. Acrylonitrile content is varied in commercial products from 18% to 48%. As the nitrile content increases, resistance to petroleum base oils and hydrocarbon fuels increases, but low temperature flexibility decreases. Due to its excellent resistance to petroleum products, and its ability to be compounded for service over a temperature range of -65 to + 275 degrees F (- 54 to +135 degrees C), Nitrile is the most widely used etastomer in the seal industry today. Most military rubber specifications for fuel and oil resistant MS and AN 0-rings require nitrile base compounds. It should be mentioned, however, that to obtain good resistance to low temperature with nitrile compounding, it is almost always necessary to sacrifice some high temperature fuel and oil resistance. Nitrile compounds are superior to most elastomers with regard to compression set or cold flow, tear and abrasion resistance. Inherently, they do possess good resistance to ozone, sunlight or weather but this can be substantially improved through compounding. However, since ozone and weather resistance are not always built in, seals from nitrile bases should not be stored near electric motors or other equipment which may generate ozone, or in direct sunlight.

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