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The Use of Butyl O=92rings is ok with some Oxygen applications, Viton my= be more compatible for diving due to cold water.. The use of Teflon tape is= also acceptable. When you see a torch being used in a environment that m= ay not appear clean keep in mind that the dirt is on the out side of the sys= tem. The interior of the tank is relatively clean as well as the regulator. Below is Information from the Parker O-ring handbook publication # ORD 57= 00 and Apple Rubber Products handbook. Parker can be reached at (606) 269-23= 51 apple at (800) 828-7745 another good source for O-rings is Precision Associates (612) 333-7464 the have one of the best O-ring catalogs I have= seen. If any one would like me to fax them the Chemical compatibles tabl= e for O-rings from Parker and Apple leave me you fax number FLUOROCARBON RUBBER (FKM) Typical trade names: Fluorel 3M Kalrex (high temp) E I duPont Kel-F 3M (formerly Kellogg) Viton E I duPont Technoflon Montedison USA ASTM D1418 Designation: FKM ASTM D2000/SAE J200 Type Class: HK Fluorocarbon elastomers were first introduced in the mid 1950's. Since t= hen they have grown to major importance in the seal industry. Due to its wide= spectrum chemical compatibility and temperature range and its low compres= sion set, fluorocarbon rubber is the most significant single elastomer develop= ment in recent history. Its working temperature range is considered to be -15=BA to +400=BA F (-2= 9=BA to +204=BA C), but it will take temperatures up to 600=BA F (316=BA C) for s= hort periods of time, and Du Pont's Kalrez is normally recommended up to 500=BA= F (260=BA C). On the low temperature end, Parker's compound V835-75 will se= al down to -40=BA F (-40=BA C) in a static seal. Though the standard compoun= ds have been known to seal at -65=BA F = (-54=BA C) in some special static applications, the normal low temperatur= e limit is -15=BA F (-26=BA C). Special formulations having extra chemical resistance are also available,= and new types are being developed constantly. Fluorocarbon o-rings should be considered for seal use in aircraft, automobile and other mechanical devices requiring maximum resistance to elevated temperature and to many functional fluids. FKM is recommended for: Petroleum oils Di-ester base lubricants (MIL-L-7808, MIL-L-6085). Silicate ester base lubricants (MLO 8200, MLO 8515, OS-45.) Silicone fluids and greases. Halogenated hydrocarbons (carbon tetrachloride, trichloroethylene). Selected phosphate ester fluids. Acids. FKM is not recommended for: Ketones (MEK, acetone). Skydrol fluids. Amines (UDMH), anhydrous ammonia. Low molecular weight esters and ethers. Hot hydraulic or chlorosulfonic acids. Limitation: Fluorocarbons are not recommended for exposure to ketones; amines; low molecular weight esters and ethers; nitro hydrocarbons; hot hydrofluoric or chlorosulfonic acids; or Skydrol fluids. They are also n= ot recommended for situations requiring good low temperature flexibility. Another viton experiment is: = ************************************************************************ Alex Varouxis Associated Design and Manufacturing Co. (V) 703.549.5999 (F) 703.548-0919 (H) 703.534-3408, E-mail avarouxis@ao*.co* E-mail alex1@ac*.di*.ne* = ************************************************************************
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