Rev 2-17 A5089K
O-RING INSTALLATION & MATERIAL INFORMATION
All RIX part numbers for o-rings begin with a 123 prefix. This is followed by a second set
of 3 digits which corresponds to US Standard AS568 sizing.
RIX normally uses a Viton 70 durometer o-ring, in which case the part number will have a
“-5” suffix, such as 123-040-5. In many cases a 90 durometer is used, which is indicated
by an additional “-90” at the end of the part number, such as 123-040-5-90. Viton is
required for oxygen or high temperature service, and 90 durometer is often required in high
temp/ high pressure locations. For materials other than Viton a different suffix is used (see
chart below).
CAUTION: All o-rings used in O2 service must be Viton or Teflon. Buna o-rings are not
oxygen compatible and will sustain combustion, creating a high potential for explosion.
All o-rings, except for those located behind piston rings, should be lubricated with an
appropriate high temperature grease such as Krytox or Christo-Lube MGC-111 before
installation. Apply a thin coating by drawing the o-ring through your fingers. This will
extend the life of the seal and simplify installation.
CAUTION: O-rings used in oxygen service must be lubed with an oxygen compatible
grease (RIX P/N 45-1007, 45-19220 or equivalent).
All o-rings supplied for O2
service have an X prefix, and are oxygen cleaned and bagged to
maintain cleanliness. Never use a non-O2
cleaned part for oxygen service.
Standard o-rings available from hardware stores, etc. are usually Buna type and will fail
when used in high temperature or oxygen applications.
O-RING & BACK-UP RING MATERIALS
RIX PART NO. MATERIAL
O-rings 123-XXX-2, -2S Silicone
123-XXX-3 Teflon
123-XXX-5 Viton
123-XXX-7 Kel-F
123-XXX-9 Kal-Rez, Compound 2037
123-XXX-10 Viton with FDA approval
123-XXX-11 Viton V1289-75, Low temp (-50°F)
123-XXX-12 Parafluor Ultra, FF102-75
X123-XXX-5 Viton (OXYGEN CLEANED)
Back-up Rings 124-XXX-3 Teflon (split)
124-XXX-8 Teflon (solid)
Note: Some –7 o-rings are metal and some –9's are metallic C-rings. But these
P/N's take the form 123-XXXX-7 and –9 (FOUR X'S)
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