Thread: DISA 0 Ring
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Old 02-25-2011, 08:00 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
Posts: 20,539
Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by champaign777 View Post
what is not clear ?
EDIT: Updated as new information comes in.

So far, it looks like the closest "standard" O-ring size for the M54 engine is "o-ring -136 silicone".

BMW E39 DISA O-RINGS:
  • BMW E39 528i (M52TU engine)
    • DISA O-RING 50mm x 3.5mm (BMW P/N: 11617504543), green (champaign777)
    • DISA O-RING 50mm x 3.2mm (BMW P/N: 11617504543), green (pleiades)
  • BMW E39 525i & 530i (M54 engine)
    • DISA O-RING 51mm x 2.5mm (BMW P/N: none), red 450F silicone (champaign777)
  • BMW E39 540i (M62 engine)
    • DISA O-RING ??mm x ??mm (BMW P/N: ?), color?
NOMINAL SIZES: NOTE: We need more measurements to error out the inaccuracies!
  • Measured
    • 50mm ID x 3.2mm cross section (pleiades)
    • 50mm ID x 3.5mm cross section (champaign777)
    • 51mm ID x 2.5mm cross section (champaign777)
  • Reference SAE Aerospace Standard 568
    • -226 50.390.46mm ID x 3.530.10mm cross section (nominal 2-1/4" OD, 2" ID, 1/8" CS)
    • -136 50.470.43mm ID x 2.620.08mm cross section (nominal 2-3/16" OD, 2" ID, 3/32" CS)
SUPPLIERS:

POSSIBLE MATERIALS (most likely ordered first):
  • Silicone
    • This polymer has both excellent heat and low temperature capabilities.
    • This material should be used as a static seal, because it has poor tensile and tear strength.
    • Basic Temperature Service Range: - 80F (-112C) to 400F (204C)
    • In Typical Applications O-rings Come Into Contact With: Dry Heat, Oxygen, Medical, Low Temperatures.
  • Fluorocarbon (Viton, Fluorel)
    • This polymer provides excellent resistance to temperature and chemicals.
    • Fluorocarbon possesses low gas permeability, low compression set, and good mechanical properties.
    • Basic Temperature Service Range: - 20F (-29C) to 400F (205C)
    • In Typical Applications O-rings Come Into Contact With: Chemicals, Heat, Fuels, Diester Lubricants, Halogenated Hydrocarbons (above 212F).
  • TFE Encapsulated (PTFE-FE) Silicone or Viton Core
    • These seals combine the chemical qualities of PTFE with the compression set of the rubber core encapsulated.
    • Basic Temperature Service Range: - Established by the rubber core.
    • In Typical Applications O-rings Come Into Contact With: Heat, Chemicals
  • BunaN (Nitrile NBR)
    • This polymer has good resistance to hydrocarbons, petroleum, fuels, water (212F), and ethylene glycol.
    • It is poor in its resistance to ozone, weathering, and sunlight.
    • Basic Temperature Service Range: - 40F (-40C) to 250F (122C)
    • In Typical Applications O-rings Come Into Contact With: Petroleum, Hydraulic Fluids, Water (212F), Grease, Transmission Fluid.
  • Aflas
    • This polymer has similar media compatibilities to EPR.
    • However, it is compatible with and resistant to degradation due to contact with petroleum products.
    • Basic Temperature Service Range: - 20F (-29C) to 400F ( 205C)
    • In Typical Applications O-rings Come Into Contact With: Petroleum Fluids, Steam, Ammines, Brake Fluids, Phosphate Esters.
  • EPR (EPDM) Ethylene Propylene Rubber
    • This polymer has good resistance to ozone, weathering, and sunlight.
    • EPR possesses good heat resistance and low compression set.
    • However, it is not resistant to petroleum products.
    • Basic Temperature Service Range: - 65F (-54C) to 300F (149C)
    • In Typical Applications O-rings Come Into Contact With: Steam, Hot Water, Chemicals, and Alcohol.
  • Neoprene (Chloroprene)
    • This polymer is good in oil, ozone, and weathering.
    • It is excellent in refrigerants such as Freon, but not good in phosphate esters, keytones, or brake fluids.
    • Basic Temperature Service Range: - 65F (-54C) to 250F ( 121C)
    • In Typical Applications O-rings Come Into Contact With: Freon, Air Conditioning Refigerants, Oils.
  • REFERENCE:
Silicone: Excellent material for static service at extreme (hot or cold) temperatures.
Outstanding flex and fatigue life. Very good for ozone and UV radiation service as well as
for resistance to fungal and biological attack.

Limitations: Avoid chlorinated solvents, aliphatic and aromatic hydrocarbons and petroleum oils. Silicones are generally very permeable to gases and have poor physical strength and abrasion resistance.
Chemistry: Methyl disiloxane, with vinyl- and/or phenyl-groups.
Trade Names: SILASTIC , SILPLUS
ASTM D1418 Designation:MQ, PMQ, VMQ, PVMQ
ASTM D2000/SAE J200 Type, Class: FC, FE, GE
Temperature Range: 115 to 232C (175 to 450F)
Typical Uses: LPCVD/Oxidation, Dry Etch, Resist Stripping

Standard Silicones (VMQ)
*******> ********>
Compound# Color Hardness
Shore A
Tensile
Mpa (Psi)
Elongation % 70Hr C/S
@ 150C
Low Temp High Temp
S1000 Orange 70 5.5 (815) 200 17 115C (175F) 200C (400F)
* Silicone is available in a wide range of Durometers and Colors
High-Temperature Silicone (VMQ)
*******>********>
Compound# Color Hardness
Shore A
Tensile
Mpa (Psi)
Elongation % 70Hr C/S
@ 200C
Low Temp High Temp
S1015 Orange 68 6.5 (940) 170 36 70C (94F) 246C (500F)
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Last edited by bluebee; 02-26-2011 at 09:27 AM.
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