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Search our extensive range of o-rings by entering the dimensions requested into the box below.

You can specify which material you require but if you are uncertain, choose 'Any Material' from the drop-down menu.

Polymax can also supply custom o-rings e.g. different sizes, materials, hardnesses and colours.

If you cannot find what you are looking for please call +44 (0) 1420 474123 or send an email to sales@polymax.co.uk

Enter a value for the inside diameter in mm. (e.g. 10 or 25.5)

Enter a value for the cross section in mm.

Search our extensive range of o-rings by entering the BS reference (also known as AS or Dash Number) in the box below. You can use the full reference as in 'BS001' or just the number, '001'.

If you are uncertain of the material you require choose 'Any Material', otherwise select it from the drop-down menu.

Polymax can also supply custom o-rings e.g. different sizes, materials, hardnesses and colours.

If you cannot find what you are looking for please call +44 (0) 1420 474123 or send an email to sales@polymax.co.uk


Material:  
Select a material to see technical properties and datasheets.

Description

Excellent resistance to weathering and ozone, water and steam, with good performance in castor and some phosphate ester based fluids. It's low and high temperature capability is good, having excellent resistance to set with good resilience. Also high temperature braking systems employing castor based fluids for mouldings subjected to weathering and ozone and for seals in chemical plant due to its good chemical resistance.

EPDM is particularly useful when sealing phosphate-ester hydraulic fluids and in brake systems that use fluids having a glycol or silicone base.

This results in a highly fluorinated elastomeric compound with exceptional temperature resistance, compatibility with a wide range of aggressive chemical combinations and outstanding resistance to permanent deformation.

Available with the following Approvals/Certifications. Please call for further information.

Downloads

Temperature Range

  • Up to 150°C (Intermittant)
  • Down to -45°C

Recommended temperature range -30°C to +125°C

Chemical resistance

  • Hot water and steam up to 149°C with special compounds up to 260°C
  • Glycol based brake fluids (Dot 3 & 4) and silicone-based brake fluids (Dot 5) up to 149°C
  • Many organic and inorganic acids
  • Cleaning agents, sodium and potassium alkalis
  • Phosphate-ester based hydraulic fluids (HFD-R)
  • Silicone oil and grease
  • Many polar solvents (alcohols, ketones, esters)
  • Ozone, aging and weather resistant

Not compatible with:
  • Mineral oil products (oils, greases and fuels)

Description

Nitrile (or NBR) O-Rings are most commonly available and are cost effective.Ideal for use as seals on pumps, drive belts, and other general engineering applications.
NBR is good for applications that need to withstand fats, greases and high temperature (+70°C).
For automotive applications requiring contact with petrol or diesel you may wish to consider Polymax Viton o ring kits

Available with the following Approvals/Certifications. Please call for further information.

Downloads

Temperature Range

  • Up to 120°C (Intermittent)
  • Down to -30°C

Avoid prolonged use at higher extremes

Chemical resistance

  • Many hydrocarbons
  • Fats
  • Oils & Gasoline
  • Petroleum based hydraulic fluid (HFD-R)

Generally attacked by:
  • Ozone
  • Esters
  • Retones
  • Aldehydes
  • Chlorinated
  • Nitro Hydrocarbons

Description

Silicone possess excellent resistance to temperature extremes. Silicone's retention of properties at high temperatures is superior to other elastic materials. Silicone has poor tensile strength, tear resistance and abrasion resistance.

Available with the following Approvals/Certifications. Please call for further information.

Downloads

Temperature Range

  • Up to 200°C (Intermittant)
  • Down to -60°C

Chemical resistance

  • Dry heat
  • High - aniline point oils
  • Chlorinated DI - phenyls
  • Food processing applications
  • Excellent ozone resistance.
  • Water (Low temperature only)

Not compatible with:
  • Most Petroleum fluids
  • Ketones (MEK, Acetone)

Description

FKM (Viton ®) O Rings have a low compression set and have high temperature and chemical resistance. More expensive than NBR O Rings.

The terms FPM, FKM and Viton® very often cause confusion and lead to incorrect interpretations. All of these designations actually stand for one single base material:fluoro rubber.

NORSOK approved compound also available on request.

Available with the following Approvals/Certifications. Please call for further information.

Downloads

Temperature Range

  • Up to 230°C (Intermittant)
  • Down to -20°C

Recommended temperature range -20°C to +200°C (avoid prolonged use at higher extremes)

Chemical resistance

  • Mineral oil and grease, ASTM oil No. 1, and IRM 902 and IRM 903 oils
  • Non-flammable hydraulic fluids (HFD)
  • Silicone oil and grease
  • Mineral and vegetable oil and grease
  • Aliphatic hydrocarbons (butane, propane, natural gas)
  • Aromatic hydrocarbons (benzene, toluene)
  • Chlorinated hydrocarbons (trichloroethylene and carbon tetrachloride)
  • Gasoline (including high alcohol content)
  • High vacuum
  • Very good ozone, weather and aging resistance

Not compatible with:
  • Glycol based brake fluids
  • Ammonia gas, amines, alkalis
  • Superheated steam
  • Low molecular weight organic acids (formic and acetic acids)
Chemical Compatibility

*The information in this chart should be used ONLY as a guide in selecting a material

Polymax o rings are manufactured according to ISO-3601-1 tolerance as listed in the table below. All sizes in millimetres.

For o-rings with internal diameters between 54 and 600 visit O-Ring Tolerances 54.84 ID to 600 ID

Cross Section
D2(mm)
Tolerances
D2 0.80 On Request
0.80 < D2 2.25 ±0.08
2.25 < D2 3.15 ±0.09
3.15 < D2 4.50 ±0.10
4.50 < D2 6.30 ±0.13
6.30 < D2 8.40 ±0.15
8.40 < D2 10.00 ±0.21
10.00 < D2 12.00 ±0.25
D2 12.00 On Request
Inside Diameter
D1(mm)
Tolerances
D1 1.71 ±0.12
1.71<D1 2.93 ±0.13
2.93<D1 4.17 ±0.14
4.17<D1 5.44 ±0.15
5.44<D1 6.72 ±0.16
6.72<D1 8.01 ±0.17
8.01<D1 9.31 ±0.18
9.31<D1 10.62 ±0.19
10.62<D1 11.94 ±0.20
11.94<D1 13.27 ±0.21
13.27<D1 14.61 ±0.22
14.61<D1 15.95 ±0.23
15.95<D1 17.29 ±0.24
17.29<D1 18.64 ±0.25
18.64<D1 20.00 ±0.26
20.00<D1 21.36 ±0.27
21.36<D1 22.73 ±0.28
22.73<D1 24.10 ±0.29
24.10<D1 25.47 ±0.30
25.47<D1 26.85 ±0.31
26.85<D1 28.23 ±0.32
Inside Diameter
D1(mm)
Tolerances
28.23<D1 29.61 ±0.33
29.61<D1 31.00 ±0.34
31.00<D1 32.39 ±0.35
32.39<D1 33.78 ±0.36
33.78<D1 35.18 ±0.37
35.18<D1 36.58 ±0.38
36.58<D1 37.98 ±0.39
37.38<D1 39.38 ±0.40
39.38<D1 40.79 ±0.41
40.79<D1 42.20 ±0.42
42.20<D1 43.61 ±0.43
43.61<D1 45.02 ±0.44
45.02<D1 46.44 ±0.45
46.44<D1 47.86 ±0.46
47.86<D1 49.28 ±0.47
49.28<D1 50.70 ±0.48
50.70<D1 52.12 ±0.49
52.12<D1 53.55 ±0.50
53.55<D1 54.98 ±0.51
54.98<D1 56.41 ±0.52
56.41<D1 57.84 ±0.53
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Viton® is a registered trademark of DuPont™