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O-Ring
Information & Duro-meter
Hardness
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This is an example of hardness as
the quality and hardness will very from one manufacture to another
according to the compounds used |
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Shore 00 |
20 |
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30 |
35 |
40 |
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50 |
55 |
60 |
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70 |
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80 |
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90 |
95 |
98 |
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Shore A |
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10 |
20 |
|
30 |
35 |
40 |
50 |
|
60 |
70 |
80 |
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90 |
95 |
100 |
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Shore D |
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|
19 |
22 |
29 |
35 |
|
45 |
55 |
|
65 |
|
75 |
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Softest |
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Medium |
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Medium Hard |
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Hardest |
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Rubber band: 35 Shore A
Rubber tire: 55 Shore A
Rubber shoe heel: 70 Shore A
Tool Box Wheel: 95 Shore A |
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Buna-N
(Nitrile/NBR)
Abrasion Resistance Good
Tearing
resistance Fair
Temperature range: -30 F to +230 F*
Synthetic Lube Resistance good
Compression Set
resistance
Fair |
One of the most common seals in airguns
Black in Color
The higher/Harder 70-90 duro, compression set
is affected
I have successfully used Buna-N in sub zero temperatures 70 duro holding
up better then the 90 |
Viton
(Fluorocarbon)
Compression set low.
Temperature range: -20 F to +400 F* |
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Viton ETP
(Viton Extreme)
Excellent chemical resistance vs. standard Viton
Other properties
similar to
standard Viton®.
Basic temperature range: -5 F to +400 F* |
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Silicone
Compression set
resistance Good
Poor tear and abrasion
resistance strength.
Poor resistance to oils.
Temperature range: -65 F to +400 F* |
Not much use for this ring in airguns
Red In Color |
EPDM / EPR
(Ethylene Propylene)
Compression set
resistance Good
Abrasion resistance Good
Temperature range: -65 F to +250 F* |
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PTFE
Excellent
temperature range.: -250 F to +450 F*
Various chemical and fuel resistance.
Low coefficient of friction.
Non-elastic.
Excellent tear and abrasion strength
Compression Set is Fair |
White in Color
Good for CO2 wet or dry
Some are replacing this ring with Buna-N 90
|
Neoprene
(Chloroprene)
Good resistance
to petroleum oils.
Low compression set and good
abrasion strength..
Temperature range: -40 F to +225 F* |
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Urethane
(polyurethane)
Excellent
wear/abrasion resistance.
Tearing
resistance Good
Low compression set & chemical
resistance.
Basic temperature range: -20 F to
+180 F* |
Do not require Back-Up Rings. Excellent Wear & Tear Resistance,
1000 to 3000 Pounds Max PSI Depending on Rating 00-70/00-90 |
Halocarbon Compatible
Silica Thickened
*Polymer Thickened
alkali, hydrofluoric and
fluorinating agent
SAFE
PTFE Thickened |
Ethylene |
Propylene rubber |
Polymides |
Polyvinyl alcohol |
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Polycarbonates |
Neoprene |
Flurosilicones |
Teflon plastics |
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Cured epoxies |
Rigid PVC |
Urethanes |
Rigid CPVC |
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EPDM |
Viton plastics |
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