GTA
PCP - HPA - C02 Gate => QB-7X Gate -W/Co2 & HPA => : iconoclast January 12, 2009, 02:45:48 AM
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Does anyone know what the material/hardness for the original white O-rings used for the End Cap?
I know the tune guides state to use Viton, EPDM or urethane?
So far, I have tried Viton without much success.
The Viton I purchased swelled up and started crackling and popping upon removal.
I don't know if I got the wrong type of Viton or I got counterfit Viton.
I guess I will try EPDM next.
That's what Archer Airguns uses.
Also, O-ring/Seals 101 by Tim McMurry recommends urethane.
I'll try that too.
But, it would be nice to know what the OEM O-ring material/hardness is.
Thanks.
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Urethane is the only way to go and if I remember correctly, it is 90 Durometer.
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Thanks for your reply.
I also want to thank you for the extremely well written and easy to follow tune guide for the QB78.
I really had a lot of fun tuning my QB78 using your guide.
Your tune tips made a big difference in my QB78 performance.
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AS568A Dash Number
113
Type
O-Ring
O-Ring Type
Standard
Cross Section Shape
Round
Width
3/32"
Actual Width
.103"
Inside Diameter
9/16"
Actual Inside Diameter
.549"
Outside Diameter
3/4"
Actual Outside Diameter
.755"
Material
PTFE
Durometer
Extra Hard
Durometer Shore
Shore D: 55
Temperature Range
-100° to +500°F
Color
White
Specifications Met
Not Rated
I had the same thing happen to the viton o-ring in the cap, it was soft and looked about 3 sizes to big. When I heard the popping I didn't know were it was coming from at first. I am going to try these WHITE PTFE o-rings I'll let you know how they work out. They are rated excellent for resistance to abrasion and every chemical, oil, and gas listed on the Mc Master Carr chart.