My dad gave me his pump BB gun and I am trying to fix it. It's more sentimental to me than it's with worth, but it doesn't hold pressure. I am going to replace the o-rings but I am not sure what to get. I see on McMaster Carr many types(oil resistant, chemical resistant, polyurethane?, etc..) is there a particular type of material that is most desirable? I would consult the company but they don't exist. Any advice would be appreciated. Thanks
O-Ring Material
- Thread starter rasorn
- Start date
I don't know how much heat you create when pumping a "pumper" but I did try using urethane orings for my "oring sealed piston caps" made for my Beeman R9 and HW95 springers because urethane is a very tough abrasion resistant "rubber". Problem for urethane as an "oring sealed piston cap" was the fact that standard polyurethane has a very low tolerance for heat (-80°F to 200°F) and easily melts and it's a relatively expensive material. For my oring sealed piston caps I found that military spec 75 durometer Viton orings work well for my oring sealed piston caps and are rated at (-15°F to +400°/440°F). But for short working periods it will take even higher temperatures.
Anywhoo.....I guess the appropriate oring material is dependent on the "pumping" temp and pressure.
Anywhoo.....I guess the appropriate oring material is dependent on the "pumping" temp and pressure.
Upvote 0
i'm with nced I have found that VITON-75 works best for most cases where abrasion/wear become a factor
Upvote 0
Except VITON swells under contained pressure and why we DON'T use Viton in PCP servicing.
Just an FYI
Upvote 0