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Step 10Perspex Caps
Here we do the perspex top and bottom caps. I went with perspex (Plexiglas®) because it can handle decent temps and resists NaOh.
These are 15mm thick pieces with 2 seat grooves "tank cut" on the bottom plate and 1 seat cut for the outer tube on the top plate.
Nitrile rubber O-rings, also known as Buna-N are then placed into the seats and the tubes then seat against the o-ring sealing the gap as well as insulating the perspex from direct heat.
The nitrile has good resistance to acids and bases. It also offers excellent resistance to petroleum-based oils and fuels, water and alcohols. The temp range is -55ºC to 120ºC.
The front perspex piece has been flame-polished with my favourite gas, hydroxy, the rear one which is the bottom cap has been left alone for comparision.
The top cap in the foreground still needs to have a water fill port drilled inside each tube seat, the threaded hole is a standard ¼in BSP compressor fitting.
The bottom cap has been drilled and tapped for stainless steel M6 threaded rod.
Don't forget to use teflon plumbers tape on all threaded connections, it helps greatly with leak prevention.
These are 15mm thick pieces with 2 seat grooves "tank cut" on the bottom plate and 1 seat cut for the outer tube on the top plate.
Nitrile rubber O-rings, also known as Buna-N are then placed into the seats and the tubes then seat against the o-ring sealing the gap as well as insulating the perspex from direct heat.
The nitrile has good resistance to acids and bases. It also offers excellent resistance to petroleum-based oils and fuels, water and alcohols. The temp range is -55ºC to 120ºC.
The front perspex piece has been flame-polished with my favourite gas, hydroxy, the rear one which is the bottom cap has been left alone for comparision.
The top cap in the foreground still needs to have a water fill port drilled inside each tube seat, the threaded hole is a standard ¼in BSP compressor fitting.
The bottom cap has been drilled and tapped for stainless steel M6 threaded rod.
Don't forget to use teflon plumbers tape on all threaded connections, it helps greatly with leak prevention.
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