Re: Tank Cap Seal Failure

Terry you are correct in thinking that hot melt glue has polymers similar
to PP/PE, but it will not stick unless you use a glue with a close melting
point to PP/PE. In the past I tried several experiments using Paraffin and
PE melted together as a possible way to do that, but was basically
unsuccessful. You can use a heat gun to "weld" a PE seam, but it is
difficult to localize the heat. The Paraffin/PE mixture does work well for
"potting" (permanently) HV components when oil is not wanted. Another
possibility for those who want to make a oil resistant tank is to use
Acrylic or PVC, both can be glued with solvents as Dichloromethane, that
work by dissolving the plastic. But one must have a pressure release valve,
incase of internal arcing.


David Trimmell

At 07:16 AM 11/1/1999 -0700, you wrote:
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>I think hot melt glue will stick to them.  Hot melt glue is based on
>polypropylene, I "think"...
>	Terry
>At 04:03 PM 10/31/1999 -0800, you wrote:
>>Yes, Nothing Sticks to PP or PE (if someone knows of something let me
>>know!). There are two ways to seal the lid (that I know of): Mechanical
>>seal, like the valve cover gasket in your car; Two: Fusing the two pieces
>>together thermally. You can melt PE/PP. But you must be very carful in
>>controlling the temperature, MP= 85 to 110 C (PE).
>>David Trimmell