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The advantage of the 353ND from Epotech, is that it not only has a very high affinity to mating with metal and glass but it can be applied as an external coating. Although the 353ND has the disadvantage of not being able to withstand a 650F evacuation oven, it is possible to evacuate a crt at temperatures that the 353ND can tollerate, you just have to pump for a lot longer time. Of course this has not been proven because so far we have not had the opportunity to try a low temperature pump down in practice with 353ND sealing a 15G. Sure would be nice if someone with an oven could give this theory a try before I die.
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