Quote:
Originally Posted by jr_tech
If the bonding material on a particular tube is a type of polyester resin (I believe that some were ... PPG 5252 or something like that), methylene chloride will do the job. Very nasty, however. 
jr |
Really nasty and dangerous. It has a high vapor pressure and will evaporate very quickly. It would have to be a very valuable tube before I'd try it.
Quote:
Originally Posted by jr_tech
YES! I think that is the reason for some frustration on this board... methods for dealing with one type of bonding material may not be effective, and perhaps even dangerous to use to remove another type.
Dow Corning 184 for example, was sometimes used on smaller special purpose tubes where high optical quality was desired... I suspect that heat alone would not be effective to remove a faceplate bonded with 184.
jr
|
I'm not sure how you'd do that either. I still have a scar from trying to remove a PMT from a light guide that we wanted to save that had been bonded with Dow 184. Have you ever seen a cataract or similar form with 184? I'd expect it to last nearly forever. Rebuilding a CRT bonded with it would be a real bear. A long term soak in trichloroethylene would swell the 184 and loosen the bond, but is also hazardous.
Dow 184 is nearly ideal for the purpose, but would break the bank for a large CRT.