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The cataract occurs because the clear PVA glue bonding the safety glass to the tube itself is chemically breaking down - usually due to air getting in. The result is the cataract you see.
Glad to hear you weren't hurt Doug. I've had a CRT go up in my face. If it weren't for the glasses I probably would have been blind or worse.
Reading of this makes me skiddish. I've got two 21FJP22 CRTs that both need surgery. I'd hate to have one of them go up in my face! At least the glass is stronger. I had no clue about the construction of the EGP
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Jordan
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