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Re: Black Spots

Posted By: John Anderson
Date: Tuesday, 3 November 2009, at 3:35 p.m.

In Response To: Re: Black Spots (Don Miner)


Those spots are almost always caused by foreign material in the tube. They are common in shops where metal-grinding, wood sawing, and plastic cutting occur. Metal dust is particularly stubborn - and settles in tubes not tightly sealed up in the shop. (A sign supplier I once used had open boxes in their warehouse in the vacinity of sawing operations)

Besides the obvious of keeping tubing sealed, it's common practice for many benders when picking up a new tube to hold it vertical and let it fall a few inches down on the table a couple of times. This helps dislodge any crud that may be in there and let it fall out.

Lastly, washing clear glass tubes is a good idea. These tubes are a "raw" product, right out of the furnace. A quick rinse with water really helps. Coated tubing mfgs (EGL, Voltarc, Tecnolux, etc.) all vigorously wash the raw glass before they coat it.


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