December '20

Issue link:

Contents of this Issue


Page 61 of 168

G R A P H I C S - P R O. C O M 2 0 2 0 D E C E M B E R G R A P H I C S P R O 5 5 makes it not so cheap in relation to other media that can be recycled. Plus, you can only get sand in 80- or 90-grit size, which is very coarse compared to the 180- to 220-grit abrasives we use today. Sand works but has a definite effect in the finished piece. Since the particles are so large, you will never be able to blast a com- plete straight line with sand as an abrasive, because the particles bump into each other along any resist edge, creating small skips. This holds true for any larger area as well. These skips create a sparkly look to any sur- face blasted with sand because there are al- ways small areas of the glass that do not get abraded. One can recognize a work blasted with sand right away by this phenomenon, not to mention the ragged edges of any de- sign element. But wait, there is more. One of the com- ponents of sand is silica, which is also con- tained in glass. When you blast with sand on glass, a large amount of silica is set free in the dust created. If you do not wear ap- propriate breathing protection while using sand, you open yourself up to contracting silicosis, an accumulative process over time with eventually fatal results. As coal miners died of black lung, sandcarvers have died of white lung. In many European countries, it is against safety laws to use sand as an abra- sive. Here in the U.S., OSHA classifies sand as a hazardous material. For all the above criteria, I cannot think of one reasonable use for sand as an abrasive. Today we have the choice between two commonly used abrasives—silicone car- bide and aluminum oxide—that can be recycled and are classified by OSHA as nuisance dusts but not as hazardous ma- terials. The chart at the top of page 56 il- lustrates the common properties of both of these abrasives and may help you select one over the other. Accepts large glass up to 6 feet Simple to use Large glass viewing area Glastar Corporation Tel 800-423-5635 • E-mail: Specializing in equipment for sandblasting on glass/trophies, wood, stone or metal. THE GLASSPASSER Sandcarve Large Pieces Sit Down and Work Comfortably SIT DOWN SANDBLASTER OVER 40 YEARS Products of Quality Since 1978 Contact for more information or FREE catalog Glastar carries all parts and supplies for our sandcarving and etching equipment Brighter working area Large glass viewing area MADE IN THE

Articles in this issue

Links on this page

view archives of GRAPHICS PRO - December '20