Can sea sand or paving sand be used?
It is illegal to use sea sand or paving sand as an abrasive for blasting due to the fact that they contain silica. Silica is a common, naturally occurring crystal. Silica is a principal component of sand, so any blasters using sand as an abrasive will receive heavy exposure to silica. Inhaled crystalline silica (in the form of quartz or crystobalite) from occupational sources is classified by the International Agency for Research on Cancer (IARC) as a Group 1 human lung carcinogen. Particles of silica dust get trapped in the tiny sacs (alveoli) in the lungs where air exchange takes place. White blood cells called macrophages in the alveoli ingest the silica and die. The resulting inflammation attracts other macrophages to the region. The nodule forms when the immune system forms fibrous tissue to seal off the reactive area. Respirable silica dust may be invisible to the naked eye and is so light that it can remain airborne for a long time. It can thus travel long distances in the air a
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