| http://www.w3.org/ns/prov#value | - Apparatus such as this using a particulate abrasive material comprising 95% by weight of powdered sodium silicate and 5% by weight of common salt as the particulate abrasive material 32 has been found effective in removing a variety of soils from work surfaces, e.g. residual crude oil from the interior walls of an oil tank when used with a stand off distance (see X of FIG. 1) of less than 6 inches
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