SCOURING POWDERS
Scouring, or abrasive, cleansers are formulated to remove dense accumulations of soils commonly located in small household hard surface areas.
Most scouring powdered cleansers mainly consist of an insoluble abrasive powder (approximately 80 percent concentration), such as screened silica (SiO2), feldspar, calcite, or limestone, with the size of the abrasive particles approximately 44 micrometers or smaller. The remainder of the product formulation often consists of calcium carbonate (CaCO3) or similar alkaline salts (e.g., sodium carbonate), with an additional 2 per- cent grease-dissolving surfactants (e.g., anionic surfactants) and, in some cases, fragrance/perfume, color/dye and approximately 1 percent anhydrous chlorine bleach (e.g., sodium dichloro-S-triazinetrione dihydrate), which also acts as a disinfectant. Scrubbing with a small amount of water causes the abrasive ingredients to physically remove stains and deposits from hard surfaces such as porcelain tubs, sinks, cookware (e.g., pots and pans), bathroom fixtures, ceramic tiles, and outdoor grills. Organic- based stain material is then absorbed into the porous powder and rinsed away with the wash water.
Baking soda (sodium bicarbonate; NaHCO3) is also a mild abrasive cleanser. This chemical absorbs food odors readily, making it appropriate for cleaning areas constantly in contact with foods, including certain types of countertops and the inside of the refrigerator.
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