Gentle cleaning, powerful protection 20 mule team ® borax decahydrate is the refined form of natural sodium borate. composed of boric oxide (b 2 o 3), sodium oxide, and water, this mild alkaline salt has excellent buffering and fluxing properties.available in a white crystalline powder or granular form, borax decahydrate is an important multi-functional source of boric oxide, Anhydrous borax detergent soap , find complete details about anhydrous borax detergent soap,anhydrous borax,borax detergent,borax soap from borate supplier or manufacturer-zhengzhou clean chemical co., ltd. Search results for borax at sigma-aldrich. compare products: select up to 4 products. *please select more than one item to compare Oct 30, 2008 · the difference is the chemically attached water. borax can be easily converted to anhydrous borax by baking in the oven to drive off the water. you drive off the water at 250-300 degrees f to turn borax into anhydrous borax. so what is different from using 1500 degrees f to do the same thing.