Science, Tech, Math › Science What Is Borax and How Is It Used? Share Flipboard Email Print ThoughtCo / Hilary Allison Science Chemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Biochemistry Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated January 31, 2020 Borax is a natural mineral with a chemical formula Na2B4O7 • 10H2O. Borax also is known as sodium borate, sodium tetraborate, or disodium tetraborate. It is one of the most important boron compounds. The International Union of Pure and Applied Chemistry (IUPAC) name for borax is sodium tetraborate decahydrate. Did You Know? The common usage of the term "borax" refers to a group of related compounds, distinguished by their water content:Anhydrous borax or sodium tetraborate (Na2B4O7)Borax pentahydrate (Na2B4O7·5H2O)Borax decahydrate (Na2B4O7·10H2O) Borax Versus Boric Acid Borax and boric acid are two related boron compounds. The natural mineral, mined from the ground or collected from evaporated deposits, is called borax. When borax is processed, the purified chemical that results is boric acid (H3BO3). Borax is a salt of boric acid. While there are some differences between the compounds, either version of the chemical will work for pest control or slime. Where to Get Borax Borax is found in laundry booster, hand soaps, and in some kinds of toothpaste. You can also find it in one of these products: 20 Mule Team Borax (pure borax)Powdered hand soapTooth bleaching formulas (check labels for borax or sodium tetraborate) Borax Uses Borax has many uses on its own, plus it is an ingredient in other products. Here are some uses of borax powder and pure borax in water: Insect killer, particularly in roach killing products and as moth-preventative (ten percent solution on wool)FungicideHerbicideDesiccantLaundry boosterHousehold cleanerWater softening agentFood additive as a preservative (banned in some countries) Borax is an ingredient in several other products, including: Buffer solutionsFlame retardantsTeeth bleaching productsGlass, ceramics, and potteryEnamel glazesA precursor for boric acidScience projects such as green-colored fire, slime, and borax crystalsAnalytical chemistry borax bead testFlux for welding iron and steel How Safe Is Borax? Borax in the usual form of sodium tetraborate decahydrate is not acutely toxic, which means a large amount would need to be inhaled or ingested to produce health effects. As far as pesticides go, it's one of the safest chemicals available. A 2006 evaluation of the chemical by the U.S. EPA found no signs of toxicity from exposure and no evidence of cytotoxicity in humans. Unlike many salts, skin exposure to borax does not produce skin irritation. However, this doesn't make borax categorically safe. The most common problem with exposure is that inhaling the dust can cause respiratory irritation, particularly in children. Ingesting large amounts of borax can cause nausea, vomiting, and diarrhea. The European Union (EU), Canada, and Indonesia consider borax and boric acid exposure a potential health risk, primarily because people are exposed to it from many sources in their diet and from the environment. The concern is that overexposure to a chemical generally deemed safe could increase the risk of cancer and damage fertility. While the findings are somewhat contradictory, it's advisable children and pregnant women limit their exposure to borax if possible. View Article Sources "Report of the Food Quality Protection Act (FQPA) Tolerance Reassessment Eligibility Decision (TRED) for Boric Acid/Sodium Borate Salts." Office of Prevention, Pesticides, and Toxic Substances, United States Environmental Protection Agency, 1 July 2006. Thundiyil, Josef G, Judy Stober, Nida Besbelli, and Jenny Pronczuk. "Acute pesticide poisoning: a proposed classification tool." Bulletin of the World Health Organization vol 86, no. 3, 2008, p. 205-209.