Borax, sodium borate, sodium tetraborate, disodium tetraborate, 1 kg

SKU: CHEMI1018231

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Shipping weight, NOT item weight: 1.20 kg
Household products:

Borax is used in various household laundry and cleaning products, including the "20 Mule Team Borax" laundry booster, "Boraxo" powdered hand soap, and some tooth bleaching formulas.

pH buffer:

Borate ions (commonly supplied as boric acid) are used in biochemical and chemical laboratories to make buffers, e.g. for polyacrylamide gel electrophoresis of DNA and RNA, such as TBE buffer (borate buffered tris-hydroxymethylaminomethonium) or the newer SB buffer or BBS buffer (borate buffered saline) in coating procedures. Borate buffers (usually at pH 8) are also used as preferential equilibration solution in dimethyl pimelimidate (DMP) based crosslinking reactions.

Co-complexing agent:

Borax as a source of borate has been used to take advantage of the co-complexing ability of borate with other agents in water to form complex ions with various substances. Borate and a suitable polymer bed are used to chromatograph non-glycosylated hemoglobin differentially from glycosylated hemoglobin (chiefly HbA1c), which is an indicator of long-term hyperglycemia in diabetes mellitus.

Water-softening agent:

Borax alone does not have a high affinity for the hardness cations, although it has been used for water-softening. Its chemical equation for water-softening is given below:

Ca2+ (aq) + Na2B4O7 (aq) → Ca B4O7 (s)↓ + 2 Na+ (aq)
Mg2+ (aq) + Na2B4O7 (aq) → Mg B4O7 (s)↓ + 2 Na+ (aq)

The sodium ions introduced do not make water ‘hard’. This method is suitable for removing both temporary and permanent types of hardness.


A mixture of borax and ammonium chloride is used as a flux when welding iron and steel. It lowers the melting point of the unwanted iron oxide (scale), allowing it to run off. Borax is also used mixed with water as a flux when soldering jewelry metals such as gold or silver, where it allows the molten solder to wet the metal and flow evenly into the joint. Borax is also a good flux for "pre-tinning" tungsten with zinc — making the tungsten soft-solderable. Borax is often used as a flux for forge welding.
Small-scale gold mining
Traction engine hauling borax, Death Valley, 1904

Borax is replacing mercury as the preferred method for extracting gold in small-scale mining facilities. The method is called the borax method and is used in the Philippines.


Main article: Flubber (material)

A rubbery polymer sometimes called Slime, Flubber, 'gluep' or 'glurch' (or erroneously called Silly Putty, which is based on silicone polymers), can be made by cross-linking polyvinyl alcohol with borax. Making flubber from polyvinyl acetate-based glues, such as Elmer's Glue, and borax is a common elementary-science demonstration.

Food additive:

Borax, given the E number E285, is used as a food additive, but is banned in some countries, including the United States, China and Thailand. As a consequence, certain foods, such as caviar, produced for sale in the United States contain higher levels of salt to assist preservation. In addition to its use as a preservative, borax imparts a firm, rubbery texture to food. In China, borax (Chinese: 硼砂; pinyin: péng shā or Chinese: 月石; pinyin: yuè shí) has been found in foods including wheat and rice noodles named; lamian, shahe fen, kway teow, and chee cheong fun. In Indonesia, it is a common, but forbidden, additive to such foods as noodles, bakso (meatballs), and steamed rice. The country's Directorate of Consumer Protection warns of the risk of liver cancer with high consumption over a period of five to ten years. Borax was one of the chemicals used in 19th century industrialised food production that was investigated by Dr. Harvey W. Wiley with his famous 'Poison Squad' as part of the US Department of Agriculture. This led up to the 1906 Pure Food and Drug Act, a landmark event in the early history of food regulation in the United States.


Anti-fungal foot soak
Treatment for thrush in horses' hoofs
Is found in some commercial vitamin supplements


Ingredient in enamel glazes[35]
Component of glass, pottery, and ceramics
Used as an additive in ceramic slips and glazes to improve fit on wet, greenware, and bisque[citation needed]
Fire retardant
Anti-fungal compound for cellulose insulation
Moth proofing 10% solution for wool
Pulverized for the prevention of stubborn pests (e.g. German cockroaches) in closets, pipe and cable inlets, wall panelling gaps, and inaccessible locations where ordinary pesticides are undesirable
Precursor for sodium perborate monohydrate that is used in detergents, as well as for boric acid and other borates[citation needed]
Tackifier ingredient in casein, starch and dextrin based adhesives
Precursor for boric acid, a tackifier ingredient in polyvinyl acetate, polyvinyl alcohol based adhesives
To make indelible ink for dip pens by dissolving shellac into heated borax
Curing agent for snake skins[citation needed]
Curing agent for salmon eggs, for use in sport fishing for salmon[citation needed]
Swimming pool buffering agent to control pH
Neutron absorber, used in nuclear reactors and spent fuel pools to control reactivity and to shut down a nuclear chain reaction
As a micronutrient fertilizer to correct boron-deficient soils.
Preservative in taxidermy
To color fires with a green tint
Was traditionally used to coat dry-cured meats such as hams to improve the appearance and discourage flies.
For stopping car radiator and engine block leaks[citation needed]
Used by blacksmiths in forge welding
Used as a woodworm treatment (diluted in water)[citation needed]
Used as an insecticide in some ant baits. It kills ants slowly, allowing the ants time to bring the poison back to the colony, killing the queen and eventually the entire colony.
Deodorizer for carpets, sprinkle on and leave for a while and vacuum it up.

Source: Wikipedia.

Borax, sodium borate, sodium tetraborate, disodium tetraborate, 1 kg

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