SODIUM TETRABORATE

Sodium tetraborate is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na2H20B4O17.

Sodium tetraborate is commonly available in powder or granular form and has many industrial and household uses, including as a pesticide, as a metal soldering flux, as a component of glass, enamel, and pottery glazes, for tanning of skins and hides, for artificial aging of wood, as a preservative against wood fungus, and as a pharmaceutic alkalizer.

Sodium tetraborate is widely used as a household cleaner and a booster for laundry detergent, and it can be harmful if swallowed, particularly for children, and can also irritate the skin.

CAS Number: 1303-96-4

EC Number: 603-411-9

Molecular Weight: 201.22

Molar Mass: 201.22 g/mol

Synonyms: 1330-43-4, Borax Anhydrous, Borax glass, Borax, fused, Boric acid (H2B4O7), sodium salt, Boron sodium oxide (B4Na2O7), Na2B4O7, Sodium Tetraborate, Sodium Tetraborate, Anhydrous, Sodiumtetraborate, Sodium borate anhydrous, Anhydrous borax, Sodium biborate, Fused borax, Sodium pyroborate, Sodium borate, anhydrous, 8191EN8ZMD, Sodium tetraborate (Na2B4O7), MFCD00081185, Boric acid (H2B4O7), disodium salt, disodium;3,7-dioxido-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane, 12267-73-1, disodium;[oxido(oxoboranyloxy)boranyl]oxy-oxoboranyloxyborinate, MFCD00163147, Komex, Borax, anhydrous, Borax, dehydrated, Sodium boron oxide, Rasorite 65, Fused sodium borate, Boric acid, disodium salt, SODIUM BORATE [MI], UNII-8191EN8ZMD, Borate-buffered saline (5X), SODIUM BORATE [WHO-DD], HSDB 5025, SODIUM TETRABORATE [HSDB], DTXSID101014358, FR 28, SODIUM TETRABORATE [VANDF], EINECS 215-540-4, MFCD07784974, AKOS015903865, AKOS030228253, DB14505, Sodium tetraborate, anhydrous, Puratronic, FT-0696539, Sodium tetraborate,Trace metals grade 99.95%, J-006292, DISODIUM BICYCLO[3.3.1]TETRABOROXANE-3,7-BIS(OLATE), 1310383-93-7

Sodium tetraborate (also referred to as sodium borate, tincal /ˈtɪŋkəl/ and tincar /ˈtɪŋkər/) is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na2H20B4O17.

Sodium tetraborate is a colorless crystalline solid, that dissolves in water to make a basic solution.

In chemical laboratories, Sodium tetraborate is used as a buffering agent.

The terms tincal and tincar refer to native Sodium tetraborate, historically mined from dry lake beds in various parts of Asia.

Sodium tetraborate is registered under the REACH Regulation and is manufactured in and / or imported to the European Economic Area, at ≥ 100 000 tonnes per annum.

Sodium tetraborate is used by consumers, in articles, by professional workers (widespread uses), in formulation or re-packing, at industrial sites and in manufacturing.

Sodium tetraborate is a powdery white substance, also known as sodium borate, sodium tetraborate, or disodium tetraborate.

Sodium tetraborate’s widely used as a household cleaner and a booster for laundry detergent.

Sodium tetraborate’s a combination of boron, sodium, and oxygen.

Sodium tetraborate is often found in dry lake beds in places like California’s Death Valley, where the water evaporated and left behind deposits of minerals.

Boric acid is made from the same chemical compound as Sodium tetraborate and even looks like Sodium tetraborate.

But while Sodium tetraborate is commonly used in cleaning, boric acid is mainly used as a pesticide.

Boric acid kills insects by targeting their stomachs and nervous systems.

Both Sodium tetraborate and boric acid in loose powder form can be harmful if swallowed, particularly for children.

They can also irritate your skin.

Applications of Sodium tetraborate:

Sodium tetraborate (Na2B4O7) can be used as a co-catalyst for the oxidation of alcohols to corresponding carbonyl compounds in greener non-chlorinated solvents in the presence of TEMPO/NaOCl.

Sodium tetraborate is also used as a structure-directing agent as well as a catalyst in the preparation of carbon aerogels using glucose as the carbon precursor.

Sodium tetraborate, 10-hydrate, Na2B4O7*10H2O (sodium tetraborate decahydrate, decahydrate, borax) is a source of boric oxide and widely used in various sectors of national economy.

Sodium tetraborate is used for production of specialized glass, fiber glass and glass fiber cloth.

Sodium tetraborate contributes to blend malting, diminishes melt viscosity, prevents from devitrification, which leads to increased end product durability, mechanic, chemical and thermal exposure resistance.

Sodium tetraborate application contributes to fiber glass hardening, chemical stability, improved thermal and sound-proof properties.

When producing enamels and glazes, Sodium tetraborate is used as a source of boric oxide.

In glazes and enamels, Sodium tetraborate is an inorganic binder.

Metallurgy – Sodium tetraborate is used as a source of boric oxide – antioxidant.

Gold mining – During processing gold ore, anhydrous Sodium tetraborate is primarily used.

Effect of anhydrous Sodium tetraborate: increased gold yield, improved quality of ingots.

Sodium tetraborate is actively used when producing cooling liquid, lubricants and brake fluids, as Sodium tetraborate forms a complex compound on metal surfaces acting as a protection barrier from corrosion.

Sodium tetraborate is used in construction as a metal construction corrosion inhibitor.

When producing green fiber, adhesives, chipboards, as antipyren antiseptic.

Sodium tetraborate is a stock component in production of sodium perborate, a basic oxygen containing beaching agent in powdered synthetic detergents, polishes, ointments.

Uses of Sodium tetraborate:

Sodium tetraborate is used as tablets or powder to kill larvae in livestock confinements and crawling insects in residences.

Sodium tetraborate is used as a fluxing agent, a buffering agent, a biocide (preservative, antiseptic, insecticide, fungicide, herbicide, algicide, nematicide), a fireproofing agent, a corrosion inhibitor, a tanning agent, and a textile bleaching agent.

Sodium tetraborate is used to manufacture glazes, enamels, borosilicate glass, fertilizers, detergents, antifreeze, pharmaceuticals, and cosmetics.

Sodium tetraborate is used in manufacture of glass, enamels, & other ceramic products.

Sodium tetraborate is used in pest control solutions because Sodium tetraborate is toxic to ants.

Because Sodium tetraborate is slow-acting, worker ants will carry the Sodium tetraborate to their nests and poison the rest of the colony.

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 solutions in dimethyl pimelimidate (DMP) based crosslinking reactions.

Sodium tetraborate 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-glycated hemoglobin differentially from glycated hemoglobin (chiefly HbA1c), which is an indicator of long-term hyperglycemia in diabetes mellitus.

Sodium tetraborate alone does not have a high affinity for hardness cations, although Sodium tetraborate has been used for water-softening.

Sodium tetraborate’s chemical equation for water-softening is given below:

Ca+2(aq) + Na2B4O7(aq) → CaB4O7(s)↓ + 2 Na+(aq)

Mg+2(aq) + Na2B4O7(aq) → MgB4O7(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 Sodium tetraborate and ammonium chloride is used as a flux when welding iron and steel.

Sodium tetraborate lowers the melting point of the unwanted iron oxide (scale), allowing Sodium tetraborate to run off.

Sodium tetraborate is also used mixed with water as a flux when soldering jewelry metals such as gold or silver, where Sodium tetraborate allows the molten solder to wet the metal and flow evenly into the joint.

Sodium tetraborate is also a good flux for “pre-tinning” tungsten with zinc, making the tungsten soft-solderable.

Sodium tetraborate is often used as a flux for forge welding.

In artisanal gold mining, Sodium tetraborate is sometimes used as part of a process known as the Sodium tetraborate method (as a flux) meant to eliminate the need for toxic mercury in the gold extraction process, although Sodium tetraborate cannot directly replace mercury.

Sodium tetraborate was reportedly used by gold miners in parts of the Philippines in the 1900s.

There is evidence that, in addition to reducing the environmental impact, this method achieves better gold recovery for suitable ores and is less expensive.

This Sodium tetraborate method is used in northern Luzon in the Philippines, but miners have been reluctant to adopt Sodium tetraborate elsewhere for reasons that are not well understood.

The method has also been promoted in Bolivia and Tanzania.

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 Sodium tetraborate.

Making flubber from polyvinyl acetate-based glues, such as Elmer’s Glue, and Sodium tetraborate is a common elementary science demonstration.

Sodium tetraborate, given the E number E285, is used as a food additive but this use is banned in some countries, such as Australia, China, Thailand and the United States.

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 Sodium tetraborate’s use as a preservative, Sodium tetraborate imparts a firm, rubbery texture to food.

In China, Sodium tetraborate (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 (Chinese: 拉面; pinyin: lāmiàn), shahe fen (Chinese: 沙河粉; pinyin: shāhéfěn), char kway teow (Chinese: 粿條; pinyin: guǒ tiáo), and chee cheong fun (Chinese: 肠粉; pinyin: chángfěn).

In Indonesia, Sodium tetraborate is a common, but forbidden, additive to such foods as noodles, bakso (meatballs), and steamed rice.

When consumed with boric acid, numerous studies have demonstrated a negative association between Sodium tetraborate and various types of cancers.

Boric acid and Sodium tetraborate are low in toxicity for acute oral exposures, at approximately the same acute toxicity as salt.

The average dose for asymptomatic ingestion cases, which accounts for 88% of all ingestions, is around 0.9 grams.

However, the range of reported asymptomatic doses is wide, from 0.01 to 88.8 g.

Biocidal Uses:

Sodium tetraborate was previously approved for use as a biocide in the EEA and/or Switzerland, and this approval has now expired, for: wood preservation.

Widespread uses by professional workers:

Sodium tetraborate is used in the following products: lubricants and greases, inks and toners, fertilisers, photo-chemicals, washing & cleaning products, biocides (e.g. disinfectants, pest control products), coating products and laboratory chemicals.

Sodium tetraborate is used in the following areas: building & construction work, agriculture, forestry and fishing, printing and recorded media reproduction and formulation of mixtures and/or re-packaging.

Sodium tetraborate is used for the manufacture of: fabricated metal products, machinery and vehicles and chemicals.

Uses at industrial sites:

Sodium tetraborate is used in the following products: pH regulators and water treatment products, welding & soldering products, laboratory chemicals and water treatment chemicals.

Sodium tetraborate has an industrial use resulting in manufacture of another substance (use of intermediates).

Sodium tetraborate is used in the following areas: building & construction work and formulation of mixtures and/or re-packaging.

Sodium tetraborate is used for the manufacture of: chemicals, mineral products (e.g. plasters, cement), machinery and vehicles, metals and fabricated metal products.

Release to the environment of Sodium tetraborate can occur from industrial use: in the production of articles, as an intermediate step in further manufacturing of another substance (use of intermediates), in processing aids at industrial sites, as processing aid, formulation of mixtures and manufacturing of Sodium tetraborate.

Industry Uses:

Adsorbents and absorbents

Agricultural chemicals (non-pesticidal)

Filler

Finishing agents

Fuels and fuel additives

Intermediates

Lubricants and lubricant additives

Lubricating agent

Not Known or Reasonably Ascertainable

Oxidizing/reducing agents

Processing aids, not otherwise listed

Viscosity adjustors

Consumer Uses:

Sodium tetraborate is used in the following products: lubricants and greases, washing & cleaning products, anti-freeze products, heat transfer fluids and adhesives and sealants.

Sodium tetraborate has an industrial use resulting in manufacture of another substance (use of intermediates).

Other release to the environment of Sodium tetraborate is likely to occur from: indoor use (e.g. machine wash liquids/detergents, automotive care products, paints and coating or adhesives, fragrances and air fresheners), outdoor use, indoor use in long-life materials with low release rate (e.g. flooring, furniture, toys, construction materials, curtains, foot-wear, leather products, paper and cardboard products, electronic equipment), outdoor use in long-life materials with low release rate (e.g. metal, wooden and plastic construction and building materials), indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters) and outdoor use in close systems with minimal release (e.g. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids).

Other Consumer Uses:

Adhesion/cohesion promoter

Adhesives and sealant chemicals

Adsorbents and absorbents

Agricultural chemicals (non-pesticidal)

Filler

Fixing agent (mordant)

Intermediates

Lubricants and lubricant additives

Oxidizing/reducing agents

Processing aids not otherwise specified

Other uses include:

Sodium tetraborate is used as ingredient in enamel glazes

Sodium tetraborate is used in component of glass, pottery, and ceramics

Sodium tetraborate is used as an additive in ceramic slips and glazes to improve fit on wet, greenware, and bisque

Sodium tetraborate is used in fire retardant

Sodium tetraborate is used in anti-fungal compound for cellulose insulation

Sodium tetraborate is used in othproofing 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

Sodium tetraborate is used in precursor for sodium perborate monohydrate that is used in detergents, as well as for boric acid and other borates

Sodium tetraborate is used in tackifier ingredient in casein, starch and dextrin-based adhesives

Sodium tetraborate is used in precursor for boric acid, a tackifier ingredient in polyvinyl acetate, polyvinyl alcohol-based adhesives

Sodium tetraborate is used in make indelible ink for dip pens by dissolving shellac into heated Sodium tetraborate

Sodium tetraborate is used in curing agent for snake skins

Curing agent for salmon eggs, for use in sport fishing for salmon

Sodium tetraborate is swimming pool buffering agent to control pH

Neutron absorber, are used in nuclear reactors and spent fuel pools to control reactivity and to shut down a nuclear chain reaction

Sodium tetraborate is used as a micronutrient fertilizer to correct boron-deficient soils

Sodium tetraborate is preservative in taxidermy

Sodium tetraborate is used in color fires with a green tint

Sodium tetraborate is used in traditionally used to coat dry-cured meats such as hams to improve the appearance and discourage flies

Sodium tetraborate is used by blacksmiths in forge welding

Sodium tetraborate is used as a flux for melting metals and alloys in casting to draw out impurities and prevent oxidation

Sodium tetraborate is used as a woodworm treatment (diluted in water)

Sodium tetraborate is used in particle physics as an additive to nuclear emulsion, to extend the latent image lifetime of charged particle tracks.

The first observation of the pion, which was awarded the 1950 Nobel Prize, used this type of emulsion.

Industrial Processes with risk of exposure:

Acid and Alkali Cleaning of Metals

Using Disinfectants or Biocides

Farming (Pesticides)

Glass Manufacturing

Chemistry of Sodium tetraborate:

From the chemical perspective, Sodium tetraborate contains the [B4O5(OH)4]2− ion.

In this structure, there are two four-coordinate boron centers and two three-coordinate boron centers.

Sodium tetraborate is a proton conductor at temperatures above 21 °C.

Conductivity is maximum along the b-axis.

Sodium tetraborate is also easily converted to boric acid and other borates, which have many applications.

Sodium tetraborate’s reaction with hydrochloric acid to form boric acid is:

Na2B4O7·10H2O + 2 HCl → 4 H3BO3 + 2 NaCl + 5 H2O

rem :Na2B4O5(OH)4·8H2O + 2 HCl → 4 B(OH)3 + 2 NaCl + 5H2O

Sodium tetraborate is sufficiently stable to find use as a primary standard for acid-base titrimetry.

Molten Sodium tetraborate dissolves many metal oxides to form glasses.

This property is important for Sodium tetraborate’s uses in metallurgy and for the Sodium tetraborate bead test of qualitative chemical analysis.

Sodium tetraborate is soluble in a variety of solvents; however, Sodium tetraborate is notably insoluble in ethanol.

The term Sodium tetraborate properly refers to the so-called “decahydrate” Na2B4O7·10H2O, but that name is not consistent with Sodium tetraborate’s structure.

Sodium tetraborate is actually octahydrate.

The anion is not tetraborate [B4O7]2− but tetrahydroxy tetraborate [B4O5(OH)4]2−, so the more correct formula should be Na2B4O5(OH)4·8H2O.

However, the term may be applied also to the related compounds.

Sodium tetraborate “pentahydrate” has the formula Na2B4O7·5H2O, which is actually a trihydrate Na2B4O5(OH)4·3H2O.

Sodium tetraborate is a colorless solid with a density is 1.880 kg/m3 that crystallizes from water solutions above 60.8 °C in the rhombohedral crystal system.

Sodium tetraborate occurs naturally as the mineral tinkhanite.

Sodium tetraborate can be obtained by heating the decahydrate above 61 °C.

Sodium tetraborate “dihydrate” has the formula Na2B4O7·2H2O, which is actually anhydrous, with the correct formula Na2B4O5(OH)4.

Sodium tetraborate can be obtained by heating the “decahydrate” or “pentahydrate” to above 116-120 °C.

Anhydrous Sodium tetraborate is sodium tetraborate proper, with formula Na2B4O7.

Sodium tetraborate can be obtained by heating any hydrate to 300 °C.

Sodium tetraborate has one amorphous (glassy) form and three crystalline forms — α, β, and γ, with melting points of 1015, 993 and 936 K respectively.

α-Na2B4O7 is the stable form.

Natural sources of Sodium tetraborate:

Sodium tetraborate occurs naturally in evaporite deposits produced by the repeated evaporation of seasonal lakes.

The most commercially important deposits are found in: Turkey; Boron, California; and Searles Lake, California.

Also, Sodium tetraborate has been found at many other locations in the Southwestern United States, the Atacama desert in Chile, newly discovered deposits in Bolivia, and in Tibet and Romania.

Sodium tetraborate can also be produced synthetically from other boron compounds.

Naturally occurring Sodium tetraborate (known by the trade name Rasorite–46 in the United States and many other countries) is refined by a process of recrystallization.

Manufacturing Methods of Sodium tetraborate:

Anhydrous Sodium tetraborate is produced from Sodium tetraborate’s hydrated forms by fusion.

Calcining is usually an intermediate step in the procsess.

Processing of sodium borate ores by crushing, heating, mechanical separation, selective crystallization, and finally flotation of Sodium tetraborate decahydrate or pentahydrate from the resultant concentrated Sodium tetraborate liquor

Sodium tetraborate containing 5 or 10 molecules of water is produced mainly from sodium-containing borate ores.

The mined ore is crushed and ground before dissolution in a hot recycled aqueous solution containing some Sodium tetraborate.

Insoluble gangue (clay particles) present in the hot slurry is separated off to produce a clear concentrated Sodium tetraborate solution.

Evaporative cooling of this solution to selected temperatures results in crystallization of the desired products, which are then separated from the residual liquor and dried.

General Manufacturing Information of Sodium tetraborate:

Industry Processing Sectors:

Agriculture, Forestry, Fishing and Hunting

All Other Chemical Product and Preparation Manufacturing

Miscellaneous Manufacturing

Non-metallic Mineral Product Manufacturing (includes clay, glass, cement, concrete, lime, gypsum, and other non-metallic mineral product manufacturing)

Not Known or Reasonably Ascertainable

Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing

Petroleum Lubricating Oil and Grease Manufacturing

Primary Metal Manufacturing

Services

Utilities

Wholesale and Retail Trade

Wood Product Manufacturing

History of Sodium tetraborate:

Sodium tetraborate was first discovered in dry lake beds in Tibet.

Native tincal from Tibet, Persia, and other parts of Asia was traded via the Silk Road to the Arabian Peninsula in the 8th century AD.

Etymology of Sodium tetraborate:

The English word borax is Latinized: the Middle English form was boras, from Old French boras, bourras.

That may have been from Medieval Latin baurach (another English spelling), borac(-/um/em), borax, along with Spanish borrax (> borraj) and Italian borrace, in the 9th century.

The words tincal and tincar were adopted into English in the 17th century from Malay tingkal and from Urdu/Persian Arabic تنکار‎ tinkār/tankār; thus the two forms in English.

These all appear to be related to the Sanskrit टांकण tānkana.

Handling and storage of Sodium tetraborate:

Advice on safe handling:

Work under hood.

Do not inhale substance/mixture.

Hygiene measures:

Immediately change contaminated clothing.

Apply preventive skin protection.

Wash hands and face after working with substance.

Conditions for safe storage, including any incompatibilities:

Storage conditions:

Tightly closed.

Keep in a well-ventilated place.

Keep locked up or in an area accessible only to qualified or authorized persons.

Storage class:

Storage class (TRGS 510): 6.1D: Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects

Stability and Reactivity of Sodium tetraborate:

Reactivity:

No data available

Chemical stability:

Sodium tetraborate is chemically stable under standard ambient conditions (room temperature).

Possibility of hazardous reactions:

Violent reactions possible with:

Strong oxidising agents

Acids

Metallic salts

First Aid Measures of Sodium tetraborate:

General advice:

Show Sodium tetraborate safety data sheet to the doctor in attendance.

After inhalation:

Fresh air.

Call in physician.

In case of skin contact:

Take off immediately all contaminated clothing.

Rinse skin with water/ shower.

Consult a physician.

After eye contact:

Rinse out with plenty of water.

Call in ophthalmologist.

Remove contact lenses.

After swallowing:

Immediately make victim drink water (two glasses at most).

Consult a physician.

Firefighting Measures of Sodium tetraborate:

Suitable extinguishing media:

Use extinguishing measures that are appropriate to local circumstances and the surrounding environment.

Unsuitable extinguishing media:

For Sodium tetraborate/mixture no limitations of extinguishing agents are given.

Special hazards arising from Sodium tetraborate or mixture:

Borane/boron oxides

Sodium oxides

Not combustible.

Ambient fire may liberate hazardous vapours.

Advice for firefighters:

Stay in danger area only with self-contained breathing apparatus.

Prevent skin contact by keeping a safe distance or by wearing suitable protective clothing.

Further information:

Suppress (knock down) gases/vapors/mists with a water spray jet.

Prevent fire extinguishing water from contaminating surface water or the ground water system.

Accidental Release Measures of Sodium tetraborate:

Personal precautions, protective equipment and emergency procedures:

Advice for non-emergency personnel:

Avoid inhalation of dusts. Avoid substance contact.

Ensure adequate ventilation.

Evacuate the danger area, observe emergency procedures, consult an expert.

Environmental precautions:

Do not let product enter drains.

Methods and materials for containment and cleaning up:

Cover drains.

Collect, bind, and pump off spills.

Observe possible material restrictions.

Take up carefully.

Dispose of properly.

Clean up affected area.

Avoid generation of dusts.

Cleanup Methods of Sodium tetraborate:

Sweep spilled substance into containers.

Carefully collect remainder, then remove to safe place. (Extra personal protection: P2 filter respirator for harmful particles).

Disposal Methods of Sodium tetraborate:

The most favorable course of action is to use an alternative chemical product with less inherent propensity for occupational exposure or environmental contamination.

Recycle any unused portion of Sodium tetraborate for Sodium tetraborate’s approved use or return Sodium tetraborate to the manufacturer or supplier.

Ultimate disposal of the chemical must consider:

Sodium tetraborate’s impact on air quality; potential migration in soil or water; effects on animal, aquatic, and plant life; and conformance with environmental and public health regulations.

Identifiers of Sodium tetraborate:

CAS Number: 1303-96-4

ChEBI: CHEBI:86222

ChEMBL: ChEMBL3833375

ChemSpider: 17339255

EC Number: 603-411-9

E number: E285 (preservatives)

KEGG: D03243

PubChem CID: 16211214

RTECS number: VZ2275000

UNII: 91MBZ8H3QO

InChI: InChI=1S/B4O7.2Na.10H2O/c5-1-7-3-9-2(6)10-4(8-1)11-3;;;;;;;;;;;;/h;;;10*1H2/q-2;2*+1;;;;;;;;;;

Key: CDMADVZSLOHIFP-UHFFFAOYSA-N

InChI=1/B4O7.2Na.10H2O/c5-1-7-3-9-2(6)10-4(8-1)11-3;;;;;;;;;;;;/h;;;10*1H2/q-2;2*+1;;;;;;;;;;

Key: CDMADVZSLOHIFP-UHFFFAOYAP

SMILES: [Na+].[Na+].O0B(O)O[B-]1(O)OB(O)O[B-]0(O)O1.O.O.O.O.O.O.O.O

Synonym(s): Borax, fused

Linear Formula: Na2B4O7

CAS Number: 1330-43-4

Molecular Weight: 201.22

EC Number: 215-540-4

MDL number: MFCD00081185

PubChem Substance ID: 24853258

CAS number: 1330-43-4

EC index number: 005-011-00-4

EC number: 215-540-4

Hill Formula: B₄Na₂O₇

Chemical formula: Na₂B₄O₇

Molar Mass: 201.22 g/mol

HS Code: 2840 11 00

Quality Level: MQ100

EC / List no.: 215-540-4

CAS no.: 1330-43-4

Mol. formula: B4Na2O7

Properties of Sodium tetraborate:

Chemical formula: Na2B4O5(OH)4·10H2O

Molar mass: 381.36 g·mol−1

Appearance: White or colorless crystalline solid

Density: 1.73 g/cm3 (decahydrate, solid)

Melting point: 743 °C (1,369 °F; 1,016 K) (anhydrous)

75 °C (decahydrate, decomposes)

Boiling point: 1,575 °C (2,867 °F; 1,848 K) (anhydrous)

Solubility in water: 31.7 g/L

Magnetic susceptibility (χ): −85.0·10−6 cm3/mol (anhydrous): p.4.135

Refractive index (nD): n1=1.447, n2=1.469, n3=1.472 (decahydrate): p.4.139

Quality Level: 200

Assay: 99%

Form: solid

mp: 741 °C (lit.)

Density: 2.367 g/mL at 25 °C (lit.)

SMILES string: [Na+].[Na+].[O-]B1Ob2ob([O-])ob(O1)o2

InChI: 1S/B4O7.2Na/c5-1-7-3-9-2(6)10-4(8-1)11-3;;/q-2;2*+1

InChI key: UQGFMSUEHSUPRD-UHFFFAOYSA-N

Density: 2.367 g/cm3 (20 °C)

Melting Point: 741 °C

pH value: 9.2 (25 g/l, H₂O, 20 °C)

Vapor pressure: 7.3 hPa (1200 °C)

Bulk density: 700 kg/m3

Solubility: 25.6 g/l

Molecular Weight: 201.2 g/mol

Hydrogen Bond Donor Count: 0

Hydrogen Bond Acceptor Count: 7

Rotatable Bond Count: 0

Exact Mass: 201.9811616 g/mol

Monoisotopic Mass: 201.9811616 g/mol

Topological Polar Surface Area: 92.3Å²

Heavy Atom Count: 13

Complexity: 121

Isotope Atom Count: 0

Defined Atom Stereocenter Count: 0

Undefined Atom Stereocenter Count: 0

Defined Bond Stereocenter Count: 0

Undefined Bond Stereocenter Count: 0

Covalently-Bonded Unit Count: 3

Compound Is Canonicalized: Yes

Specifications of Sodium tetraborate:

Assay (acidimetric): ≥ 98.0 %

Chloride (Cl): ≤ 0.001 %

Phosphate (PO₄): ≤ 0.002 %

Sulfate (SO₄): ≤ 0.005 %

Heavy metals (as Pb): ≤ 0.002 %

Ca (Calcium): ≤ 0.005 %

Fe (Iron): ≤ 0.001 %

Structure of Sodium tetraborate:

Crystal structure: Monoclinic, mS92, No. 15

Space group: C2/c

Point group: 2/m

Lattice constant:

a = 1.1885 nm, b = 1.0654 nm, c = 1.2206 nm

α = 90°, β = 106.623°°, γ = 90°

Lattice volume (V): 1.4810 nm3

Formula units (Z): 4

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