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CAS Number: 10043-35-3 
MDL number: MFCD00011337
Linear Formula: H3BO3

E 284 (Boric acid), more specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formula B(OH)3. 
E 284 (Boric acid) may also be called hydrogen borate or boracic acid. 

E 284 (Boric acid) is usually encountered as colorless crystals or a white powder, that dissolves in water, and occurs in nature as the mineral sassolite. 
E 284 (Boric acid) is a weak acid that yields various borate anions and salts, and can react with alcohols to form borate esters. 

E 284 (Boric acid), Natural acid, but commercially produced from boron.
Boric Acid is a monobasic Lewis acid with the chemical formula H3BO3.
E 284 (Boric acid) is an acid-containing four atoms of oxygen, one atom of phosphorus, and three atoms of hydrogen. 

E 284 (Boric acid) is also known as acidum boricum, hydrogen borate, boracic acid, and orthoboric acid. 
E 284 (Boric acid) is a weak acid and has antiviral, antifungal, and antiseptic properties.
E 284 (Boric acid) is soluble in water and does not have any characteristic odour. 

Under standard conditions, E 284 (Boric acid) exists either as a colourless crystal or in a white powdery form. 
E 284 (Boric acid) can be prepared by reacting borax with hydrochloric acid. 
E 284 (Boric acid) can be noted that Wilhelm Homberg was the first person to prepare boric acid from borax.

Dissolved in acid, ethanol, hot water, and slightly dissolved in cold water.
Colorless crystal powder. 
Be greasy in the surface. 

With strong hygroscopicity, it is easy to be hydrolysised to form E 284 (Boric acid). 
In high temperature, E 284 (Boric acid) can be reduced by alkali metal or magnesium to monocrystal boron. 
E 284 (Boric acid) can be completely mixed with the oxides of metal, copper, sliver, aluminum, tin, arsenic.

E 284 (Boric acid), also known as hydrogen borate, is a weak monobasic Lewis acid of boron with the chemical formula H3BO3. 
E 284 (Boric acid) is typically utilized in industrial processing and manufacturing, but is also used as an additive in pharmaceutical products, cosmetics, lotions, soaps, mouthwash, toothpaste, astringents, and eyewashes. 

E 284 (Boric acid) is known to exhibit some antibacterial activity against infections such as bacterial vaginosis and candidiasis.
E 284 (Boric acid) is an odorless white solid. 

Melting point 171°C. 
Sinks and mixes with water.
E 284 (Boric acid) is a member of boric acids. 

E 284 (Boric acid) has a role as an astringent. 
E 284 (Boric acid) is a conjugate acid of a dihydrogenborate.
E 284 (Boric acid) and borate salts exist naturally in rocks, soil, plants and water as forms of the naturally occurring element boron.

E 284 (Boric acid) and borate salt pesticides were registered for use in 1948 and were reregistered by the United States Environmental Protection Agency (U.S. EPA) in 1993.
The borate salts include sodium tetraborate, disodium octaborate and sodium metaborate.

Both sodium tetraborate and disodium octaborate occur in several hydration states. 
Sodium tetraborate decahydrate is also known as E 284 (Boric acid).
The water solubility of E 284 (Boric acid) and sodium tetraborate (all hydration states) increases at higher water temperatures.

E 284 (Boric acid) is a weak acid (pKa = 9.15), existing in aqueous solutions at or below pH 7 as undissociated boric acid. Above pH 10 the metaborate anion dominates the solution.
Sodium metaborate is much higher in solubility and alkalinity than the other borates. 

Sodium metaborate solutions range in pH from 10.5 to 12, while E 284 (Boric acid) solutions typically have a pH of about 9.
To convert doses of boron compounds to boron equivalents, multiply the dose by the compound's boron content.
For example, multiply the number of mg E 284 (Boric acid) by 0.1748 to find the equivalent dose of boron in mg.3

E 284 (Boric acid)'s physical structure is powder.
Colourless, odourless, transparent crystals or white granules or powder; slightly unctuous to the touch; occurs in nature as the mineral sassolite.

The common name for E284 is E 284 (Boric acid). 
E 284 (Boric acid) is also known as boracic acid, sassolite (when in mineral form), or borofax.
As well as occurring naturally, E 284 (Boric acid) can also be produced commercially from boron. 

E 284 (Boric acid) (Boric acid, orthoboric acid, E284) is a weak acid. Chemical formula H3VO3.
E 284 (Boric acid), also called hydrogen borate, boracic acid, and orthoboric acid is a weak, monobasic Lewis acid of boron. However, some of E 284 (Boric acid)'s behavior towards some chemical reactions suggest E 284 (Boric acid) to be tribasic acid in the Brønsted sense as well. 

E 284 (Boric acid) has the chemical formula H3BO3 (sometimes written B(OH)3), and exists in the form of colorless crystals or a white powder that dissolves in water. 
When occurring as a mineral, E 284 (Boric acid) is called sassolite.

-Caviar, shellfish, fish products, canned preserves
-Cosmetic Uses:    antimicrobial agents, buffering agents, denaturants
-E 284 (Boric acid) and borates are used as a buffer to control acidity in products. 

-E 284 (Boric acid) is also used in multi-vitamin/mineral products as a mineral source.
-Rarely used in foods, but often in farmaceuticals.

-E 284 (Boric acid) is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other boron compounds.

-The term "E 284 (Boric acid)" is also used generically for any oxoacid of boron, such as metaboric acid HBO2 and tetraboric acid H2B4O7.

-E 284 (Boric acid)has been used as the fusion agent in decomposition of silicates, the dopant of semiconductor material, the additives of heatproof glassware and paint refractory. 
-E 284 (Boric acid)has been used in production of alloy steel in metallurgical industry. 

-In addition, E 284 (Boric acid)’s used as the catalyst of organic synthesis, the additive of lubricant used in high temperature, and can be also used to environmental protection.

E 284 (Boric acid) exhibits minimal bacteriostatic and antifungal activities. 
E 284 (Boric acid) is likely to mediate antifungal actions at high concentrations over prolonged exposures.

-E 284 (Boric acid) is a weakly acidic hydrate of boric oxide with mild antiseptic, antifungal, and antiviral properties. 
The exact mechanism of action of boric acid is unknown; generally cytotoxic to all cells. 
-E 284 (Boric acid) is used in the treatment of yeast infections and cold sores.

-E 284 (Boric acid) and its sodium borate salts are active ingredients in pesticide products used as insecticides, acaricides, algaecides, herbicides, fungicides and as wood preservatives.

-Uses for individual boric acid and borate salt products vary widely. Boric acid and its sodium borate salts are active ingredients in pesticides used against insects, spiders, mites, algae, molds, fungi, and weeds.

-E 284 (Boric acid) and borate salt products are used on a variety of sites including sewage systems, food and non-food crops, outdoor residential areas, and indoor sites such as homes, hospitals, and commercial buildings.

-Commercial formulations of E 284 (Boric acid) and borate salts include liquids (solutions, emulsifiable concentrates), granules, wettable powders, dusts, pellets, tablets, rods and baits in concentrations ranging from 1% to nearly 100%.

-In addition to pesticidal uses, E 284 (Boric acid) and borate salts may be used as soil amendments in boron-deficient soils.
-E 284 (Boric acid), anhydrous sodium tetraborate and sodium tetraborate decahydrate (borax) are also used as components of plant fertilizers, household cleaners, laundry detergents and personal care products.

-Boron is present in many foods and drinking water supplies. 
Estimated human consumption of boron in the U.S. diet ranges from 0.02 mg boron/day to more than 9 mg boron/day with an estimated average intake of 1.17 mg boron/day for men and 0.96 mg boron/day for women. 
Recent evidence has suggested that boron may be an essential micronutrient.

-E 284 (Boric acid) and borates are released into the environment by human activities including the use of borate salt laundry products, coal burning, power generation, chemical manufacturing, copper smelters, rockets, mining operations and industries using boron compounds in the manufacture of glass, fiberglass, porcelain enamel, ceramic glazes, metal alloys and fire retardants.

-Boric Acid; E 284 (Boric acid) is obtained by the reaction of colemanite ore with sulfuric acid or borac and mineral acid. E 284 (Boric acid) is generally used for glass, ceramics, detergent, agriculture, flame retardant, nuclear energy, wood protection, medicine, antibacterial and cleaning purposes.

-E 284 (Boric acid) is used in the manufacture of textile fibreglass
-E 284 (Boric acid) is used in the production of the flat panel display
-E 284 (Boric acid) is used to neutralize the active hydrofluoric acid

-E 284 (Boric acid) is used by blacksmiths as welding flux
-E 284 (Boric acid) is used in electroplating
-E 284 (Boric acid) is used in the jewellery industry

-E 284 (Boric acid) is used in the manufacture of silly putty
-E 284 (Boric acid) is used as an Insecticidal
-E 284 (Boric acid) is used as an antiseptic and antibacterial

-E 284 (Boric acid) is used on carrom boards as a dry lubricant
-E 284 (Boric acid) is used as a neutron poison in some nuclear plants
-E 284 (Boric acid) is used to preserve grains like wheat and rice

-E 284 (Boric acid) as a Medicine:
E 284 (Boric acid) is widely used as an antiseptic for the treatment of minor cuts and burns. 

Furthermore, E 284 (Boric acid) is also used in medical dressings and salves. 
Very dilute solutions of E 284 (Boric acid) can be used as an eyewash. 

Owing to its antibacterial properties, E 284 (Boric acid) can also be used for the treatment of acne in humans. 
In E 284 (Boric acid)'s powdered form, E 284 (Boric acid) can also be sprinkled into socks and shoes to prevent the athlete’s foot (tinea pedis).

-In the list of the chemical additives that are used for hydraulic fracturing (also known as fracking), it is not uncommon for E 284 (Boric acid) to be present. 
E 284 (Boric acid) is also used as a cross-linking and gelling agent in combination with guar gum and is known to regulate the viscosity and rheology of the drilling fluid which is pumped at high pressure in wells. 

Furthermore, E 284 (Boric acid) is of vital importance to regulate the fluid viscosity that helps to keep the grains of the propping agents suspended for long transport distances in order to keep the cracks in the shales sufficiently open. 
E 284 (Boric acid) facilitates the extraction of gas after relieving the hydraulic pressure.

-Used Cavier, fungus control on citrus fruits
-Other Uses: Baby powder, bath powder, soap, eye cream, mouthwash, cosmetics

-E 284 (Boric acid) is a food additive approved by the European Union (EU). 
E 284 (Boric acid) is a natural acid that acts as an antimicrobial preservative, mostly for pharmaceuticals, as well as a bleaching agent. 

-E 284 (Boric acid) is used as an ant poison in Australia.
-E 284 (Boric acid) also has uses as an antiseptic and insecticide.

-Examples of food and drink products that sometimes include E 284 (Boric acid):
*dairy products

-In medicine :
Used As an independent disinfectant. 

-Also, on the basis of E 284 (Boric acid), various combined preparations are made, for example, Teymurov paste; in everyday life, E 284 (Boric acid) used to be used to fight cockroaches.

-These additives are authorised in the EU for use as preservatives sturgeon eggs (caviar) up to the maximum concentration of E 284 (Boric acid) at 4 g/kg. 

-Historically, sturgeon caviar from Russians whas stored in barrels and buried them in the ground. 
As the soil around the Caspian Sea is rich with borax, it acted as a preservative and resulted in a slight bittersweet sugaring (so less salt was required to keep their eggs).

-E 284 (Boric acid) is used in fireproofing wood and textiles, and also in electrolytic condensers. 
-E 284 (Boric acid) can be indirect additive used in food contact substances.
-E 284 (Boric acid) Powder has multipurpose household uses. 

-E 284 (Boric acid) is effective against yeasts, and to a much lesser extent, against moulds and bacteria, to preserve food products and increase the elasticity and crispiness of foods. 
-E 284 (Boric acid) is non-hazardous & harmless for human beings and can be used with bare hands. 

-E 284 (Boric acid) can also be used as a cleanser, stain-remover, disinfectant and deodoriser.
-E 284 (Boric acid) is often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds. 

-E 284 (Boric acid), also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum, is a weak, monobasic Lewis acid of boron often used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds. 

Information regarding the mechanism of action of boric acid in mediating its antibacterial or antifungal actions is limited. E 284 (Boric acid) inhibits biofilm formation and hyphal transformation of Candida albicans, which are critical virulence factors. 
In addition, arrest of fungal growth was observed with the treatment of boric acid.

The three oxygen atoms form a trigonal planar geometry around the boron. 
The B-O bond length is 136 pm and the O-H is 97 pm. 
The molecular point group is C3h.

Two crystalline forms of orthoboric acid are known: triclinic and hexagonal. 
The former is the most common; the second, which is a bit more stable thermodynamically, can be obtained with a special preparation method.

The triclinic form of boric acid consists of layers of B(OH)3 molecules held together by hydrogen bonds of length 272 pm. 
The distance between two adjacent layers is 318 pm.

E 284 (Boric acid) may be prepared by reacting borax (sodium tetraborate decahydrate) with a mineral acid, such as hydrochloric acid:

Na2B4O7·10H2O + 2 HCl → 4 B(OH)3 + 2 NaCl + 5 H2O
E 284 (Boric acid) is also formed as a by product of hydrolysis of boron trihalides and diborane:

B2H6 + 6 H2O → 2 B(OH)3 + 6 H2
BX3 + 3 H2O → B(OH)3 + 3 HX (X = Cl, Br, I)

When heated, orthoboric acid undergoes a three step dehydration. 
The reported transition temperatures vary substantially from source to source.

When heated above 140 °C, orthoboric acid yields metaboric acid (HBO2) with loss of one water molecule:

B(OH)3 → HBO2 + H2O
Heating metaboric acid above about 180 °C eliminates another water molecule forming tetraboric acid, also called pyroboric acid (H2B4O7):

4 HBO2 → H2B4O7 + H2O
Further heating (to about 530 °C) leads to boron trioxide:

H2B4O7 → 2 B2O3 + H2O

Aqueous solution
When orthoboric acid is dissolved in water, it partially dissociates to give metaboric acid:

B(OH)3 ⇌ HBO2 + H2O
The solution is mildly acidic due to ionization of the acids:

B(OH)3 + H2O ⇌ [BO(OH)2]− + H3O+
HBO2 + H2O ⇌ [BO2]− + H3O+

However, Raman spectroscopy of strongly alkaline solutions has shown the presence of [B(OH)4]− ions, leading some to conclude that the acidity is exclusively due to the abstraction of OH− from water:

B(OH)3 + HO− ⇌ B(OH)−4

B(OH)3 + H2O ⇌ B(OH)−4 +  H+ (K = 7.3×10−10; pK = 9.14)

Or, more properly,
B(OH)3 + 2 H2O ⇌ B(OH)−4 + H3O+
This reaction occurs in two steps, with the neutral complex aquatrihydroxyboron B(OH)3(OH2) as an intermediate:

B(OH)3 + H2O → B(OH)3(OH2)
B(OH)3(OH2) + H2O + HO− → [B(OH)4]− + H3O+

This reaction may be characterized as Lewis acidity of boron toward [HO]−, rather than as Brønsted acidity. 
However, some of its behaviour towards some chemical reactions suggest it to be tribasic acid in the Brønsted sense as well.

E 284 (Boric acid), mixed with borax Na2B4O7·10H2O (more properly Na2B4O5(OH)4·8H2O) in the weight ratio of 4:5, is highly soluble in water, though they are not so soluble separately.

Sulfuric acid solution:
E 284 (Boric acid) also dissolves in anhydrous sulfuric acid according to the equation

B(OH)3 + 6 H2SO4 → [B(SO4H)4]− + 2 [HSO4]− + 3 H3O+
E 284 (Boric acid) reacts with alcohols to form borate esters, B(OR)3 where R is alkyl or aryl. 
The reaction is typically driven by a dehydrating agent, such as concentrated sulfuric acid:

B(OH)3 + 3 ROH → B(OR)3 + 3 H2O

With vicinal diols:
The acidity of boric acid solutions is greatly increased in the presence of cis-vicinal diols (organic compounds containing similarly oriented hydroxyl groups in adjacent carbon atoms, (R1,R2)=C(OH)−C(OH)=(R3,R4)) such as glycerol and mannitol.

The tetrahydroxyborate anion formed in the dissolution spontaneously reacts with these diols to form relatively stable anion esters containing one or two five-member −B−O−C−C−O− rings. 
For example, the reaction with mannitol H(HCOH)6H, whose two middle hydroxyls are in cis orientation, can be written as

B(OH)3 + H2O ⇌ [B(OH)4]− + H+
[B(OH)4]− + H(HCOH)6H ⇌ [B(OH)2(H(HCOH)2(HCO−)2(HCOH)2H)]− + 2 H2O
[B(OH)2(H(HCOH)2(HCO−)2(HCOH)2H)]− + H(HCOH)6H ⇌ [B(H(HCOH)2(HCO−)2(HCOH)2H)2]− + 2 H2O
Giving the overall reaction

B(OH)3 + 2 H(HCOH)6H ⇌ [B(H(HCOH)2(HCO−)2(HCOH)2H)2]− + 3 H2O + H+

The stability of these mannitoborate ester anions shifts the equilibrium of the right and thus increases the acidity of the solution by 5 orders of magnitude compared to that of pure boric oxide, lowering the pKa from 9 to below 4 for sufficient concentration of mannitol. 
The resulting solution has been called mannitoboric acid.

The addition of mannitol to an initially neutral solution containing E 284 (Boric acid) or simple borates lowers its pH enough for E 284 (Boric acid) to be titrated by a strong base as NaOH, including with an automated a potentiometric titrator. 

This property is used in analytical chemistry to determine the borate content of aqueous solutions, for example to monitor the depletion of boric acid by neutrons in the water of the primary circuit of light-water reactor when the compound is added as a neutron poison during refueling operations.

One of the simplest methods of preparing boric acid is by reacting borax with any mineral acid (hydrochloric acid, for instance). 
The chemical equation for this reaction can be written as:

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

E 284 (Boric acid) can also be prepared from the hydrolysis of diborane and trihalides of boron (such as boron trichloride or boron trifluoride).

Under standard conditions for temperature and pressure (STP), boric acid exists as a white, crystalline solid that is fairly soluble in water. 

The solubility of H3BO3 in water is temperature-dependent. 
At a temperature of 25 °C, the solubility of boric acid in water is 57 g/L. 
However, when the water is heated to 100 °C, the solubility of this compound increases to approximately 275 g/L. 

It can also be noted that E 284 (Boric acid) is sparingly soluble in pyridine and slightly soluble in acetone. 
The conjugate base of boric acid is the borate anion. 

The acidity of solutions of E 284 (Boric acid) is known to increase with polyols containing cis-vicinal diols (like mannitol and glycerol). 

The value of pK of B(OH)3 is known to extend to five orders of magnitude (from 9 to 4), under different concentrations of mannitol. 

It can be noted that in the presence of mannitol, the solution of E 284 (Boric acid) with increased acidity can be referred to as mannitoboric acid.

Each E 284 (Boric acid) molecule features boron-oxygen single bonds. 
The boron atom occupies the central position and is linked to three hydroxide groups. 
The overall molecular geometry of boric acid is trigonal planar. 

Orthoboric acid was first prepared by Wilhelm Homberg (1652–1715) from borax, by the action of mineral acids, and was given the name sal sedativum Hombergi ("sedative salt of Homberg"). 

However E 284 (Boric acid) and borates have been used since the time of the ancient Greeks for cleaning, preserving food, and other activities.

Molecular Weight: 61.83
Physical state: solid
Color: white
Odor: odorless
Melting point/freezing point:
Melting point: > 1.000 °C 
Initial boiling point and boiling range: 300 °C

Flammability (solid, gas): The product is not flammable. 
Upper/lower flammability or explosive limits: No data available
Flash point: Not applicable
Autoignition temperature: No data available
Decomposition temperature: No data available
pH: 5,1 at 1,8 g/l at 25 °C

Viscosity, kinematic: No data available
Viscosity, dynamic: No data available
Water solubility: 49,2 g/l at 20 °C 
Partition coefficient: n-octanol/water
log Pow: -1,09 at 22 °C 
Vapor pressure: < 0,1 hPa at 25 °C

Density: 1,49 g/cm3 at 23 °C
Relative density: 1,49 at 23 °C 
Particle characteristics: No data available
Explosive properties: No data available
Oxidizing properties: none
Other safety information:
Bulk density: ca.400 - 600 kg/m3
Dissociation constant: 8,94 at 20 °C

Molecular Weight: 61.84    
Hydrogen Bond Donor Count: 3    
Hydrogen Bond Acceptor Count: 3    
Rotatable Bond Count: 0    
Exact Mass: 62.0175241    
Monoisotopic Mass: 62.0175241    
Topological Polar Surface Area: 60.7 Ų    

Heavy Atom Count: 4    
Formal Charge: 0    
Complexity: 8    
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: 1    
Compound Is Canonicalized: Yes
Appearance: white powder (est)

Assay: 98.00 to 100.00
Food Chemicals Codex Listed:    No
Specific Gravity: 1.43500 @ 25.00 °C.
Flash Point: 32.00 °F. TCC ( 0.00 °C. ) 
logP (o/w): -0.610 (est)
Soluble in: water, 2.117e+005 mg/L @ 25 °C 

-Description of first-aid measures:
*General advice:
Show this material safety data sheet to the doctor in attendance.

*If inhaled:
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.

*In case of eye contact:
After eye contact: 
Rinse out with plenty of water. 
Call in ophthalmologist. 
Remove contact lenses.

*If swallowed:
After swallowing: 
Immediately make victim drink water (two glasses at most). 
Consult a physician.

-Indication of any immediate medical attention and special treatment needed:
No data available

-Environmental precautions:
Do not let product enter drains

-Methods and materials for containment and cleaning up:
Cover drains.
Collect, bind, and pump off spills. 
Take up carefully. 
Dispose of properly. 

-Extinguishing media:
*Suitable extinguishing media:
Use extinguishing measures that are appropriate to local circumstances and the surrounding environment.

*Unsuitable extinguishing media:
For this substance/mixture no limitations of extinguishing agents are given.

-Further information:
Prevent fire extinguishing water from contaminating surface water or the ground water system.

-Exposure controls:
--Personal protective equipment:
*Eye/face protection:
Use Safety glasses.

*Skin protection:
Full contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min

Splash contact:
Material: Nitrile rubber
Minimum layer thickness: 0,11 mm
Break through time: 480 min

*Body Protection:
protective clothing

-Control of environmental exposure:
Do not let product enter drains.

-Precautions for safe handling:
*Hygiene measures:
Immediately change contaminated clothing. 
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.
Recommended storage temperature see product label.

*Storage class:
Storage class (TRGS 510): 6.1D: 

No data available

-Chemical stability:
The product is chemically stable under standard ambient conditions (room temperature) .

-Conditions to avoid:
no information available

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