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Boric Acid

Product Name: Boric Acid
Chemical formula: H3BO3
Other names: orthoboric acid, orthoboric acid
CAS: 10043-35-3
Molecular weight: 61.833
Einecs: 233-139-2

Structural formula: boric acid 1.jpg

product details

BRIEF DESCRIPTION

Boric acid is a crystalline compound formed by the dissolution of boron trioxide in water. It is an inorganic acid, primarily consisting of tetraboric acid (H₂B₄O₇, also known as pyroboric acid), metaboric acid (HBO₂)n, and orthoboric acid (H₃BO₃, also known as orthoboric acid). Orthoboric acid has the highest water content and is the most stable. Orthoboric acid, also simply called boric acid, appears as a white, powdery crystalline substance or triclinic scaly crystals with a glossy appearance. It has a slightly bitter taste and a slippery feel upon contact with skin. It is odorless and soluble in water, ethanol, glycerin, ethers, and essential oils. Its aqueous solution is weakly acidic. When heated to 70-100℃, orthoboric acid gradually dehydrates to metaboric acid (Chemicalbook), to pyroboric acid at 150-160℃, and to boric anhydride (B₂O₃) at 300℃. Boric acid is toxic to humans. Solubility in water: 2.77 at 0℃, 3.65 at 10℃, 4.87 at 20℃, 5.74 at 25℃, 6.77 at 30℃, 8.90 at 40℃, 11.39 at 50℃, 14.89 at 60℃, 23.54 at 80℃, and 38.00 at 100℃. The aqueous solution is weakly acidic, making it a typical Lewis acid. Its solubility in water is increased in the presence of hydrochloric acid, citric acid, or tartaric acid. Therefore, it can be purified by recrystallization.

Technical Specifications

Analysis Project	Result
Appearance	White granular crystals
Content(%)	99.94
Boron abundance (%)	19.8
Heavy metals (mg/kg)	0.1

Purpose (USE)

I. Industry

1. In the production of high-grade glasses such as optical glass, acid-resistant glass, and borosilicate glass, as well as glass fibers, boric acid can improve the heat resistance and transparency of the glass, increase its mechanical strength, and shorten the melting time. For example, in glass fiber production, it can lower the melting temperature, thus facilitating fiber drawing. Generally speaking, boric acid can reduce viscosity, control thermal expansion, prevent devitrification, improve chemical stability, and enhance resistance to mechanical and thermal shock. In glass production, boric acid is often used in combination with sodium borates (such as pentahydrate borax or anhydrous borax) to adjust the sodium-to-boron ratio in the glass.

2. In enamel and ceramic production, boron oxide is an excellent flux and network forger. It can be used to prepare glass (at low temperatures), improve the adaptability of the body to the glaze, reduce viscosity and surface tension, increase refractive index, and enhance mechanical strength, durability, and wear resistance. It is an important component of lead-free glazes. High-boron frit matures quickly, forming a smooth glaze surface rapidly, which is beneficial for coloring. When used in the production of glazes, it can reduce the thermal expansion of the glaze, lower the curing temperature of the glaze, thereby preventing cracking and glaze peeling, and improving the gloss and durability of the finished product.

Adding borate to celluloid materials alters its oxidation reaction, promoting the formation of "carbonization." This makes it flame-retardant. Boric acid, alone or in combination with borax, is effective in reducing the flammability of celluloid insulation materials, wood products, and cotton fillings in mattresses.

3. Boric acid is used as an additive and flux in the production of boron steel to give it high hardness and good rollability. It also prevents surface oxidation during metal welding, brazing, and cladding. Furthermore, it is a raw material for ferroborone alloys.

4. Boric acid can be used as a rust inhibitor, lubricant, and thermal oxidation stabilizer. It is added to lubricants, brake fluids, metalworking fluids, water treatment agents, and fuel additives.

Boric acid is a component in the manufacture of corrugated paper adhesives, and also a solvent in the manufacture of casein and dextrin adhesives. Boric acid significantly improves the wet adhesive strength through cross-linking of hydroxyl groups.

6. It can be used to remove ash from the surface of bare leather and prevent gray spots from appearing on the surface of leather after retanning.

II. Medicine

It can be used in the production of boric acid ointments, disinfectants, astringents, preservatives, etc. National pharmaceutical grade (NF) boric acid is used in cosmetics, hygiene products, and pharmaceuticals. As a cross-linking agent for emulsifying paraffin, it can also be used as an antibacterial agent.

III. Nuclear Power Plant

Boron-10 isotopes are highly efficient thermal neutron absorbers, making them indispensable in safety and control systems in nuclear power plants. Special grade (SQ) boric acid, used in the nuclear industry, increases the proportion of boron-10.

IV. Laboratory

It can be used to produce various borates, such as sodium borohydride, ammonium borate, cadmium borotungstate, and potassium borohydride. It is also commonly used as an analytical chemistry reagent for preparing buffer solutions and various culture media for haploid breeding.

STORAGE CONDITIONS

1.Store in a cool, dry, and well-ventilated place.

2.Keep away from fire and heat sources. Avoid direct sunlight.

3.Keep container sealed. Store separately from acids, metal powders, etc.

4.Open-air storage tanks require cooling measures in summer. Personal protective equipment should be worn during repackaging and handling operations.

5.Handle with care during transport to prevent damage to packaging and containers.

6.Transport should follow designated routes and should not stop in residential areas or densely populated areas .

PACKAGE

1.25KG/bag.

2. We can provide other forms of packaging according to customer needs.

CHEMICAL PROPERTIES

It is actually a hydrated form of boron oxide, appearing as a white, powdery crystalline powder or a triclinic, flaky, lustrous crystal. It has a slippery feel and is odorless. It is soluble in water, alcohol, glycerin, ethers, and essential oils.

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