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Orthoboric acid
[CAS# 10043-35-3]

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Complete supplier list of Orthoboric acid
Identification
Classification API >> Synthetic anti-infective drugs >> Disinfectant antiseptic
Name Orthoboric acid
Synonyms Boracic acid; Boron trihydroxide; Boric acid; Entimaden; Flea Prufe; NSC 81726
Molecular Structure CAS # 10043-35-3 (11113-50-1), Orthoboric acid, Boracic acid, Boron trihydroxide, Boric acid, Entimaden, Flea Prufe, NSC 81726
Molecular Formula H3BO3
Molecular Weight 61.83
CAS Registry Number 10043-35-3 (11113-50-1)
EC Number 233-139-2
SMILES B(O)(O)O
Properties
Solubility 49.5 g/L (water, 20 ºC), soluble (ethanol, acetone) (Expl.)
Density 1.4±0.1 g/cm3, Calc.*, 1.435 g/mL (Expl.)
Melting point 169 ºC (decomp.) (Expl.)
Index of Refraction 1.385, Calc.*
* Calculated using Advanced Chemistry Development (ACD/Labs) Software.
Safety Data
Hazard Symbols symbol   GHS08 Danger    Details
Hazard Statements H360FD    Details
Precautionary Statements P203-P280-P318-P405-P501    Details
Hazard Classification
up    Details
HazardClassCategory CodeHazard Statement
Reproductive toxicityRepr.1BH360
Reproductive toxicityRepr.1BH360FD
Reproductive toxicityRepr.1AH360
Specific target organ toxicity - repeated exposureSTOT RE1H372
Skin irritationSkin Irrit.2H315
Eye irritationEye Irrit.2H319
Specific target organ toxicity - single exposureSTOT SE1H370
Specific target organ toxicity - repeated exposureSTOT RE2H373
Acute toxicityAcute Tox.4H332
Specific target organ toxicity - single exposureSTOT SE3H335
Specific target organ toxicity - single exposureSTOT SE3H336
Reproductive toxicityRepr.1BH360FD
SDS Available
up Discovory and Applicatios
Orthoboric acid, commonly known as boric acid (H3BO3), is a weak Lewis acid of boron that has been widely studied and utilized across various industries. It occurs naturally in certain minerals, volcanic waters, and hot springs. It can be synthesized through the reaction of borax (sodium tetraborate) with mineral acids, such as hydrochloric or sulfuric acid, resulting in the precipitation of orthoboric acid in crystalline form. The compound is highly soluble in water and alcohol, with its solubility increasing at higher temperatures.

Orthoboric acid is extensively used in the glass and ceramics industry, where it serves as a flux to lower the melting point of silica-based materials and improve the mechanical strength and thermal resistance of glass and ceramic products. In the production of borosilicate glass, it enhances durability and resistance to thermal expansion, making it a key component in laboratory glassware, cookware, and optical materials.

In agriculture, orthoboric acid is an important source of boron, an essential micronutrient for plant growth. It is incorporated into fertilizers to correct boron deficiencies in soil, which can otherwise lead to poor root development and reduced crop yields. However, excessive application can be toxic to plants, requiring careful dosage control.

Orthoboric acid has been widely employed in the pharmaceutical and medical fields. Due to its mild antiseptic and antifungal properties, it has been used in ophthalmic solutions, skin treatments, and as a preservative in some pharmaceutical formulations. It has also been utilized in medical research to study its potential effects in various biological systems.

In industrial applications, orthoboric acid functions as a lubricant and flame retardant. It is used in metalworking fluids, where it helps reduce friction and wear. In polymer manufacturing, it contributes to flame resistance in plastics, textiles, and other materials by inhibiting combustion and reducing flammability.

Another significant application of orthoboric acid is in pest control. It has been widely used as an insecticide against cockroaches, ants, and termites. Its mechanism of action involves disrupting the digestive system and metabolism of insects, leading to dehydration and death. Since it is relatively low in toxicity to humans and pets when used appropriately, it has been incorporated into household and commercial pest control products.

In nuclear energy applications, orthoboric acid is employed as a neutron absorber in pressurized water reactors (PWRs). The boron content in the acid helps regulate the fission reaction by controlling neutron flux, contributing to reactor safety and efficiency.

Orthoboric acid has been extensively studied for its physicochemical properties and interactions with various substances. It is known to form esters with alcohols and reacts with polyhydroxy compounds to create stable complexes. These chemical properties have been leveraged in laboratory research and chemical synthesis.

Due to its wide range of applications and well-documented properties, orthoboric acid remains an important chemical in numerous fields. Its availability, stability, and functional versatility make it a valuable material in both scientific and industrial contexts.

References

2025. Ratio type nanoprobe with boric acid as recognition unit for imaging intracellular H2O2 with SERS. Talanta, 281.
DOI: 10.1016/j.talanta.2024.127224

2025. Modulating room temperature phosphorescence of acrylamide by stepwise rigidification for its detection in potato crisps. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 328.
DOI: 10.1016/j.saa.2024.125372
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