Boric acid
CAS 10043-35-3
EC 233-139-2
Formula BH3O3
MW 61.83 g/mol
Inorganic Acids Pharmaceuticals & HealthcarePersonal Care & CosmeticsPrinting & PackagingTextile, Leather & PaperBuilding & ConstructionAgriculture & FeedPlastics & PolymersWater Treatment Preservation & BiocideFlame RetardancypH Regulation & BufferingAntioxidant & Stabilizer
Description
Boric acid (CAS 10043-35-3, EC 233-139-2, formula BH3O3), also known as orthoboric acid, boracic acid, and o-boric acid, is a weak inorganic acid derived from boron. It carries no assigned E-code and is classified under HS code 28100090.
In glass and fiberglass manufacturing, boric acid lowers melt viscosity and improves thermal resistance by integrating into the silicate network. In personal care formulations, it acts as a pH buffer and antimicrobial agent, disrupting microbial cell membranes at controlled concentrations. It also functions as a flame retardant in cellulosic textiles and wood treatments by promoting char formation and inhibiting combustion.
Boric acid is available in technical, agricultural, and pharmaceutical grades, with the latter conforming to Ph.Eur. and FCC standards. The substance is registered under REACH and subject to SVHC assessment due to reproductive toxicity classification. It is typically supplied in 25 kg bags or bulk quantities depending on grade and application.
In glass and fiberglass manufacturing, boric acid lowers melt viscosity and improves thermal resistance by integrating into the silicate network. In personal care formulations, it acts as a pH buffer and antimicrobial agent, disrupting microbial cell membranes at controlled concentrations. It also functions as a flame retardant in cellulosic textiles and wood treatments by promoting char formation and inhibiting combustion.
Boric acid is available in technical, agricultural, and pharmaceutical grades, with the latter conforming to Ph.Eur. and FCC standards. The substance is registered under REACH and subject to SVHC assessment due to reproductive toxicity classification. It is typically supplied in 25 kg bags or bulk quantities depending on grade and application.
Physical Properties
| Melting Point | 171 °C (decomp) |
| Boiling Point | 300 °C |
| Density | 1.435 g/cm³ @ Temp: 15 °C |
| Appearance | Boric acid is a white, amorphous powder or colorless, crystalline solid. |
| Color | ≤10(APHA) |
| Odor | Odorless |
| Form | working solution |
| Water Solubility | 49.5 g/L (20 ºC) |
| Vapor Pressure | 2.6 mm Hg ( 20 °C) |
| Refractive Index | n20/D 1.330-1.340 |
| pH | 3.6-4.4 (25℃, saturated solution in H2O) |
| Log P | -1.09 at 22℃ |
Safety & Handling (Learn More)
Danger GHS08 GHS07
H
H303H315H319H335H360H370H372H402
P
P203P260P261P264P270P271P273P280P318P319P321P405P501P264+P265P301+P317P302+P352P304+P340P308+P316P332+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 28100090 |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 2 |
Other Names
o-boric acidboracic acidorthoboric acidTBEBorofax
Related Products
Raw Materials
Need a chemical? Get a quote within 24 hours.