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202878

Boric acid

99.999% trace metals basis

Synonym(s):

orthoboric acid

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Pack SizeSKUAvailabilityPrice
10 g

Available to ship onApril 08, 2026fromMILWAUKEE

$50.60
50 g

Available to ship onApril 08, 2026fromMILWAUKEE

$141.00
250 g

Available to ship onApril 08, 2026fromMILWAUKEE

$488.00

About This Item

Linear Formula:
H3BO3
CAS Number:
10043-35-3
Molecular Weight:
61.83
NACRES:
NA.23
PubChem Substance ID:
24852125
UNSPSC Code:
12352300
EC Number:
233-139-2
MDL number:
MFCD00011337
eCl@ss:
38120104
Assay:
99.999% trace metals basis
Form:
crystalline powder

$50.60

Available to ship onApril 08, 2026Details

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vapor pressure

2.6 mmHg ( 20 °C)

Quality Level

200

assay

99.999% trace metals basis

form

crystalline powder

mp

160 °C (dec.) (lit.)

solubility

water: 49.2 g/L at 20 °C

density

1.49 g/cm3 at 23 °C

SMILES string

OB(O)O

InChI

1S/BH3O3/c2-1(3)4/h2-4H

InChI key

KGBXLFKZBHKPEV-UHFFFAOYSA-N

General description

Boric acid is a weak monobasic acid, it accepts OH- ions, hence is a Lewis acid. In boric acid, B is sp2 hybridized, forming a planar triangle structure.The principal oxide of boron, B2O3, is obtained as a vitreous solid by dehydration of boric acid at red heat.

Application

•Glass manufacturing: Used in the manufacture of glass fibers to enhance strength and color.
•Ceramics: employed in glazing ceramic wares for improved durability and aesthetics.
•Chemical Intermediate: Acts as a precursor for borates and other boron-based compounds.
•Nuclear Reactors: Utilized as a water coolant and neutron absorber in nuclear applications.
•Electrolytic Capacitors: Used in the production of electrolytic condensers and capacitors.

Packaging

Packaged in poly bottles

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This Item
B0252B79011.00165
Boric acid 99.999% trace metals basis

Sigma-Aldrich

202878

Boric acid

Boric acid ReagentPlus®, ≥99.5%

Sigma-Aldrich

B0252

Boric acid

Boric acid suitable for electrophoresis, ≥99.5%

Sigma-Aldrich

B7901

Boric acid

Boric acid for analysis EMSURE® ACS,ISO,Reag. Ph Eur

Supelco

1.00165

Boric acid

assay

99.999% trace metals basis

assay

≥99.5%

assay

≥99.5%

assay

99.5-100.5% (alkalimetric)

Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

300

form

crystalline powder

form

powder

form

powder

form

solid

solubility

water: 49.2 g/L at 20 °C

solubility

water: 40 mg/mL, clear, colorless

solubility

H2O: 40 mg/mL, clear, colorless

solubility

49.2 g/L

mp

160 °C (dec.) (lit.)

mp

160 °C (dec.) (lit.)

mp

160 °C (dec.) (lit.)

mp

160 °C (dec.) (lit.)

vapor pressure

2.6 mmHg ( 20 °C)

vapor pressure

2.6 mmHg ( 20 °C)

vapor pressure

2.6 mmHg ( 20 °C)

vapor pressure

2.6 mmHg ( 20 °C)

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pictograms

Health hazard
GHS08

signalword

Danger

hcodes

H360FD

Hazard Classifications

Repr. 1B

Storage Class

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

wgk

WGK 1

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type P3 (EN 143) respirator cartridges

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Certificates of Analysis (COA)

Lot/Batch Number
0000515885
0000515885
0000487546
0000487546
0000437431

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Articles

High Purity Carbon Adsorbents for Chromatography

Synthetic CMS carbons offer tailored adsorbents for specific applications.

Akie Shimotohno et al.
Plant & cell physiology, 56(4), 620-630 (2015-02-12)
Boron, an essential micronutrient, is transported in roots of Arabidopsis thaliana mainly by two different types of transporters, BORs and NIPs (nodulin26-like intrinsic proteins). Both are plasma membrane localized, but have distinct transport properties and patterns of cell type-specific accumulation
Hye Ryeo Lee et al.
Journal of chromatography. A, 1346, 117-122 (2014-05-09)
In liquid phase microextraction, high enrichment factors can be obtained using an acceptor phase of small volume. By hanging an acceptor drop at the separation capillary tip, single drop microextraction (SDME) can be in-line coupled with capillary electrophoresis (CE). The
Albert Serrà et al.
ACS nano, 8(5), 4630-4639 (2014-05-03)
Electrodeposition from microemulsions using ionic liquids is revealed as a green method for synthesizing magnetic alloyed nanoparticles, avoiding the use of aggressive reducing agents. Microemulsions containing droplets of aqueous solution (electrolytic solution containing Pt(IV) and Co(II) ions) in an ionic
View All Related Papers

Global Trade Item Number

SKUGTIN
202878-250G04061838765321
202878-10G04061838765314
202878-50G04061838765338

Questions

1–2 of 2 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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