Boric acid

CAS №

10043-35-3

ГОСТ

GOST 18704-78

Формула

H3BO3

Сорт

Grade B, import

Фасовка

25 kg

available

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Description

Application

Boric acid is meant to be used in the chemical industry, glass and ceramic’s production, medicine and other industries.

Depending on the application boric acid is available in four grades: for optical glass, A, B and C. The product branded «for optical glass» is used for optical glass and other special purposes. Grade A product is used for electrolytic capacitors, grade B product — for glass, optical glass, medicine, and other purposes, grade C product — for glass, enamels and glazes, drills, fertilizer and various other boron-containing products.

Safety requirements

Boric acid is fire and explosion-proof. It is a substance of the 3rd level of danger for the human body.

Packing

Boric acid is packed in four or five-layer paper or plastic bags, as well as in special soft disposable containers.

Shelf life

5 years from a manufacturing date.

Physical and chemical properties

Item	Norm
	For optical/glassmaking	Grade A	Grade B	Grade V
	For optical/glassmaking	Grade A	Grade B	First	Second
Appearance	Fine crystallized flowing powder of white colour
Mass fraction of boric acid (H₃BO₃), %, not less than	99,9	99,9	99,9	99,6	98,6
Mass fraction of chloride (Cl^-), %, not more than	0.001	0.0001	0.001	—	—
Mass fraction of sulfate (SO₄^2-), %, not more than	0.008	0.0005	0.008	0.2	0.5
Mass fraction of iron (Fe), %, not more than	0.0003	0.0002	0.0005	0.002	0.003
Mass fraction of heavy metals (Pb), %, not more than	0.001	0.0005	0.001	0.001	—
Mass fraction of water unsoluble residue, %, not more than	0.005	Should withstand test	0.005	0.01	0.04
Mass fraction of Calcium (Ca), %, not more than	0.005	0.001	0.005	-	-
Mass fraction of Arsenic (As), %, not more than	0.0002	0.0001	0.0002	—	—
Mass fraction of phosphate (PO₄^3-), %, not more than	0.001	0.001	0.001	—	—
Mass fraction of non-volatile residue when processed with ethanol, %, not more than	—	0.05	—	—	—
Residue on sieve 04K, not more than 0063K, not less than	10 70	— —	15 75	10 70	— —

Note

Also in boric acid marked «for optical glass» there is a standard of coloring impurities mass fraction,%, not more: Vanadium (V) — 0.0005; cobalt (Co) — 0.000003; manganese (Mn) — 0.0003; copper (Cu) — 0.00005; nickel (Ni) — 0.00001; chromium (Cr) — 0.00002.

Safety requirements

Class of danger	3
Basic properties and hazards
Basic properties	Fine crystallized flowing powder of white colour.
Explosion and fire	Fire- and explosion-proof.
The risk to humans	Vapor and spray mist of boric acid get inhaled into the human body. When dissolved in water, boric acid penetrates the damaged areas of human skin (eczema, cracks, burns), causing poisoning of the human body.
Individual protection means	When working with boric acid the people should use the respiratory protective equipment, wear goggles to protect eyes, gloves to protect hands, as well as special clothing and footwear.