Industrial borax

CAS №

1303-96-4

ГОСТ

GOST 8429-77

Формула

Na2B4O7•10H2O

Сорт

Grade B

Фасовка

25 kg; 50 kg

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Description

Obtaining

Industrial borax (sodium tetraborate decahydrate) is obtained by the neutralization of boric acid with sodium carbonate.

Application

Depending on purpose industrial borax gets produced in two grades: A and B.

Borax grade, А is used in the production of non-ferrous metals, porcelain ware, for special and other purposes.

Borax grade B is used in enamels and glazes in manufacturing of technical equipment, sanitary products, in the process of wire drawing, in the welding flux, solder, and for other purposes.

Safety requirements

Borax is fire and explosion-proof. Its toxicity is caused by the main basic component — boric acid which is a substance of the 3rd level of danger for the human body.

Packing

Borax is packed in four-layer paper bags, foil liners insertered in flax-jute-kenafnye, four-layer paper or laminated with rubber-mix bags. It is аllowed to pack the product in special soft disposable containers.

Shelf life

6 months from a manufacturing date.

Physical and chemical properties

Item	Norm
Item	A	B
Appearance	White or colorless fine crystalised powder
Mass fraction of borax (Na₂B₄O₇•10H₂O), %, not less than	99.5	94.0
Mass fraction of water insoluble residue, %, not more than	0.04	0.1
Mass fraction of carbonate (CO₃^2-), %, not more than	0.1	0.2
Mass fraction of sulfate (SO₄^2-), %, not more than	0.1	0.2
*Mass fraction of heavy metals (Pb²⁺), %, not more than	0.005	0.01
*Mass fraction of arsenic (As³⁺), %, not more than	0.001	0.001

* Note: items 6 and 7 are determined by the customer’s request.

Safety requirements

Class of danger	3 (due to the main basic component)
Basic properties and hazards
Basic properties	Loose, white or colorless, crystalised product.
Explosion and fire	Fire- and explosion-proof.
The risk to humans	It’s toxicity is caused by the main basic component — boric acid which is a substance of the 3rd level of danger for the human body. Borax inhaled as dust or aerosol irritates skin and mucous membranes of the respiratory tract. When inhaled in large quantities borax can cause poisoning.
Individual protection means	Special clothing, footwear, goggles, dust mask type "petal", hands protection. Prohibited to eat, drink or smoke.