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Sodium Borate/Tetraborate

Executive standard: Q/YTY005-2011
CAS NO. 1330-43-4
Chemical name: Sodium tetraborate
Chines alias: 硼酸钠 无水硼砂

Product parameters

Executive standard: Q/YTY005-2011

Chines alias: 硼酸钠 无水硼砂

Chemical name: Sodium tetraborate

CAS RN: 1330-43-4

1. Physical and chemical properties:

1.1 Molecular formula: Na2B4O7

1.2 Molecular weight: 201.22

1.3 Structure formula:


1.4 Melting point: 742.5℃(for orthorhombic crystal A); 664℃(for orthorhombic crystal B)

1.5 Density: 2.28 (for orthorhombic crystal A); 2.75(for orthorhombic crystal B)

1.6 Properties: Its hygroscopicity is extremely strong. Dissolved in water, but slowly dissolved in methanol to form a concentration of 13-16solution.

2. Technical indexes:

Item Index
1st grade 2nd grade
Sodium Borate content, % ≥98.0 ≥96.0
Diboron trioxide, % 66-68 66-68

3. Application: Sodium Borate has been mainly used in the manufacturing high quality glass, optical glass, glaze of pottery and porcelain, glaze of enamel, detergent, bleaching agent, cleaning agents, flame retardant, rust inhibitor and caking agent. It could be also used as the carrier of the lubricant used in metal wiredrawing, the stabilizer of refractory material and skeleton former, the coated fluxing agent in metallurgy, the retarder of cement and concrete, the buffer of pH value in water system and emulsifier of paraffin.

4. Safety instructions: Toxic by ingestion, inhalation, eye and skin contact. Eye and skin contact can cause inflammation. Mouse, oral: LD50=1060mg/kg; rat, oral: LD50=1200mg/kg. Rubber gloves, respirator and eye protection must be used during operations in case of skin contact, eyes contact.

5. Packing: Woven bag lined with plastic bag, net weight 25kg /bag.

6. Storage: Store at cool, dry and ventilate. The shelf life is 12 months after manufacturer date. It is still available if retest result is qualified after expire date Sodium borate is a stable crystal under normal condition. If it is moistened it will react with water and release microcalorimetry.When keep in humidity condition or temperature dramatic changed environment , it may caking. Cautions in storage should keep away from the dramatic change environment, and ensure intact packing.

7. Transportation: Avoid water, exposure and violent collision .Do not transport with strong oxidizers.


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