Sodium Tetraborate Decahydrate Ph Grade

Catalog NumberACM1303964-2

CAS Number1303-96-4

CategoryBoron Flame Retardant

Description	It is a stable, white granule that is mildly alkaline in solution and contains no/low levels of heavy metals (as tested for lead).
Molecular Formula	Na2B4O7·10H2O
Purity	99.9% min
Solubility	Solubility in Water 0.39 lb/gal
Appearance	Granular, Powder
Content	B2O3 36.0% min. Na2O 16.0% min. SO4 400 ppm max. Cl 500 ppm max Fe 20 ppm max. Pb 20 ppm max.
Feature	Borax 10mol Ph Grade
Notes	Custom powdering as well as custom packaging is available to meet your specifications.
Packaging	50 lb/25 kg
pH	9.3 (0.1% solution 20°C)

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Case Study

Sodium Tetraborate Decahydrate Used to Prepare Flame-Retardant Rigid Polyurethane Foam

Tsuyumoto, Isao, et al. Journal of Applied Polymer Science, 2011, 122(3), 1707-1711.

Sodium tetraborate decahydrate can be used to prepare sodium polyborate (SPB), which can then be further used to prepare highly flame-retardant rigid polyurethane (RPU) foam by vacuum impregnation or pressure impregnation of SPB solution. The obtained RPU foam is a lightweight (<0.44 g/cm2) flame-retardant thermal insulator that can withstand fire for up to 19 minutes under the flame of a butane gas burner.
Flame retardant treatment of RPU foam
· Solutions of SPB containing 5.4 and 9.9 mol/kg of boron were created by dissolving boric acid (H3BO3) and sodium tetraborate decahydrate (borax, Na2B4O5(OH)4·8H2O) in water to achieve a Na/B ratio of 0.22. For the fire-retardant treatment, the 5.4 mol/kg solution was applied at room temperature after cooling, while the 9.9 mol/kg solution was utilized at 40°C to avoid precipitation. The fire-retardant SPB was incorporated into the RPU foam using wet processes involving the aqueous SPB solution.
· In the pressure impregnation method, the SPB solutions were forced into an autoclave under gauge pressures ranging from 0.2 to 1.0 MPa for a duration of 20 minutes. In the vacuum impregnation method, the vacuum desiccator containing the samples was subjected to reduced pressures of 0.8 to 0.4 MPa (equating to absolute pressures of 0.2 to 0.6 MPa) using a rotary pump, after which the SPB solution was added to the desiccator, and the samples were soaked in the solution for 10 minutes. Following the impregnation, all samples were dried in an oven at 115°C.

Borax Used in the Preparation of Highly Effective Flame-Retardant Composites Based on Calcium Alginate/Nano-Calcium Borate

Liu, Zhenhui, et al. Polymers, 2018, 10(6), 625.

A low-flammability hybrid composite material based on renewable calcium alginate/nano-calcium borate (CAB) was prepared using a vacuum drying process. The composite material exhibited excellent thermal stability and non-flammability, with a LOI higher than 60. In addition, a flame retardant mechanism was proposed, in which calcium borate can cover the surface of calcium alginate, blocking heat, oxygen and smoke particles by forming a barrier, thereby reducing the flame spread rate.
Preparation procedure of CA/CAB composites
· A mixture of 1.25 g of borax (sodium tetraborate decahydrate) and 250 mL of distilled water was prepared and stirred at 70 °C for five minutes.
· Subsequently, 10 g of sodium alginate was gradually added to the borax solution while maintaining constant stirring.
· Once a transparent gel formed, it was transferred to a glass container and submerged in a 70% (m/v) calcium chloride solution after shaping.
· The solution's pH was adjusted to 10 and maintained at 30 °C for ten hours to ensure complete cross-linking of the gel.
· Finally, the resulting material was washed with distilled water and dried at 55 °C to produce calcium alginate/nano-calcium borate (CAB) composites.

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