Borax Pentahydrate

Borax Pentahydrate

CAS Number:12179‑04‑3

Synonyms:Borax pentahydrate; Sodium borate pentahydrate; Etibor‑48; V‑Bor

Chemical Formula:Na₂B₄O₇·5H₂O

Molecular Weight:291.35 g/mol

Product Introduction

A white, odorless crystalline or granular solid. Less hygroscopic than decahydrate and higher in boron content, ideal for technical applications including flux, fertilizer, glass fiber insulation, ceramics, fire retardants, and adhesives.

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Physical & Chemical Properties

Property Value
Appearance White crystalline powder or granules
Density ~1.82 g/cm³
Melting/Sublimation ~392 °F (~200 °C) sublimes
Solubility in Water High; varies with temperature
pH of Solution ~9.18 (Etibor‑48)

Applications

  • Fluxing agent: jewelry, soldering, metal processing
  • Agriculture: boron fertilizer to correct soil deficiencies
  • Glass & ceramics: fiber insulation, glazing, fire retardants
  • Adhesives & detergents:pH buffer, starch adhesive viscosity control

Safety & Handling:

  • Low toxicity (oral LD₅₀ ~2660 mg/kg rat). Mild dust and eye/respiratory irritant. Non‑flammable. Store sealed, dry, away from acids. Use dust controls and PPE.

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