Description

Potassium Pentaborate Octahydrate*Sigma Grade is a high-purity inorganic salt of boron and potassium, supplied under the stringent Sigma brand quality standards. This compound is valued for its consistent and reliable performance as a source of both potassium and borate ions in advanced research and specialized industrial processes. It is essential for professionals in analytical chemistry, materials science, and the development of specialty glass and ceramics who require precise chemical composition and traceable quality.

Application

• Analytical Chemistry & Research: Used as a certified reference material and a high-purity reagent in quantitative analysis, spectroscopy, and method development.
• Specialty Glass & Ceramics Manufacturing: Acts as a fluxing agent and a source of boron to modify thermal properties, enhance durability, and lower melting points in specialty glass formulations.
• Flame Retardant Synergist: Employed in the formulation of fire-resistant polymers, textiles, and coatings, where it works synergistically with other compounds to suppress combustion.
• Agricultural Micronutrient Formulations: Serves as a source of soluble boron for specialized fertilizer blends and hydroponic solutions, addressing boron deficiency in crops.
• Laboratory Reagent: Functions as a buffering agent and a component in specific chemical syntheses and biochemical processes requiring controlled borate concentrations.
• Metallurgy & Metal Treatment: Used in metal refining processes and as an additive in welding fluxes and metal surface treatment solutions.

Basic Information

Product Name	Potassium Pentaborate Octahydrate*Sigma Grade
CAS No.	11128-29-3
Molecular Formula	K2O·5B2O3·8H2O or KB5O8·8H2O
Molecular Weight	~ 413.15 g/mol (anhydrous basis)
Synonyms	Potassium Pentaborate Octahydrate; Dipotassium Pentaborate Octahydrate; Potassium Borate (K2O·5B2O3), Octahydrate; Boron Potassium Oxide Hydrate; Potassium Polyborate; CAS 11128-29-3
EINECS	Contact for details

Quality Control

Our Sigma Grade Potassium Pentaborate Octahydrate is produced and tested to meet exacting standards for research and industrial use. Each batch is supported by a comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles. Our quality system ensures traceability and compliance with relevant industry protocols, providing the reliability required for critical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect purity and handling properties.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (as KB5O8·8H2O)	≥ 98.0 %
pH (5% solution)	8.0 - 9.5
Loss on Drying	≤ 2.0 %
Insoluble Matter	≤ 0.05 %
Chloride (Cl)	≤ 0.005 %
Sulfate (SO4)	≤ 0.01 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.