Colemanite

About The Product

Colemanite is a natural calcium borate mineral. Colemanite along with Tincal (Sodium Borate) is by far the most important borate mineral of commercial importance. The main constituents of Colemanite are Di Calcium Hexaborate Pentahydrate and Dolomitic Limestone or Calcite. Colemanite is used in several direct applications where the presence of sodium is undesirable. The most notable of these is in the manufacture of textile grade fiberglass, ceramic glaze formulations, tile and sanitaryware. body formulations, steel etc.

Uses and Benefits of Colemanite

Colemanite finds application in glaze formulations and tile and sanitary ware, body formulations. Depending on the characteristics of the local raw materials used, Colemanite has the following advantages:

  • Colemanite can lower the melting temperature of glaze up to 100°C.
  • Colemanite can be used in glaze formulations to replace Na-Feldspar.
  • About 15% Colemanite can replace upto 40% of Na-Feldspar in glaze composition.
  • Colemanite can be added up to 5% in tile body formulations resulting a decrease in firing temperature and good mechanical properties.
  • Colemanite added up to 2% in sanitary ware formulations results a decrease in maturing temperature up to 50°C and widens the range of vitrification.

Product Specification

Product Name Colemanite Powder
Chemical Name Di Calcium Hexaborate Pentahydrate
Chemical formula Ca2B6O11.5H2O
CAS No: 12291-65-5
molecular Weight 411.09
Appearance Homogenized Powder light to dark grey in colour
Bulk Density (Typical) 1.46-1.52 MT /m3
Particle Size 150 Mesh (BSS),85% Min
Boron (as B2O3) 35.00-40.00%
CaO 25% Min
Na2O 1.00% Max
Pb 0.003% Max
Cu 0.1% Max
As 0.01% Max
Cd 0.0025% Max
Moisture 1.00% Max
Size 150 Mesh,85% Min /0.2-3mm
Colemanite has alkaline pH of 9.5 and has a low solubility of 0.81% at 25° C in distilled water.
50 Kg HDPE Bags with Inner Liner.
Toxicity Toxic, if swallowed
Inflammability Non Flammable

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