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Ground Colemanite -45 Micron

Colemanite is the most commonly available boron
mineral. Its B2O3 content is 40±0.50%. It dissolves
slowly in water and rapidly in acidic medium.
The ore is enriched in concentrator plant to obtain
concentrated product. The concentrated product is
passed through crushing and grinding processes
respectively to obtain milled product. It is then packaged in a
packaging unit and ready for sale.

Usage and Benefits:

  • Glass and ceramics
  • Metallurgy
  • Fertilizer
  • Miscellaneous

Specific weighta : 2.50 g/cm3
Pour (bulk) densitya : 0.971 g/cm3
Molecular weight : 411.08 /mol
Heat capacity : 15.4 J/go C
Thermal conductivity : 0.526 W/mK
Specific surface area : 3.30 m2/g
Surface tension : 64.78 mN/m
(1.0% aqueous solution by weight)
Colorimetry test : 88.53 (average L value)

Product Specification

Ground Colemanite
− 45 Micron (Fine Grade)
2CaO · 3B₂O₃ · 5H₂O  ·  Hydrous Calcium Borate
CAS No.
1318-33-8
Formula
Ca₂B₆O₁₁ · 5H₂O
Chemical Specification
Component Specification Typical Value
B₂O₃40.0 ± 0.5%40.0%
CaO27.0 ± 1%26.8%
SiO₂4.00 – 6.50%5.0%
SO₄0.6% max0.3%
As (Arsenic)35 ppm max25 ppm
Fe₂O₃0.08% max0.04%
Al₂O₃0.4% max0.25%
MgO3.0% max0.2%
SrO1.5% max1.15%
Na₂O0.5% max0.15%
LOI (Loss on Ignition)25% max24.0%
Moisture1% max0.3%
Bulk Density1.0 ton/m³ max1.0 ton/m³
Particle Size Specification — Fine Grade (−45 Micron)
Sieve Size US Mesh Specification Typical Value
(+) 250 µm+ 60—0.00%
(+) 150 µm+ 1000.25% max0.10%
(−) 75 µm− 200—95.0%
(−) 45 µm− 32575.00% min84.00%
Physical Properties
PropertyValue
AppearanceGreyish-white powder
Crystal systemMonoclinic
Molecular weight411.08 g/mol
Specific gravity2.42 g/cm³
Mohs hardness4.0 – 4.5
Melting point (pure)930°C
Solubility in waterSlow in water, fast in HCl
Na₂O content0.5% max (sodium-free grade)
Packaging & Storage
ParameterDetail
Standard packaging1 ton bulk bags (FIBC)
Loose bulkAvailable on request
Storage conditionsDry, cool, steady temperature
CautionAvoid hot & humid — risk of caking
Primary Applications
Non-Sodium Fiberglass Glass & Ceramics Heat-Resistant Glass Raw Lead Glazes Ceramic Enamel Glazes Metallurgy / Flux Slag Compactor Detergent & Cosmetics
Produced at Bigadiç, Türkiye — Eti Maden İşletmeleri. Data compiled from official Eti Maden / Etimine published specifications. Verify against the latest Eti Maden datasheet before commercial use.