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Gypsum

Gypsum (CaSO4 ⋅ H2O) as a glass batch material is one of the important minor constituents and a major source of sulfate in the batch. The function of the sulfate in the batch is to provide SO2 gas as a fining agent by decomposition at the proper time in the melt and to provide O2 as an oxidizing agent.

LABORATORY REPORT
PRODUCT: Gypsum - Shoals, IN
DATE: January 2014
CHEMICAL ANALYSIS SCREEN ANALYSIS
US Sieve Series
SiO2 0.80% + 4 mesh
TiO2 + 8 mesh
AI2O3 0.24% + 12 mesh 0.00
Fe2O3 0.12% + 16 mesh 0.00%
CaO 32.77% + 20 mesh 2.10%
MgO 1.29% + 30 mesh 12.50%
MnO + 40 mesh 16.60%
S= + 50 mesh
SO3 43.33% + 60 mesh 26.30%
(Base) Na2O+K2O + 100 mesh 23.60%
Carbon + 200 mesh 16.20%
Purity - 200 mesh 2.70%
    + 325 mesh
    - 325 mesh
       
TOTAL
Oxygen Corr.
Corr. TOTAL
REMARKS:
The analysis shown is a general representation of the product manufactured or shipped during the period of time indicated. It is subject to sampling and testing variations and no warranty as to accuracy, completeness, and merchantability.
LABORATORY REPORT
PRODUCT: Gypsum - Detroit, MI
DATE: January 2014
CHEMICAL ANALYSIS SCREEN ANALYSIS
US Sieve Series
SiO2 2.15% + 4 mesh
TiO2 + 8 mesh 0.00%
AI2O3 0.42% + 12 mesh 1.20%
Fe2O3 0.14% + 16 mesh 16.00%
CaO 31.98% + 20 mesh 13.70%
MgO 0.46% + 30 mesh 10.20%
MnO + 40 mesh 7.20%
S= + 50 mesh
SO3 44.14% + 60 mesh 13.10%
(Base) Na2O+K2O + 100 mesh 16.90%
Carbon + 200 mesh 10.90%
Purity - 200 mesh 10.80%
    + 325 mesh
    - 325 mesh
       
TOTAL
Oxygen Corr.
Corr. TOTAL
REMARKS:
The analysis shown is a general representation of the product manufactured or shipped during the period of time indicated. It is subject to sampling and testing variations and no warranty as to accuracy, completeness, and merchantability.
LABORATORY REPORT
PRODUCT: Gypsum - Oklahoma
DATE: January 2014
CHEMICAL ANALYSIS SCREEN ANALYSIS
US Sieve Series
SiO2 0.10% + 4 mesh
TiO2 + 8 mesh
AI2O3 0.06% + 12 mesh 0.0%
Fe2O3 0.004% + 16 mesh 0.7%
CaO 33.29% + 20 mesh 5.0%
MgO 0.18% + 30 mesh 10.9%
MnO + 40 mesh 13.1%
S= + 50 mesh
SO3 46.28% + 60 mesh 23.6%
(Base) Na2O+K2O + 100 mesh 19.4%
Carbon + 140
Purity 99.51 + 200 mesh 14.5%
    - 200 mesh 12.8%
       
TOTAL
Oxygen Corr.
Corr. TOTAL
REMARKS:
The analysis shown is a general representation of the product manufactured or shipped during the period of time indicated. It is subject to sampling and testing variations and no warranty as to accuracy, completeness, and merchantability.

The following is a typical analysis on the Gypsum.