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Nepheline Syenite A270

Alternate Names: Spectrum Nepheline Syenite, Nepheline Syenite Spectrum

OxideAnalysisFormula
CaO0.35%0.027
MgO0.02%0.002
K2O4.80%0.224
Na2O10.50%0.746
Al2O323.60%1.019
SiO260.20%4.412
Fe2O30.08%0.002
LOI0.42
Oxide Weight438.46
Formula Weight440.31
If this formula is not unified correctly please contact us.

Also available in 200, 400 grades (other grades are available for other purposes).

From Unimin data sheet: SPECTRUM® ceramic fluxes are produced from nepheline syenite; a naturally occurring, silica deficient sodium-potassium alumina silicate. The higher total alumina and alkali contribution available from nepheline syenite produces ceramic ware with greater impact and flexural strength and improved resistance to the stresses of thermal extremes and mechanical shock.
The lower melting eutectic and increased fluxing power of SPECTRUM® make possible body compositions which mature at temperatures as low as cone 3-5. It is the higher alkali to alumina ratio and greater chemical reactivity that accelerate the melt and promote a faster maturation. SPECTRUM will increase the rate of vitrification over a wider firing range, ensure smooth glazed surfaces even at lower temperatures and help to reduce the deformation typically encountered in fast fire cycling. When the objective is improved translucency, SPECTRUM will combine with and consume the available free crystalline silica to create highly translucent wares.

Particle size (% retained on):
200 mesh: 0.05
270 mesh: 0.67
325 mesh: 1.29

Melting point: 1868F/1020C
pH: 10.1
Bulk Density (lb/ft3): 38-55
Specific gravity: 2.61


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By Tony Hansen

XML for Import into INSIGHT

<?xml version="1.0" encoding="UTF-8"?> <material name="Nepheline Syenite A270" descrip="" searchkey="Spectrum Nepheline Syenite, Nepheline Syenite Spectrum" loi="0.00" casnumber="37244-96-5"> <oxides> <oxide symbol="CaO" name="Calcium Oxide, Calcia" status="" percent="0.350" tolerance=""/> <oxide symbol="MgO" name="Magnesium Oxide, Magnesia" status="" percent="0.020" tolerance=""/> <oxide symbol="K2O" name="Potassium Oxide" status="" percent="4.800" tolerance=""/> <oxide symbol="Na2O" name="Sodium Oxide, Soda" status="" percent="10.500" tolerance=""/> <oxide symbol="Al2O3" name="Aluminum Oxide, Alumina" status="" percent="23.600" tolerance=""/> <oxide symbol="SiO2" name="Silicon Dioxide, Silica" status="" percent="60.200" tolerance=""/> <oxide symbol="Fe2O3" name="Iron Oxide, Ferric Oxide" status="" percent="0.080" tolerance=""/> </oxides> <volatiles> <volatile symbol="LOI" name="Loss on Ignition" percent="0.420" tolerance=""/> </volatiles> </material>


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