Our Spectralux Opacifiers were introduced in 1995. Since that time, customers in sanitaryware, tile, dinnerware, and core making have enjoyed the consistency of these products.

Continental Minerals Spectralux Opacifiers are processed to our exact specifications. Custom grinds are available to meet customer's specific requirements. Spectralux has proven through the years to offer superior opacification by quality manufacturers in sanitaryware, tile, insulator, dinnerware, procelain enamel and other whiteware industries.

Our precise particle size standards and chemistry also make Spectralux the preferred opacifier for ceramic core manufacturers.

Download Spectralux Opacifiers Product Sheet PDF

Properties of Continental Mineral Processing Spectralux Opacifier (ZrSiO4)
Typical Chemical Analysis (in weight %)
*ZrO2 Zirconium Oxide 65% Min.
SiO2 Silicone Dioxide 32.5% Typ.
AI2O3 Aluminum Oxide 2.0% Max.
TiO2 Titanium Dioxide

0.35% Max.

Fe2O3 Iron Oxide 0.15% Max.
U & Th Uranium & Thorium 475 Max.
P2O5 Phosphrus Pentoxide 0.09% Typ.
*Includes 1-4% Hafnium Oxide HfO2
Typical Physical Properties
Melting Point Greater than 4000o
Coefficient of Thermal Expansion 4.2 x 10-6cm/cm/oC
Hardness 7.5 Moh's Scale
Thermal Conductivity 14.5 BTU/sq. ft./hr./oF/in.
Index of Refraction 2.0
Thermal Stability no change to 3090oF (1700oC)
Average Particle Size
1500 Spectralux 6.0 – 8.0 Microns
3500 Spectralux 1.90 – 2.10 Microns
4500 Spectralux 1.65 – 1.75 Microns
5500 Spectralux 1.40 – 1.5- Microns
6000 Spectralux 1.20 – 1.30 Microns
7000 Spectralux 0.95 – 1.05 Microns


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