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Crystalline Materials

The company is a developer and manufacturer of advanced materials such as gem materials, quartz glass materials, silicon and diamond, and can mechanically machine raw materials to any workpiece shape.


Crystal material selection

Introduction to crystalline materials


Ruby, also known as red corundum, has the following main physical properties: refractive index: 1.762 to 1.770, bifurcation rate of 0.008 to 0.010; density: 4.00 g/cm3.


Sapphire with the molecular formula Al2O3 is an excellent multifunctional material. It is resistant to high temperatures, has good thermal conductivity, is hard, infrared-transparent and chemically stable.

Quartz glass

Quartz glass has an extremely low coefficient of thermal expansion, high temperature resistance, excellent chemical stability, and excellent electrical insulation.

Barium fluoride

Barium fluoride crystals are an excellent high density optical material with excellent scintillation properties and a good buffer layer to connect semiconductors with different lattice constants.

Calcium fluoride

Calcium fluoride is an inorganic compound with the chemical formula CaF2 and is a colourless crystal or white powder.


Silicon, an important semiconductor material, has the chemical symbol Si and is used in the electronics industry for its high purity and excellent electrical and mechanical properties.

Zinc Sulphide (ZnS)

Zinc Sulphide (ZnS) is available in two materials, a white multispectral material and a yellow primary material, which is a chemically inert material with high purity, insoluble in water, moderate density and easy processing.

Zinc selenide (ZnSe)

Zinc selenide (ZnSe) is a chemically inert material with high purity, high environmental resistance and easy processing.

Crystalline Materials

Glass materials in general




Quartz glass
zinc selenide


Fused Silica

Example of machining of crystal parts

Case study

Optical lens elements manufactured from quartz glass, sapphire, barium fluoride, etc.

Case study

Spray nozzles and waterjet nozzles made from rubies and diamonds

Case study

Ruby measuring heads and measuring needles for CMMs

Case study

Ruby/sapphire plunger rods for various pump bodies

SPP Industry Ltd.

In the 1990s, SPP Industry Ltd was one of the first manufacturers to establish CNC machining in China. The company has now established five major machine parks in China, with significant achievements in the areas of 5-axis machining, precision grinding & honing, gear machining, large parts machining, custom tungsten carbide and new material development respectively.

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