Glass Discs

Already for 60 years our company is giving our customers competitive advantage by providing state of the art customer-specific micro-optical solutions, glass discs is one of our strengths. Our process flexibility allow us to make orders from small to large quantities for any specific customer request.

Depending on selected glass, discs are available in up to 400 mm diameters and a variety pattern specification depending on the requirements. We have supplied glass discs to different industries including medical equipment, factory automation, radars, encoders, military and defense, etc. Please find more information about different glass options below.

Manufacturing Capabilities

NG1 Black Glass Encoder Discs

NG1 Black glass is unique glass which perfectly fits for applications where reflective reading heads are used. Glass itself absorbs light pretty well and doesn’t require any additional coating on the back

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 145 mm
Thickness	0,5-4 mm
Tolerance	±0,05 mm (thickness)
Coefficient of thermal expansion	6,6 -7,2 x 10^-6/K
Flatness	Up to 1 um/25mm

Quartz Glass Encoder Discs

Clear fused quartz glass is a unique material with an unrivalled combination of purity, high temperature resistance, thermal shock resistance, high electrical insulation, optical transparency and chemical inertness.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 145 mm
Thickness	0,5-4 mm
Tolerance	±0,05 mm (thickness)
Coefficient of thermal expansion	0,52 x 10^-6/K
Flatness	Up to 1 um/25mm

Robax Glass Encoder Discs

Discs from Robax glass have a thermal expansion coefficient of almost zero and a great price ratio comparing to other low thermal expansion glasses.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 400 mm
Thickness	3-4 mm
Tolerance	±0,2 mm (thickness)
Coefficient of thermal expansion	0±0,5 x 10^-6/K
Flatness	Up to 1 um/25mm

BK7 Glass Encoder Discs

BK7 is a high quality optical glass that is usually used when the extra advantages provided by fused silica are not required. BK7 performs well in all chemical tests, so no additional or special handling is needed, which in turn reduces the costs of manufacturing. It is a relatively hard material with extremely low bubble and inclusion content.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 145 mm
Thickness	0,5-4 mm
Tolerance	±0,2 mm (thickness)
Coefficient of thermal expansion	7,1 x 10^-6/K
Flatness	Up to 1 um/25mm

Borofloat Glass Encoder Discs

Borofloat glass has outstanding thermal resistance, exceptionally high transparency and high chemical durability, as well as excellent mechanical strength.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 400 mm
Thickness	0,7 - 11 mm
Tolerance	Up to ±0,05 mm (thickness)
Coefficient of thermal expansion	3,25 x 10^-6/K
Flatness	Up to 1 um/25mm

D263 Encoder Discs

D263 thin glass is a clear borosilicate glass. Discs produced using D263 are exceptionally high in chemical resistance.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 250 mm
Thickness	0.3 - 1.1 mm
Tolerance	Up to ±0,05 mm (thickness)
Coefficient of thermal expansion	7,2 x 10^-6/K
Flatness	Up to 1 um/25mm

Soda Lime Encoder Discs

Soda Lime glass is readily available, with a wide range of applications. Due to the high thermal expansion coefficient, discs manufactured using Soda Lime have a low resistance to sudden changes in temperature..

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 600 mm
Thickness	0,3-20 mm
Tolerance	Up to ±0,05 mm (thickness)
Coefficient of thermal expansion	8,3 x 10^-6/K
Flatness	Up to 1 um/25mm

Ceramic Encoder Discs

Ceramic has good thermal conductivity, stable insulation, thermal shock resistance, wear resistance, Anti-acid and Anti-alkali.

Parameter	Value
Inner Diameter	From 2 mm
Outer Diameter	Up to 145 mm
Thickness	0,1 - 5 mm
Tolerance	Up to ±0,05 mm (thickness)
Coefficient of thermal expansion	8,5 x 10^-6/K
Flatness	Up to 1 um/25mm

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