Fire-polished grinding Crystal pyrex Glass Disc

ZS-1

ZS-2

HS

Spectral characteristics
The average transmittance

180-2500nm

200-2500nm

260-3500nm

90%

85%

85%

Bubble class

0

2

2

Birefringence

1-2

1-2

1-2

Grain structure

1

2

2

Stripe

1-2

1-2

2

Uniformity

1-2

2

2

Fluorescence

1

2

2

Radiation Performance

Does not change color

Slight discoloration

Change color

Thermal  properties

Standard value 

Transformation point

1280°c

Softening point

1780°c

Annealing point

1250°c

Specific heat

670J/kg.°c

Thermal conductivity

1.4W/m.°c

Index of refraction

1.4585

Thermal processing

temperature

1750 - 2050°c

Short-term use temperature

1300°c