Quartz Glass for Infrared Heaters

Heraeus Noblelight uses only high quality, pure quartz glass in the manufacture of its infrared heaters. Quartz glass offers a number of important and critical benefits necessary for effective, efficient process heating:
  • high transmission of infrared radiation
  • high resistance to thermal shock
  • excellent high temperature properties
  • low thermal expansion
  • chemical purity
  • chemical resistance
  • low hysteresis (lag in response time)
The graph below illustrates thermal data for fused silica (quartz glass). The red line represents change in length of a 1m long rod composed of transparent fused silica, as a function of temperature.

  • Maximum working temperature, continuous: 1100 °C
  • Maximum working temperature, short term: 1300 °C
  • Softening point: 1730 °C
thermal data for fused silica

Extra strength and durability is afforded to Heraeus twin-tube quartzglass lamps through use of the "figure 8" design; it offers strength in a manner similar to an I-beam, as the graphic below illustrates.

Figure 8 design gives strenght in the same way as a does an I-beam

Quartz glass offers excellent mechanical properties, as the chart below illustrates:

Mechanical Data of Quartz Glass (Fused Silica) at 20°C
Characteristics Fused Silica Unit
Density 2.203 g/cm3
Elasticity 7.25  •  104 N/mm2
Compressive Strength 1150 N/mm2
Tensile Strength 50 N/mm2
Bending Strength 67 N/mm2
Torsional Strength 30 N/mm2

The graph below shows the transmission of fused silica with low OH content:

transmission of fused silica

Heraeus is committed to ongoing innovation in our quest to provide effective solutions to your processing challenges.

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Heraeus Noblelight  •  Buford GA 30518 USA  •  Phone 678.835.5764  •  Email sales@noblelight.net