Salt-Bath Furnaces for Chemical Hardening of Glass

Tmax 500 °C, tailored design possible up to Tmax 1000 °C.

Process Control

Function and equipment

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Salt-bath furnace TS ../50 is designed especially for chemical tempering of glass in the laboratory. Chemical tempering is a process used to strengthen thin glass with wall thicknesses of just a few millimeters. The benefit of chemical pre-stressing is that the surface quality remains intact. Almost all glass with a high sodium content can be strengthened through ion exchange.

  • Tmax 500 °C
  • Salt-bath furnace in compact design with salt-bath and pre-heated-/cooling chamber above the salt-bath
  • Exclusive use of insulation materials without categorization according to EC Regulation No 1272/2008 (CLP). This explicitly means that alumino silicate wool, also known as “refractory ceramic fiber” (RCF), which is classified and possibly carcinogenic, is not used.
  • Bath temperature control
  • Indirect heating of the preheated chamber from the salt-bath
  • Automatic, time controlled movement from the preheating chamber into the salt-bath and back
  • Electrical door lock
  • Crucible made of hiqh-quality CrNi steel
  • Over-temperature limiter with adjustable cutout temperature as temperature limiter to protect the furnace and load
  • Defined application within the constraints of the operating instructions
  • NTLog Basic for Nabertherm controller: recording of process data with USB-flash drive
  • Controller P570 (50 programs with each 40 segments)

Additional equipment

  • Hood for connection to local exhaust system 
  • Charging basket according to customers drawing
  • Active heating for the preheated chamber
  • PLC
  • Process control and documentation via Nabertherm Control Center (NCC) for monitoring, documentation and control

Technical specifications

Model Tmax Inner dimensions crucible in mm Volume Outer dimensions2 in mm Heating power Electrical Weight
  °C1 w d h in l W D H in kW3 connection* in kg
TS 8/50 500 300 100 100 8 1600 1050 2400 2.0 3-phase 650
TS 90/50 500 650 300 450 90 1600 1050 2400 20.0 3-phase 700
1Salt-bath temperature
2External dimensions vary when furnace is equipped with additional equipment. Dimensions on request.
3Depending on furnace design connected load might be higher 

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Customer Test Center

What furnace is the right choice for this specific process? This question cannot always be answered easily. Therefore, we have set up our modern test center which is unique in respect to size and variety. A representative number of furnaces is available for tests for our customers.