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ROBAX ® is a transparent glass-ceramic with a thermal endurance far exceeding that of normal tempered glass.

ROBAX ® is designed to function at temperatures ranging from minus 4000 F to plus 14000 F.  Due to its thermal endurance and stability as a glass-ceramic, ROBAX ® is used in products ranging from stove tops to missile nose cones and astronomical telescope mirror substrates. It is particularly suited for use as thermal windows in room heating devices, such as stoves and fireplace inserts. ROBAX ® allows you to enjoy the fire view with assurance that the window offers a superior margin of safety for your home and family.



  • Designed for temperatures ranging from minus 4000 F to plus 14000 F.
  • Can be produced in a wide variety of shapes and sizes to accommodate many applications.
  • In most applications, ROBAX ® is an excellent replacement for any of the following glasses: Pyrex®, Borofloat®, Tempax®, Vycor®, Pyroceram®, and Neoceram®.
  • Manufactured by SCHOTT, with glass-ceramic know-how & approximately 30 years of market expertise.
  • Excellent view of dancing flames and a cozy feeling of warmth guaranteed by high transparency.
  • Best security against the “dangers“ of fire due to an unbeatable temperature resistance, high stability and durability.


  • Vision Panels for Wood and Gas Fireplace Doors
  • Oven Door Windows
  • Cover Panels for Heating Radiators
  • Cover Panels for Reflectors and High Performance Floodlights
  • Cover Panels in IR Drying Appliances
  • Cover Panels for Beamers
  • UV Blocking Shields
  • Cover Panels for Kebab Grill Radiators
  • Barbecue Grill Windows
  • Furnace Observation Windows
  • Spark and Flame Guard Panels



The following guidelines for glass and glass ceramic apply to the installation and handling of ROBAX®:

  • When determining the sizes of the frame and panel, the differences in thermal expansion behavior of ROBAX® (nearly zero) and the respective frame materials, but also possible manufacturing tolerances, need to be taken into account.
  • If the design requires the panel to be pressed against the frame, one must make sure that the panel is never subjected to high pressure at any time as a result of clamps or mounting.
  • Non-distorting frames should be used. If slight distortion cannot be avoided, a suitable permanently elastic gasket must be used to prevent the distortion of the frame from being transferred over to the glass ceramic panel.
  • Direct contact between glass and metal (or other hard construction elements) should be avoided. We recommend permanently elastic heat-resistant materials, such as mineral fiber materials, as an insert between the glass ceramic and the metal.

Frameless Fitting

  • When ROBAX® is used in frameless doors, there is a danger of mechanical stress (bending stress, impact, shock, etc.). In such cases, please pay close attention to the following basic points. Of course, the general information applies, as well:
  • The weight of the panel should be distributed across rails of a sufficient size. Stress on specific points, e.g. caused by the weight of the panel “resting” on the screws/bushings, should be avoided. The pressure forces transferred to the glass by the rails must be absorbed by a suitable material that is both stable in temperature and flexible (e.g. glassfiber cord between hinge/handle and panel).
  • Contact pressure on the panel that could cause it to bend under force must be avoided. This can be accomplished by restricting the torque or using a mechanical stop that limits the screw penetration, for example.
  • Closing the door should not cause any additional pressure (or leverage) on the side of the panel that is mounted with a hinge.
  • The hinges should not jam during closing, as the corresponding resistance forces could be transferred to the glass when the door is opened or closed.
  • Bending forces are exerted on the corners of the glass panel during locking. These depend, among other things, on the position of the holes drilled for the locking mechanism and the pressure that the user needs to exert to lock the door. There is no cause for concern regarding strength, as long as the pressure force that is applied to the panel does not exceed 40 N. No design limitations are necessary with respect to the size and position of the holes drilled, as long as the standard recommendations for our product information are followed.
  • The diameter of the holes that are drilled must be selected in such a way that expansion of the metallic components (bushings, mounting rails, etc.) as a result of temperature is still able to take place (play). In addition, the edges of the holes must be of sufficient quality and have a chamfered edge on both sides. The edges of the panel should be ground.


ROBAX® transparent glass ceramic for fireplaces and stoves can be cleaned using conventional glass cleaners.  Glass ceramic should only be cleaned once it has cooled down.

Never use abrasive sponges, scouring agents or abrasive cleaning agents, as damages can occur to the surface.


Contact Us

Coral Industries, Inc.

1-800-772-7737, ext. 1376