1. Even under thermal load, ROBAXR glass-ceramic panels show near-zero

thermal expansion. For this reason, the different thermal expansion of the

various framing materials in relation to the ROBAXR fire viewing panel must

be taken into consideration for the design of the entire fireplace.

2. Additionally, the possible manufacturing tolerances of the frame and fire

viewing panel have to be considered.

3. Contact pressure which leads to bending stress on the panel must be

eliminated. This can be achieved, for example, by limiting torque or with

a limiter which limits screw-in depth.

4. As a marginal torsion of the frame construction cannot be excluded it must

be prevented that this torsion is transmitted onto the ROBAXR fire viewing

panel by using a thermally stable, permanently elastic sealing (e.g. fiberglass

or mineral fiber fabrics).

5. If – due to constructive reasons – the pressing of the glass-ceramic panel in

the frame is inevitable, then the contact pressure must be evenly distributed

(never at single points) over the circumference of the panel.

6. The panel must not come into direct contact with metal frame parts. Also

here, it is recommended to use a thermally stable, permanently elastic seal.

7. Additionally, the instructions of the seal manufacturers must also be followed,

in particular with regard to contact pressure of materials.

8. During installation, it is essential to protect the glass-ceramic panel, especially

the edge areas from potential damage (impacts, bumps and scratches).

9. Generally, SCHOTT advises against gluing the fire viewing panel. Nevertheless,

if a high-temperature-resistant silicone is applied circumferentially on the

panel, the elastic limit of the silicone must be considered. Due to the excellent

bonding properties of glass to silicone, exceeding the elastic limit can lead to

cracked or broken fire viewing panels. Punctual gluing with high-temperature

resistant silicone is possible for sealing purposes.