Boron-Nitride-Coating Grade C
• high temperature release agent
• for bending glass
• for high-grade steel and ceramic forrms
• application up to 700°C (1292°F)
• shows good high temperature lubrcating qualities
• contains "white graphite"


Boron-Nitride-Coating Grade C is a solvent-free high temperature release and lubricating agent on water base. It serves for the coating of forms from metal and ceramics, which are used for bending glass. Boron-Nitride-Coating Grade C can be used for all bending processes and bending temperatures up to a maximum temperature of 700°C. The viscosity of the chosen glass should be in the range of 8 - 10 dPa·s. For viscosities < 8 dPa·s there is a tendency of the glass to stick to the boron nitride coating. Preferred temperature ranges are given in a diagram. With the use of Boron-Nitride-Coating Grade C no traces will occur on the glass if the bending radius is not too extreme and the bending temperature not too high. Practical experiences showed that a coating can be used for up to 200-300 bending processes.


• The surface to be coated should be clean and grease-free, perhaps wash off with acetone.
• Boron-Nitride-Coating Grade C in the as received consistency can be diluted with up to 20% distilled water if necessary.
• Application is possible by brushing using a very fine brush or by spraying.
• Subsequently drying process in a drying cabinet is required for approx. 30 minutes with 150°C (301°F).
• For the activation of the refractory binder the coated form without glass should be heated up to 700°C (1292°F), then cool down to room temperature.
• Coating may be polished and smoothed with hand or with fine steel wool. Boron-Nitride-Coating Grade C is now ready for use, the coated form with the glass can be heated up to the bending temperature.
• Damages of the coating can be recovered by recoating by brush with Boron-Nitride-Coating Grade C.

Storage-Container Size

Boron-Nitride-Coating Grade C must be protected against frost. A storage temperature of >5°C (>41°F) is recommended. The containers should be kept closed. Boron-Nitride-Coating Grade C is available in 0.5kg-containers and 1kg-containers.

Technical Data



Ceramic Constituent

Boron nitride

Solid Content (boron nitride)



1.15 g/cm³

Temperature (max. Application)

700°C (1292°F) (at air)


© 2023 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst

These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.