Firebox coating 750 ml black

Firebox coating black 750 ml – heat-resistant coating for fireclay & vermiculite

The firebox coating black 750 ml is a specially developed coating for ceramic firebox linings in fireplace and stove systems. It is suitable for fireclay, vermiculite, and Thermax and provides a uniform, dark surface in the combustion chamber.

In addition to visual improvement, the surface is additionally strengthened. This allows the coating to positively support the durability of the firebox lining.

The most important at a glance

✔ Colored firebox coating for firebox linings
✔ Suitable for fireclay, vermiculite, and Thermax
✔ Heat resistant up to approx. 1100 °C
✔ Hardens the surface and can support the lifespan of the lining
✔ Economical: approx. 3.0 – 3.5 m² per 750 ml
✔ Color: black (visually also possible in dark gray)
✔ Application with brush or short-pile roller
✔ Delivered freshly filled at the factory

Frequently asked questions about firebox coating

What is the firebox coating used for?

The coating is used for the visual and functional treatment of firebox interior surfaces, especially for:

• Fireboxes of fireplaces and stoves
• Fireclay linings
• Vermiculite boards
• Thermax firebox systems

It serves to visually unify and harden the surface.

What color is the coating?

The firebox coating is available in black. Depending on the substrate structure and material, the color may turn into a dark gray after drying. This is due to the material and substrate and does not represent a product defect.

What is the consumption?

One container with 750 ml is sufficient for approx. 3.0 to 3.5 m² of surface, depending on:

• Absorbency of the substrate
• Application thickness
• Application technique

On which substrates can the coating be used?

Suitable for:

✔ vermiculite
✔ fired fireclay
✔ Thermax

❌ Not suitable for unburned refractory concrete or untreated formwork surfaces.

Why is unburned refractory concrete not suitable?

In unfired refractory concrete, residues of form oil or release agents may be present in the material. These prevent even penetration of the coating and can lead to adhesion problems or flaking. This is not a product defect but material-related.

How is the firebox coating applied?

Before use, the bottle must be shaken thoroughly so that all components mix completely.

The substrate must be:

• clean
• dry
• firm
• free of loose soot and ash residues

be.

Application is done with:

• short-fiber glaze roller or
• Brush

Drying takes place at room temperature over several hours.

Important application instructions and safety

❗ Soot deposits in old systems
In already used fireplaces, soot residues often cannot be completely removed. This can cause visible stains or unevenness after painting. This is material-related and not a reason for complaint.

❗ Occupational safety
During application, gloves and safety goggles must be worn, as the dispersion can irritate skin and eyes.

❗ Not suitable for incorrect substrates
Use on unsuitable materials (e.g., unfired refractory concrete or surfaces contaminated with release agents) can lead to adhesion problems and is outside the product liability.

Properties of the firebox coating

✔ Heat resistant up to approx. 1100 °C
✔ Improves the visual uniformity of the firebox
✔ Supports surface hardening of the lining
✔ Good adhesion on suitable ceramic substrates
✔ Even black coating (also visually possible in dark gray)
✔ Easy application with brush or roller

Technical data

Delivery and Quality

After your order, the firebox coating is freshly filled at the factory. This ensures consistent product quality and optimal application properties.

Conclusion

The firebox coating black 750 ml is the ideal solution for a visually clean and technically stable firebox design. It combines high temperature resistance with easy application and is especially suitable for chamotte, vermiculite, and Thermax linings in fireplaces and stove systems.