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 installations. It is suitable for fireclay, vermiculite, and Thermax and ensures a uniform, dark surface in the combustion chamber.

In addition to improving the appearance, the surface is also further hardened. This allows the coating to positively support the durability of the firebox lining.

The essentials 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 help extend the service life of the lining
✔ Coverage: approx. 3.0 – 3.5 m² per 750 ml
✔ Color: black (dark gray also possible visually)
✔ Applied with a brush or short-nap roller
✔ Delivered freshly filled at the factory

Frequently asked questions about the firebox coating

What is the firebox coating used for?

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

• fireplace and stove fireboxes
• fireclay linings
• vermiculite panels
• Thermax firebox systems

It serves to visually unify the surface and harden it.

What color is the coating?

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

How much does it cover?

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

• Absorbency of the substrate
• Coating thickness
• Application technique

On which surfaces can the coating be used?

Suitable for:

✔ vermiculite
✔ fired fireclay
✔ Thermax

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

Why is uncured refractory concrete not suitable?

If uncured refractory concrete is used, residues of form release oil or mold-release agents may be present in the material. These prevent even penetration of the coating and can lead to adhesion problems or flaking. This does not constitute a product defect but is due to the material.

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
• solid
• free of loose soot and ash residue

be.

Application is carried out using:

• short-fiber glaze roller or
• Brush

Drying takes place at room temperature over several hours.

Important Application Instructions and Safety

❗ Soot Deposits on Older Installations
On previously used fireplaces, soot residues often cannot be completely removed. As a result, visible stains or unevenness may appear after painting. This is due to the material and is not grounds for complaint.

❗ Occupational Safety
Gloves and safety goggles must be worn during application, as the dispersion may 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 falls outside the scope of 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
✔ Uniform black coating (dark grey finish also possible)
✔ Easy application with brush or roller

Technical Data

Delivery and Quality

Following 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 particularly suitable for fireclay, vermiculite, and Thermax linings in fireplace and stove installations.