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Heat Resistant Filler for Fireplaces, Stoves and Fireboards – Up to 1000°C
VITCAS® HRF Heat Resistant Filler
is a premium, fast-setting filler developed for repairs and jointing in high-temperature environments. Ideal for
filling small cracks around fireplaces, stoves and chimney breasts, it withstands temperatures up to
1000°C (1832°F)
.
The easy-to-apply formula is compatible with
VITCAS® HT High Temperature Fireboard
and
VITCAS® HRP Heat Resistant Plaster
. Once set, the filler can be sanded before painting to achieve a smooth, professional finish.
Key Features
Heat resistant up to 1000°C (1832°F)
Easy to apply using a standard cartridge gun
Suitable for filling small cracks and sealing joints
Fast-setting formula saves time during installation and repair
Compatible with Vitcas® HT High Temperature Fireboard
Suitable for use with Vitcas® HRP Heat Resistant Plaster
Can be sanded before painting for a smooth finish
Colour: off-white
Applications
Vitcas® HRF Heat Resistant Filler is suitable for:
Filling small cracks in chimney breasts, particularly around cassette stoves, inset stoves and fireplaces
Sealing joints between Vitcas® HT High Temperature Fireboards to create a secure, heat-resistant finish
Repairing and filling areas finished with Vitcas® HRP Heat Resistant Plaster
General high-temperature repairs requiring a durable, smooth and paintable finish
Application Instructions
Prepare the surface:
Ensure the area is clean, dry and free from dust, dirt, grease and loose material.
Prepare the cartridge:
Cut off the top of the cartridge, screw on the nozzle and trim the nozzle opening to suit the required bead size.
Apply the filler:
Using a standard cartridge gun, apply the filler evenly to the crack, joint or repair area.
Smooth the surface:
Finish immediately with a clean scraper or filling knife. The filler sets more quickly in warm conditions, so adjust
the working time accordingly.
Finish:
Once fully set, sand the surface as required before painting. Some emulsion paints may require a stabilising primer
before application.
Can VITCAS HRF Heat Resistant Filler fill cracks around a stove or fireplace?
Answer
VITCAS HRF Heat Resistant Filler is suitable for filling small cracks in chimney breasts, particularly around cassette stoves, inset stoves and fireplaces. It provides an off-white, heat-resistant repair that can be smoothed, sanded and painted once fully set. The surface must be clean, dry and free from loose material before application.
Question
Can HRF Heat Resistant Filler seal joints between heat-resistant fireboards?
Answer
Yes. The HRF filler is compatible with VITCAS HT High Temperature Fireboard and can be used to seal joints between adjoining boards. Apply it evenly with a standard cartridge gun and smooth the joint immediately using a clean scraper or filling knife. Allow the material to set fully before sanding or applying a decorative finish.
Question
Can VITCAS HRF Filler repair VITCAS HRP Heat Resistant Plaster?
Answer
The HRF Filler is suitable for repairing and filling small damaged areas finished with VITCAS HRP Heat Resistant Plaster. Remove dust, grease and any loose plaster before applying the paste to a clean, dry and stable surface. Smooth the repair immediately, then allow it to set completely before sanding and decorating.
Question
How long does HRF heat resistant filler take to dry?
Answer
The confirmed drying time is 24 hours at +20°C. Allow the filler to set fully before sanding, painting or bringing the repaired area into normal use. Drying conditions may be affected by the surrounding temperature, so avoid decorating the repair while the material remains soft or damp.
Question
Can HRF filler be sanded and painted after application?
Answer
Yes. Once fully set, the off-white filler can be sanded to produce a smoother surface before painting. Some emulsion paints may require a stabilising primer, so check the paint manufacturer’s instructions before decorating. Do not sand or paint the filler until the confirmed setting and drying process is complete.
