The 3R4400HT boards are manufacture from low biopersistent superwool bulk fibers, refractory fillers and organic and inorganic binders. These boards offer an excellent thermal and physical performance in high-temperature applications. It is a good alternative to traditionnal solutions due to is high refractoriness and excellent non-wetting characteristics with molten aluminum.  The 3R4400HT provides stability and resistance to most types of chemical attack.  Thermal and physical properties are restored after drying.  

Thin 3R4400HT boards are easily die-cut and all boards can be cut with a hacksaw blade allowing precise shapes to be made.   It can be storage in low heat conditions.    It has a very low thermal conductivity.   

The superwool low biopersistent fibres with which the 3R4400HT board is made are not classified as carcinogenic.

The 3R4400HT boards offer the highest classification temperature up to 1300°C (2370°F).  It is specially designed for application up to 1000°C (1830°F) requiring cycling resistance and high mechanical performances as in domestic boilers.