Each of the two minerals – Hydromagnesite and Huntite (HMH) – are flame retardants on their own, the combination however results in a unique product which specific properties may be adjusted by selected mining and processing to fit a variety of applications.
UltraCarb has a unique 3-stage fire retardant mechanism. Whereas the classical endothermic flame retardant fillers act by releasing water in a single action process, UltraCarb works as following:
- Water is released at temperatures of ~220°C (thermal decomposition)
- CO2 release at temperatures of ~330°C
- At temperatures of ~560°C, UltraCarb particles accumulate at the surface of the burning polymer to form a stable cementitious char which inhibits the combustion process and thus the propagation of the fire through burning droplets.
The platy, high surface area particles of UltraCarb provide excellent properties when used as a functional filler in polymers. The products' high heat absorption protects polymers from a rapid thermal degradation and the formation of combustible products.
UltraCarb is used as a fire retardant filler in a wide range of polymers such as polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and rubber.