Firebrake® 500 is a dehydrated zinc borate with multifunctional fire retardant applications in a variety of polymers. Since it contains no water of hydration, it is stable up to 600°C. It can therefore be used in polymer systems requiring very high processing temperatures. It can be fed to extruders, calendars, or injection moulding equipment in the same way as other solid polymer additives. Request a sample.
Applications & Benefits
An anhydrous form of Firebrake® ZB, especially designed for applications where no water evolution is permitted while still offering the performances associated with the optimum combination of zinc and boron in Firebrake® ZB.
Firebrake® 500 fire retardant is a dehydrated zinc borate with multifunctional applications in a variety of polymers. Since it contains no water of hydration, it is stable up to 600 °C. It can therefore be used in polymer systems requiring very high processing temperatures. It can be fed to extruders, calenders, or injection molding equipment in the same way as other solid polymer additives.
Firebrake® 500 can be used as a flame retardant and smoke suppressant in a variety of polymers including polyetherketone, polysulfone, fluoropolymer, polyester and nylon. The very significant beneficial effect of Firebrake® 500 on rate of heat release is of special interest where this factor is important, as in aircraft applications.
Chemical and Physical Properties
Boric Oxide, B2O3 56.20%
Zinc Oxide, ZnO 43.80%
Characteristics (typical values)
Refractive Index 1.58
Median Particle Size: 10 microns (Laser Diffraction)
Weight Loss (TGA) 1.5% max. to 400 °C
Stability Thermally stable to >600 °C. Can gradually absorb surface moisture–store in sealed container.
Specific Gravity 2.6
Firebrake® 500 should be stored in a sealed container because of its tendency to gradually pick up surface moisture in high humidity environments. This surface moisture is easily removed by heating at about 200 °C. The product is chemically stable and shows little tendency to cake.
Senior Development SpecialistFred Ascherl
Fred has worked for Rio Tinto Borates for over 37 years. He currently holds a position as a Senior Development Specialist.