Rubber Manufacturers
Calcium carbonate and talc are two of the most widely used mineral fillers in the rubber industry. Their role extends beyond mere cost reduction — they actively influence the mechanical properties, processing behaviour and end-use performance of rubber compounds.
For tyre manufacturers and technical rubber goods producers, the choice of filler grade is a critical specification decision. Particle size distribution, surface chemistry and brightness all affect how the mineral integrates with the rubber matrix.
Why do filler grades matter?
Ground calcium carbonate (GCC) in fine and ultra-fine grades provides a reinforcing effect that improves tensile strength and hardness in natural and synthetic rubber compounds. Coated grades — treated with stearic acid — disperse more readily in non-polar rubber matrices, reducing mixing time and energy consumption.
Talc, with its platy particle morphology, contributes stiffness and barrier properties. In extruded profiles and moulded technical parts, talc-filled compounds show reduced creep and better dimensional stability over thermal cycling.
Heliopolis supplies both GCC and talc to rubber compounders across Egypt, the GCC countries and export markets in Europe and Asia. All grades are supplied with full technical data sheets covering particle size, brightness, moisture and chemical analysis.