Lime-based fillers are indispensable in the plastics industry. They improve mechanical properties, regulate viscosity and optimise rheology. They increase thermal stability and enable uniform processing in extrusion and injection moulding processes – for a uniform surface appearance. In addition, they contribute to cost optimisation without compromising quality and are compatible with a wide range of polymer types – from PE, PP and PVC to SMP and PU systems. Lime products thus enable efficient, stable and economical plastic formulations.
The lime products and fillers of the Calmit Group are specially tailored to the requirements of the plastics industry – from thermoplastics and elastomers to compounds and masterbatches.
Areas of application in plastics and polymers
Calcium carbonate plays a key role as a filler for thermoplastics, as it increases the stiffness of the materials, reduces raw material costs and enables uniform extrusion of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polystyrene (PS). Carbonates are used for elastomers and rubber to increase abrasion resistance, improve edge stability and support vulcanisation. In compounds and masterbatches, finely ground carbonates serve as a carrier material, improving dispersibility and enabling homogeneous colour mixtures. Calcium carbonate also ensures high whiteness, excellent opacity and high gloss, making it particularly attractive for applications in packaging, films and technical parts. In addition, fillers influence melt viscosity, reduce thermal conductivity and contribute to higher energy efficiency by enabling faster cycle times during processing.
Our product solutions for the plastics industry
Do you develop compounds, produce films, packaging or technical plastic parts? The optimal product selection depends on your production processes and requirements. Our sales staff will be happy to advise you on selecting the right product.
- High-quality calcium carbonate products (PCC) for PE, PP and PVC applications – with defined particle size ranges and high purity.
- Finest calcium oxides and hydroxides (fine lime and hydrated lime) for special applications, e.g. as functional additives in polymer chemistry.
- Calcium carbonate and mineral fillers with precise particle distribution – for compounds, masterbatches, rubber and engineering plastics.
- Precipitated calcium carbonate PCC – Calprec PR and Calprec PE/PN are functional fillers that improve the mechanical properties and appearance (whiteness, gloss, surface texture) of various rigid plastics, especially PVC. Compared to other standard fillers, they reduce the amount of more expensive additives such as dispersants, impact modifiers, etc.
