Permeability barrier Imerys minerals improve the barrier properties of rubber compounds
Due to the platy shape of their particles, Imerys high aspect ratio talcs reduce the gas and vapor permeability of rubber materials leading to improved barrier properties.
Talc is a highly lamellar mineral. These lamellar particles create an impermeable barrier, reducing air and liquid permeability in the rubber compound due to an increase in the mean-free path of diffusion.
Talc substantially reduces air permeability in butyl, natural and polyisoprene rubber compounds.
Platy minerals form a more effective barrier against gas diffusion
Generally speaking, the more lamellar the talc, the lower the permeability.
Imerys platy minerals are particularly suitable for use in tire inner liners, membranes and hoses. Barrier fillers also improve thermal resistance due to reduced oxygen diffusion in the finished rubber material.
We recommend our new high aspect ratio talc, Mistron® HAR, for critical applications such as tire inner liners.
We recommend our Mistron® CB talc to improve barrier properties in medical stoppers, gaskets and membrane applications.
We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.