Welcome to Imerys Performance Minerals

Pharmaceutical Industry

Pharmaceutical Industry Imerys minerals are valuable ingredients for medical supplies

Imerys minerals are valued ingredients for the production of medical stoppers, latex gloves and dental alginate moldings.

Medical stoppers

Imerys calcined clays and talcs provide the resealability, barrier properties and mechanical performance critical to protecting medicines from contamination and oxidation.

Imerys minerals:

  • Improve gas permeation and water absorption
  • Improve sealing properties and good resealing after puncture
  • Improve chemical resistance
  • Provide good steam and ethylene oxide sterilization resistance and UV radiation resistance
  • Are ideal reinforcing agents, improving mechanical properties of stoppers
  • Are effective processing aids, lowering compound viscosity and improving compound flow
  • Provide good thermal resistance and color retention, extending service life
  • Are chemically inert and do not react with medical substances, having no effect on the level of reducing substances, pH and UV light adsorption


We recommend:

  • Calcined clay and silane-treated calcined clay grades for multi-dose rubber stoppers where resealability is required.
  • Talc and silane-treated talc grades for improving barrier properties in pharmaceutical stopper applications, especially when low compression set, low fragmentation and high tear resistance are required.

Latex gloves

latex glove

Imerys’ ground calcium carbonate Carbital N is a liquid form of GCC particularly recommended for the production of natural latex gloves where it improves mechanical, thermal and aging properties while providing reinforcement. Carbital N is recommended for the production of surgical, medical and clean room latex gloves.  When added in the correct proportions, GCC can improve tensile strength— meaning greater resistance to tension and stretching. GCC also offers superior tear strength, so gloves are less likely to rip during use.

Dental alginate moldings

Alginates used for dental molding are visco-elastic materials with rubber-like compliance. Alginates contain high levels of diatomaceous earth (DE) filler. Imerys DE for alginates provide low compression set and low swelling enabling dentists to produce an accurate mold of the patient’s mouth.

We recommend our Celite DE range for dental alginates.


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.

Please contact us, we will be only too happy to help

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