Industrial Mineral Applications

The ceramics and porcelain sector — encompassing floor and wall tile, sanitary ware, technical ceramics and domestic porcelain — is one of the most technically demanding markets for industrial mineral supply. Consistent mineralogy is not a preference in ceramics production; it is a production requirement. A shift in K₂O content between batches affects vitrification temperature, fired shrinkage and glaze fit. A rise in Fe₂O₃ introduces colour contamination that cannot be corrected in the kiln.

In porcelain tile body formulation, potash feldspar functions as the primary flux — reducing vitrification temperature and developing the glassy phase that gives vitrified tile its mechanical strength and water impermeability. Silica is used in body formulations to control thermal expansion, adjust fired shrinkage and contribute to dimensional stability in large-format tile production.

• ◆K₂O consistency — directly affects firing temperature and product uniformity
• ◆Fe₂O₃ content — affects fired whiteness and colour response in whiteware and porcelain
• ◆Particle size distribution — affects packing density, dispersion and surface finish
• ◆Batch-to-batch consistency — affects production scheduling and firing programme stability

In polymer and rubber processing, mineral fillers serve a range of functional roles that go well beyond cost reduction — they modify stiffness, influence thermal behaviour, improve surface finish, control density and in some cases enhance resistance to UV degradation or chemical attack. The selection of mineral grade has a measurable effect on compound properties and processing behaviour.

In polypropylene compounding, talc is the most widely used reinforcing mineral — typically at loadings of 10–40% by weight to increase stiffness (flexural modulus), reduce thermal expansion and improve dimensional stability at elevated temperatures. In rubber compounding, mineral fillers modify hardness and processing behaviour, while barytes is used as a weighting agent where compound density matters.

• ◆MicroTalc® — NIL Asbestos (raw material tested quarterly); LOI <6.0%
• ◆Platelet morphology — greater stiffness contribution than granular fillers
• ◆Microsil® — functional filler in rubber, polyurethane and thermosetting polymers
• ◆Microblanc® — weighting agent for density loading in plastics and rubber

The pharmaceutical manufacturing sector operates under the strictest mineral purity and documentation requirements of any industry served by Elixir Minerals. Talc is used in pharmaceutical tablet formulation as a lubricant (reducing die wall friction during compression), a glidant (improving powder flow in the hopper and feed system) and a diluent (contributing to tablet mass and compressibility). At each of these functional roles, the mineral must meet pharmacopoeial (compendial) standards.

NIL Asbestos certification is non-negotiable in pharmaceutical talc. Asbestos fibres are a designated carcinogen, and their confirmed absence from any talc used in an ingested product is a regulatory and ethical imperative — not a commercial add-on.

• ◆NIL Asbestos — talc raw material tested quarterly by an independent laboratory
• ◆Heavy metals — screened quarterly; arsenic, cadmium and mercury below the laboratory quantitation limit (approx. 25 mg/kg)
• ◆Irradiated in accordance with EN ISO 11137-1 (4.0–20.0 kGy), with a certificate of irradiation per batch
• ◆Documentation on request: TDS, SDS, CoA, asbestos and heavy metals test certificates
• ◆Particle size quality-controlled by wet sieve analysis (d50 12.1μm)

The construction products sector — encompassing tile adhesives, grouts, renders, external insulation systems, joint compounds, dry-mix mortars, sealants and specialist coatings — is a large and technically varied market for industrial mineral fillers. Mineral selection in construction products is typically driven by four criteria: particle size and gradation (affects workability, open time and dimensional stability); chemical inertness; purity; and cost-in-use.

In polymer-modified tile adhesive, silica finely milled and classified powder contributes to open time, provides the inert mineral body that carries adhesive load, and affects dimensional stability during curing. In sealant and mastic systems, lamellar fillers such as pyrophyllite contribute workability, reduce sagging and improve film integrity.

• ◆Full particle size range: finely milled and classified powders through to 6–25mm screened aggregates
• ◆Feldspar-6 VSI-processed: cuboid particle shape, low mica content, improved packing
• ◆Supersilk® Pyrophyllite — lamellar structure for sealants, mastics and grouts
• ◆Mica — joint compounds, plasters, renders and construction plasters