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Formation and Occurrence
Talc confers a whole range of benefits to coatings. In interior and exterior decorative paints, they act as extenders to improve hiding power and titanium dioxide efficiency. Talc's lamellar platelets make paint easier to apply and improve cracking resistance and sagging by acting as bridges between binder agglomerates and strengthen the paint film. They also enhance matting. In anti-corrosion primers, talc is used to improve corrosion resistance and paint adhesion. Talc also brings benefits to inks, jointing compounds, putties and adhesives.
The also help in improving the weather resistance of outdoor paints by reducing oxygen or water transmission thus protecting the binder from UV radiation, thus Colour, particle size and oil absorption are the main criteria for selecting talc for paint manufacture.
As it is soft to the touch and inert, talc has been valued for centuries as a body powder. Today it also plays an important role in many cosmetic products, providing the silkiness in blushes, powder compacts and eye shadows, the transparency of foundations and the sheen of beauty creams. In pharmaceuticals, talc is an ideal excipient, used as a glidant, lubricant and diluent. Soap manufacturers also use talc to enhance skin care performance.
A major consumer of industrial minerals, the Ceramic Industry (especially Asia) uses Talc for "body" and glazing of:
Electrical Insulating (Steatite Talc)
With the plastic industry on a fast growth-track, the usage of talc is growing fast in PP, HDPE, LDPE, PVC, ABS & Thermosetting Compounds. Talc is having a huge demand as a filler.
In Polypropylene, talc is used to improve mechanical strength and scratch resistance. The
uses Talc for dashboards, interior trims, bumpers etc. Talc is also used in plastics for
where increased UV resistance is a highly desirable characteristic. It is also used as antiblocking agent in film-like bags used for fruits, vegetables etc. Many compounding factories are also using Talc.
Talc imparts the the following properties to plastic:
mproves Chemical & Heat Resistance.
Improves impact absorbing strength.
Gives dimensional stability.
Improves stiffness, hardness, tensile strength
Gives electrical insulation property.
The paper industry is the largest consumer of Talc and generally uses talc with 80% to 96% brightness. Talc is used in three stages of paper making:
to give smoothness, porosity and opacity to paper in addition to reducing the cost.
control Pitch and Stikies
... during the paper making process, oleo resinous droplets micro or colloidal in nature get added to the stream. These micro impurities can clog the paper machinery. Talc being hydrophobic absorbs these micro droplets or if the droplets are big then talc lamellae stick to their surface thus controlling their stickiness
... because of its platy ness and high brightness, talc leads to reduction in usage of expensive whitening and helps in controlling gloss of the coat. Talc also provides smoothness to the surface and imparts opacity to the coat.
Talc is used in both uncoated and coated rotogravure papers where it improves printability as well as reducing surface friction, giving substantial improvements in productivity at the paper mill and print house. It also improves mattness and reduce ink scuff in offset papers.
As opposed to chemical pitch-control products that pollute the process water, talc is removed together with the pulp, enabling the papermaker to operate more easily in closed-circuit. In specialty papers such as colored papers or labels, talc helps to improve quality and productivity
Talc reduces the viscosity of rubber compounds, thereby facilitating the processing of molded parts. It also improves extrudate qualities, increasing production rates and enhancing UV radiation resistance of exterior parts such as automotive profiles. In sealants and gaskets, they provide good compression resistance, while in pharmaceutical stoppers, they create a barrier against liquids. In cables, talc functions as insulators and in tire manufacture it makes excellent processing aids.
Although a small user, the pharmaceutical industry requires highly pure, specialized and bacteria free talc for Tablets, Ointments and Dusting. The thermal & chemical inertness of talc makes it an ideal filler.
The pharmaceutical talc is processed to remove impurities like iron oxide, dolomite, carbon, magnesium and carbonate minerals
Fertilizer anti caking
Hydrophobic talc prevents agglomeration of NPK fertilizers. Best results are achieved with platy talc's, which give the most efficient anti caking effect under load over time.
Mould surfaces with talc coating improve the quality and appearance of cast metal parts. Pure, inert talc's are required.
Bituminous roofing sheets and asphalt shingles
Talc acts as a lubricant in the production process, and reduces sticking problems in storage.
Food and cosmetics
Talcs are used in a variety of functions, like animal feed anti-caking, olive oil processing aid, chewing gum anti-stick agent, in body powders or make-ups.
Textile industry also prefers talc powder free from grit and coloration, which is used both for loading and bleaching certain types of cotton goods. Inferior grades are used in back filling textiles.
Specialty talc can improve the performance of biological wastewater treatment plants. The talc particles ballast the flocks of bacteria and accelerate their sedimentation. The addition of talc results in top quality discharge and zero bacterial loss. It can help to upgrade plants without resorting to costly plant expansions. As opposed to most chemicals used to clean wastewater, such as chlorine or aluminium salts, talc is a natural, environmentally-friendly mineral additive. And because it is inert, it preserves the fertilizing value of sewage sludge.
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Plant & Machinery
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