Use Of Talc In Plastic

Talc is used as an important functional filler for manufacturing of compounded thermo-plastic and thermoset polymers. Because of its useful characteristics like platy particle shape & purity, it is used in plastic primarily as reinforcing filler. It helps increase the stiffness of polypropylene by 80% at a 20% loading and by 150% at a 40% loading. It also helps to reduce mold shrinkage, increase the heat resistance of polypropylene, reduce molding cycle time, and improve melt rheology. When compared to other reinforcing fillers, such as fiberglass and mica, talc is much less abrasive. It is used to give polypropylene superior low-temperature shock resistivity. Talc is used as an anti-block agent in polyethylene film, an additive that roughens the surface of tacky film to prevent it from adhering to itself. Loading levels can range from 0.5 to 1.0%. Talc is used in improving the hot strength of profile extrusions in vinyl and in reducing the shrinkage of floor tile. Fine particle size grades of high quality talc are used as nucleating agents for polyesters, nylon, semi-crystalline polyolefins, and chlorinated polyethylene. Talc can also be used in polyolefins at loading levels ranging from 1 to 50% by weight.

Talc particles are a series of very small particles that are plate-shaped and they, when aligned, make possible a finished part with improved physical properties. Due to its nature the particle size & shape tends to produce slip or sort of lubricity. It's dispersion is somewhat difficult in conventional plastic mixing equipment due to its overall tendency for more bulking. Its sensitivity to pH changes is low; therefore, it can be used in applications where minor acidity is a problem. Talc, when used as filler in the manufacturing of plastics, has some unique applications. It is generally not used as the only filler in molding formulae but in combination with other filler materials. It helps in removal from molds, achieve a better shine or gloss on parts, and through its lubricating effect it lowers the extrusions die wear. It is also used as an effective anti-blocking agent. Talc promotes better fire retardancy and helps in processing and final application of mastics and various plastic sealants. Talc is also a useful substance when used as an aid in certain color applications, as a viscosity modifier to accomplish some improvement of overall finished product physical properties and as filler for parts in contact with acids OMPLAS exhibits following characteristics:

• Platy particle shape.
• Whiteness.
• Chemical inertness
• Electrical resistivity
• Super fine particle size
• Low abrasion
• Powder bulk density