The nature of the particle size & shape will tend to produce slip or a form of lubricity. It is some what difficult to disperse in conventional plastic mixing equipment due to overall tendency for more bulking. The material is less sensitive to pH changes; therefore, it can be used in applications where minor acidity is a problem.
Talc, as filler for plastics, has some special applications. Generally, it is used not as the sole filler in molding formulae but in combination with other filler materials. It facilitates removal from molds, helps achieve a better sheen or gloss on parts, and lowers the extrusions die wear through its lubricating effect. It is also an effective anti-blocking agent. Talc promotes better fire retardancy and aids in processing and final application of various plastic sealants and mastics. It is also useful as an aid in certain color applications, as filler for parts in contact with acids, and as a viscosity modifier to accomplish some improvement of overall finished product physical properties.
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