Mica filled grades

Dover Chemical quotes data from Ford Motor Co. that its Hordaresin NP 70 and Chlorez 700 grades can also function as coupling agents in mica-filled polypropylene. The compounds show sufficiently low cost and high modulus to make them economic replacements for certain applications where steel is normally used. Use of lower-cost mica in place of glass fibre can also offer potentially large cost savings. 

The clarity, toughness and barrier properties make PET best suited for its primary market - blow-moulded carbonated soft drinks containers. Speciality grades include flame retardant, impact modified and glass, mineral, carbon, PTFE and mica filled. 

Compounded mica filled polypropylenes are available from a number of manufacturers, with however a large offer from India (where are the largest deposits of mica). Grades up to 40% are marketed and Table 6.11 is a compilation of typical average properties, based on manufacturers data sheets. 

Figure 10.9 shows the results of the measurements on an experimental UHMW-PP sample as such and filled with 20 %v. of mica. A standard J-grade PP, filled and non-filled, was measured as reference system. The dynamic stiffness of both reference systems is for temperatures below 160°C higher than that of both UHMW-PP systems due to a difference in crystallinity, x(c) as determined by DSC ... 

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