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Omya Fillers in the
Plastics Industry
 There
are many different mineral fillers used in the plastics industry.
The main ones are natural, ground calcium carbonate, precipitated
calcium carbonate, barium sulphate (barytes), talc, mica, and china
clay (kaolin).
The use of fillers and reinforcing additives
is confined mainly to four classes of polymers viz. polyvinyl chloride
(PVC), unsaturated polyesters, polyolefines and polyamides. The
amounts used in these polymers are more than in all the others put
together.
Calcium carbonate (CaCO3) is the predominant
filler used in polyvinyl chloride (PVC) compounding. Selection of
fillers, as is the case with other compounding ingredients, involves
consideration of the available types and their effect on processing,
product properties, and economics. CaCO3 fillers, in
one form or another, generally impart the most favourable balance
of these factors to PVC compounds.
Fine surface treated grades of calcium carbonate
are also well suited for use in Polyolefines. Enhancement of physical
properties can be achieved by incorporation of suitable levels of
our recommended grades. The improved thermal conductivity of calcium
carbonate also allows for faster rates of cooling and increased
output.
 Requirements
of Calcium Carbonate
Mineral
additives for the plastics industry
Physiochemical
aspects of mineral components for plastic processors
Calcium
Carbonate in PVC
Calcium
Carbonate in Polyolefines
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