Page 347 - Handbook of Plastics Technologies

PLASTICS ADDITIVES

PLASTICS ADDITIVES 5.27

TABLE 5.25 Summary of Fillers and Reinforcements
Extender Reinforcing Short Continuous
Property Fillers Fillers Fibers Fibers

Melt processability ± ± – – –
Modulus + + ++ ++
Creep resistance + + ++ ++
Strength – + + ++
Impact strength – ± ± ++

Friction ± + + +
Abrasion resistance + + + +
Thermal conductivity + + + +
Coeff. of thermal exp. – – – – – –
Heat deflection temp. + + + +

Flame retardance + + + +
Transparency – – – –
Cost ± + + ++

5.2.7 Markets
Approximate U.S. tonnage of fillers and reinforcements for plastics is about 16 billion
pounds per year (Tables 5.26 and 5.27).

TABLE 5.26 Leading Fillers and Reinforcements
Substance Millions of lb

Calcium carbonate 8500
Glass Fiber 4000
Alumina trihydrate 520
Clay 510
Titanium dioxide 490
Wollastonite 370
Talc 320
Silica 250

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