Page 333 - Handbook of Plastics Technologies

PLASTICS ADDITIVES

PLASTICS ADDITIVES 5.13

TABLE 5.11 Polypropylene UV Stabilization:
Laboratory-Accelerated UV to 50 Percent Loss of
Tensile Strength

Stabilizer Hours
None 350
0.50 percent UV absorbers 800–2000
0.25 percent HALS 4000
0.50 percent HALS 6800

TABLE 5.12 ABS UV Stabilization: Retention of
2
20 kg/m Impact Strength After Lab-Accelerated
UV Aging
Stabilizer Hours

None 225
1 percent UV absorber 500
1 percent HALS 1225
0.5 percent UVA + 0.5 percent HALS 2000

TABLE 5.13 Polycarbonate UV Stabilization:
Laboratory-Accelerated UV Aging to Yellowness
Index +5
Unstabilized 700 hr
0.25 percent UV absorbers 2800 hr

TABLE 5.14 ABS Stabilization by Carbon Black
Impact Strength Retained After Five Years Outdoor
Weathering

Natural color 40%
Black 82%

absorber and is useful especially when combined with organic synergists, typically in
HDPE and polypropylene.
5.1.4.3 Quenchers. When a polymer absorbs UV energy, it may be able to dispose of it
harmlessly by intermolecular transfer to certain additives that can then carry the energy
away and dispose of it harmlessly. These additives are referred to as energy quenchers. Or-

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