Page 344 - Handbook of Plastics Technologies

PLASTICS ADDITIVES

5.24 CHAPTER 5

TABLE 5.19 Maximum Properties of Reinforced Plastics
Epoxy/glass Modulus to 5,500,000 psi
Flexural strength to 70,000 psi
Impact strength to 10 fpi
HDT to 600°F
Thermoset polyester/glass Modulus to 3,000,000 psi
Flexural strength to 80,000 psi
Impact strength to 30 fpi
HDT to 500°F

TABLE 5.20 Impact Strength of Reinforced
Nylon 6,6
Fiber length, inches fpi

0.500 7.5
0.375 6.5
0.250 5.5
0.125 3.0

TABLE 5.21 Properties of Reinforced Nylon 6,6
Glass content, % 0 10 20 30 40 50 60
Flexural modulus, 410 650 850 1300 1600 2200 2800
kpsi

Flexural strength, 15 20 29 38 42 47 50
kpsi
Tensile strength, 12 14 19 27 31 32 33
kpsi
Impact strength, 0.9 0.8 1.2 2.0 2.6 2.6 2.6
fpi
HDT, °F/264 psi 150 485 485 490 500 500 500
Thermal expansion, 4.5 2.7 2.3 1.8 1.4 1.0 0.9
–5
10 /°F

5.2.5 Specialty, or “Functional” Fillers
Aside from their use for economics or mechanical reinforcement, a number of fillers are
used to improve a variety of specific properties, as described below.
5.2.5.1 Lubricity and Abrasion Resistance. In plastic gears and bearings, these quali-
ties are improved by adding solid powders such as brass, molybdenum sulfide, graphite,
polyethylene, and especially polytetrafluoroethylene.

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