Fundamentals of Materials Science and Engineering: An Integrated Approach, 3e

GTBL042-16 GTBL042-Callister-v2 September 13, 2007 13:10

Revised Pages

696 • Chapter 16 / Corrosion and Degradation of Materials

Table 16.4 Resistance to Degradation by Various Environments for Selected Plastic Materialsa

Aqueous

Nonoxidizing Oxidizing Salt Aqueous Polar Nonpolar

Acids Acids Solutions Alkalis Solvents Solvents

Material (20% H 2 SO 4 )(10% HNO 3 )(NaCl)(NaOH)(C 2 H 5 OH)(C 6 H 6 ) Water

Polytetrafluoro- S S S S S S S

ethylene

Nylon 6,6 U U S S Q S S

Polycarbonate Q U S U S U S

Polyester Q Q S Q Q U S

Polyetherether- S S S S S S S

ketone

Low-density S Q S — S Q S

polyethylene

High-density S Q S — S Q S

polyethylene

Poly(ethylene S Q S S S S S

terephthalate)

Poly(phenylene S Q S S S U S

oxide)

Polypropylene S Q S S S Q S

Polystyrene S Q S S S U S

Polyurethane Q U S Q U Q S

Epoxy S U S S S S S

Silicone Q U S S S Q S

aS=satisfactory; Q=questionable; U=unsatisfactory.

Source:Adapted from R. B. Seymour,Polymers for Engineering Applications,ASM International, Materials Park,

OH, 1987.

metals as well as etch and dissolve glass, so it is stored in plastic bottles. A qualitative

comparison of the behavior of various polymers in these solutions is also presented

in Tables 16.4 and 16.5. Materials that exhibit outstanding resistance to attack by

both solution types include polytetrafluoroethylene (and other fluorocarbons) and

polyetheretherketone.

Table 16.5 Resistance to Degradation by Various Environments for Selected Elastomeric Materialsa

Weather- Alkali Acid Chlorinated Aliphatic Animal,

Sunlight Ozone Dilute/ Dilute/ Hydrocarbons, Hydrocarbons, Vegetable

Material Aging Oxidation Cracking Concentrated Concentrated Degreasers Kerosene, Etc. Oils

Polyisoprene D B NR A/C-B A/C-B NR NR D-B

(natural)

Polyisoprene NR B NR C-B/C-B C-B/C-B NR NR D-B

(synthetic)

Butadiene D B NR C-B/C-B C-B/C-B NR NR D-B

Styrene- D C NR C-B/C-B C-B/C-B NR NR D-B

butadiene

Neoprene B A A A/A A/A D C B

Nitrile (high) D B C B/B B/B C-B A B

Silicone A A A A/A B/C NR D-C A

(polysiloxane)

aA=excellent, B=good, C=fair, D=use with caution, NR=not recommended.

Source:Compound Selection and Service Guide,Seals Eastern, Inc., Red Bank, NJ, 1977.