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698 CHAPTER 65 R 1962 Guide And Data Book * R Cryogenics K 699 THERMAL CONDUCTIVITY, w u ttl /cm deg K Fig. 23 .... Thermal Conductivities of Selected Materiab Fig. 24 .... Thermal Conductivities of Commercial Coppers Fig. 25 .... Thermal Conductivities of Commercial Aluminums Fig. 26 .... Thermal Conductivities of Aluminum Alloy* fig. 27.... Tensile Strengths of Selected Materials (All m Annealed Condition Except the Two Aluminum Alloys) techniques welded and brazed joints can be made with little or so loss of strength in the heated zone. Figs. 27 and 28 give strengths of selected metals and alloys. The data for lead-tin solder are for short-duration loading. Fatigue of soft solder tinder static load at ambient temperature has been demon strated. With the exception of Teflon, plastics are embrittled at low temperatures. However, fiber-reinforced plastics can show Pod properties. Among the film-forming plastics, Mylar re tains good flexibility even at 40 R (Table II). REFERENCES * P. Peteraen: Sartryck ur Tuf (29, 4, 1938, p. 151). &. H. Kropschot: Multiple layer insulation for cryogenic "Ppheations {Cryogenic*. 1, No. 3, 1961, p. 171). e R. H. Kropschot: Cryogenic Initiation (ASHRAE Journal, "Ptember 1959, p. 48). BIBLIOGRAPHY R. Berman, E. L. Foster, and H. M. Rosenberg: British J<*nui of Applied Physics, VoL 6, 1955, p. 181). ymmthly Btitctin of abstract* of current literature (Interg*wnal Institute'of Refrigeration, 177, Boulevard Malesherbes, tJr- f- Corroccini: Properties of materials at low temperatures 'S+aucal Engineering Progress, Vol. 53, 1957, p. 262, 342, 397). Davies: Physical Principals of Gas Liquefaction and Rectification (Longmans, Green and Company, Fig. 28 .... Yield Strengths of Selected Materiab (All in Annealed Condition Except the Two Aluminum Alloys---0.2% Offset Except as Noted) J. Dyment and H. Ziebland: Ministry of Supply, Explosives Research and Development Establishment (Great Britain) Report 24/R/55, 1955. M. M. Fulk: Evacuated powder insulation for low tempera tures (Progress m Cryogenics, VoL 1, K. Mendelssohn, Editor, Heywood & Co., Ltd., London, 1959). W. E. Gifford: Proceedings of the Cryogenic Engineering Con ference, 1956, p. 1. W. J. Hau, R. L. Powell, and H. M. Roder: Proceedings of the Cryogenic Engineering Conference, 1957. C. B. Hood ana R R. Grilley: Renew of Scientific Instruments, VoL 23, No. 7, 1952. W. H. Keesom: Helium (Elsevier Publishers, Amsterdam). R, B. Keimard: Kinetic Theory of Gases (McGraw-Hill Book Co., New York, 1938, p. 315-320). H. - L. Laquer: AECD-3706 (Office of Technical Services, Dept, of Commerce, Washington 25, D. C.). H. L. Laquer and E. L. Head: AECU-2161, LADC-1230 (AEC Technical Information Service, Oak Ridge, Tenn., September 1952). W. H. McAdams: Heat Transmission (McGraw-Hill Book Co., New York). Mechanical Properties of Metals at Low Temperatures (National Bureau of Standards Circular 520, 1951). K. Mendelssohn, Editor: Progress in Cryogenics (Academic Press, New York, Vols. 1-3, 1959-61). Metals Handbook (ASM, 1948). National Bureau of Standards, Cryogenic Engineering Labora tory, Boulder, Colorado; maintains a mechanized bibliography file of cryogenic literature. R. L. Powell and W. A. Blanpied: Thermal Conductivity of