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The thermal conductivity, electrical resistivity, Lorenz number, thermoelectric force, and thermoelectric power are given in the temperature range 4–120°K for ten aluminums and aluminum alloys: high‐purity, 1100‐F, 1100‐O, 3003‐F, 2024‐T4, 5052‐O, 5083‐O, 5086‐F, 5154‐O, and 6063‐T5. Four of the samples show a maximum in thermal conductivity, the others do not. For the four high‐thermal conductivity samples the separate components in the electronic thermal resistivity are resolved; for the others, components in both the electronic and the lattice thermal resistivities are given. The residual electrical resistivities vary from 2.5×10-8 to 3.2×10-6 ohm cm. The Lorenz numbers for the high‐conductivity samples fall considerably below the Sommerfeld value 2.44×10-8 watt‐ohm/°K2; those for the low‐conductivity samples are somewhat above the Sommerfeld value. The thermoelectric power of some of the the alloys is positive with respect to the high‐purity sample, for others it is negative. The various properties, methods of analysis, and separation of components are discussed in detail.