Timbers for battery separators.
Forty species from Australia and the S.W. Pacific area were tested for electrical resistance. Mn content, dimensional changes, handling properties, flexibility angle and breaking radius, and the effect on mechanical strength of treatment with acid, and were given life and service tests. Tabulated results show that only 7 species are thoroughly satisfactory. These are: Agathis palmerstonii and A. microstachya, Araucaria bidwillii, Phyllocladus rhomboidalis, Araucaria cunninghamii, Dacrydium franklinii and Araucaria klinkii. Pinus radiata was satisfactory in a life test, and its suitability should be tested commercially. Dyera costulata gave good results in a limited life and service test, but because of mechanical weakness would need extended service tests. Athrotaxis selaginoides proved suitable only for stationary batteries because of low resistance to mechanical abrasion. Daphnandra micrantha, Agathis macrophylla and Sloanea woolsii would probably justify further testing if supplies of the more suitable species were short. KEYWORDS: Acaciafarnesiana microstachya \ Acaciafarnesiana palmerstonii \ Agathis macrophylla \ Araucaria bidwillii \ Araucaria cunninghamii \ Araucaria klinkii \ Athrotaxis selaginoides \ Battery separators \ Dacrydium franklinii \ Daphnandra micrantha \ Dyera costulata \ Phyllocladus rhomboidalis \ Pinus ra