SOME time ago a series of tests were described in these columns on synthetic rubber‐like materials in certain oils, including one to DTD.44B specification. Since that time there has been much further development of these new materials and, in particular, a Buna type of synthetic rubber has become available in this country. These German products were not available for export until the latter part of 1937, and, in fact, prior to that time severe penalties were imposed to prevent even samples being surreptitiously taken out of the country. Only one type is available up to the present, a modified Buna N, called in this country Perbunan, but this is the type most suitable for use in oil and solvent resisting rubbers.
Garner, T.L. (1938), "Synthetic Rubber‐Substitutes: Some Properties of the Various Types of Material Available", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 7, pp. 212-217. https://doi.org/10.1108/eb030337
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