Process for the preservation of wood and the like so that the preserving substance cannot be washed out

摘要

377,441. Preserving wood. FALCK, R., 75, Veckerhagenerstrasse, M³nden, Hanover, Germany. Aug. 4, 1931, No. 22104. [Class 140.] Wood, cellulose, straw and other fibrous materials are preserved by impregnation with aqueous solutions of arsenic compounds, together with chromic acid, chromates or bichromates, in such proportions as to render the arsenic compound insoluble and to prevent it from being washed out by water. The proportions specified are one part of arsenic acid and 1À25-1À75 parts of potassium bichromate in 100 parts of water.