| 摘要 |
1,217,199. Reducing permeability in soil. BORDEN CHEMICAL CO. (UK) Ltd. 24 Nov., 1969 [19 Dec., 1968], No. 60524/68. Heading E1F. The permeability of porous soil is reduced by injecting a paraffin wax in molten state and maintaining the formation at a temperature above the melting point of the wax until the desired penetration of wax is achieved. |
