| 摘要 |
1318718 Refractory compositions OSTERTAG-WERKE AG 12 Nov 1970 [15 Nov 1969] 53909/70 Heading C1J An armoured wall comprises hard fragments resistant to mechanical action embedded in a mixture of basalt and slag. Blast furnace and copper slags are specified whilst the hard fragments are of one or more of MgO, ZrO 2 , Al 2 O 3 and SiO 2 , and they can be arranged in layers. |
