| 摘要 |
<p>1402555 Glass fibre composition NATIONAL RESEARCH DEVELOPMENT CORP 14 July 1972 [5 Aug 1971] 36856/71 Heading C1M [Also in Divisions C3 and D2] Glass fibres used to reinforce pozzolanic cements have the following compositions in per cent by weight: (a) 60-0% SiO 2 , 17À6% ZrO 2 , 16À4% Na 2 O, 5À0% CaO, 0À6% Al 2 O 3 , 0À1% TiO 2 , 0À07% Fe 2 O 3 , 0À1% MgO and 0À1% K 2 O; and (b) 61À4% SiO 2 , 18À5% ZrO 2 , 15À9% Na 2 O and 4À2% CaO.</p> |
