| 摘要 |
<p>1380890 Glass compositions PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 4 April 1973 [7 April 1972] 16037/73 Heading C1M [Also in Division C7] A glass substrate for a magnetic film formed by electroless deposition (see Divisions C6-7) consists of (% by weight): SiO 2 65À0, 71À5, 75À7: K 2 O 2À7, -, 1À2: B 2 O 3 23À4,-. 6À9 : Al 2 O 3 3À9, 1À5, 5À1:Na 2 O 5À0, 15À0, 6À2 : CaO -, 8À5, 1À3; MgO -, 3À5, - : BaO -, -, 3À6.</p> |
