ISO 4277-1977 标准详情
- 标准号:ISO 4277-1977
- 中文标题:天然和人造冰晶石-用于评估自由氟化物含量的常规测试
- 英文标题:cryolite,natural and artificial-conventional test for evaluation of free fluorides content
- 标准类别:国际标准化组织标准ISO
- 发布日期:1977-11-15
Applicable to products having contents of AlF3 of more than 0.15 % (m/m) or of NaF of more than 0.4 % (m/m). Covers sintering of a test portion with a known quantity of sodium fluoride in a muffle furnace at a temperature of (790 10) °C. Under th
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