ISO 4277:1977
Withdrawn
Cryolite, natural and artificial — Conventional test for evaluation of free fluorides content
Hardcopy , PDF
English, French
11-01-1977
02-16-2019
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 these conditions, aluminium fluoride in excess of that required by the stoichiometric formula AlF3 .3NaF reacts to form cryolite; extraction of the ground sintered mass with boiling water. Acidification with hydrochloric acid solution to a pH less than 3.7 and titration of the excess sodium fluoride with thorium nitrate solution in the presence of alizarin-S as indicator. Has also been approved by the IUPAC.
| Committee |
ISO/TC 226
|
| DocumentType |
Standard
|
| Pages |
3
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NBN T 03 445 : 1983 | Identical |
| BS 4993-5:1980 | Methods of test for aluminium fluoride for industrial use Determination of moisture content (Karl Fischer method) |
| BS 4993-9:1980 | Methods of test for aluminium fluoride for industrial use Determination of sulphur content (X-ray fluorescence spectrometric method) |
| BS 5050-11(1980) : 1980 | METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULPHATE CONTENT |
| BS 5050-9(1980) : 1980 | METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (KARL FISHER METHOD) |
| ISO/TR 4277:2009 | Cryolite, natural and artificial — Conventional test for evaluation of free fluorides content |
| BS 4993-8:1980 | Methods of test for aluminium fluoride for industrial use Determination of sulphate content |
| BS 5050-13(1983) : 1983 | METHODS OF TEST FOR CRYOLITE - DETERMINATION OF PHOSPHORUS CONTENT |
| BS 5050-10(1980) : 1980 | METHODS OF TEST FOR CRYOLITE - DETERMINATION OF MOISTURE CONTENT (GRAVIMETRIC METHOD) |
| BS 5050-12(1980) : 1980 | METHODS OF TEST FOR CRYOLITE - DETERMINATION OF SULFUR CONTENT (X-RAY FLUORESCENCE SPECTROMETRIC METHOD) |
| BS 4993-10:1983 | Methods of test for aluminium fluoride for industrial use Determination of phosphorus content |
| PD ISO/TR 4277:2009 | Cryolite, natural and artificial. Conventional test for evaluation of free fluorides content |
| BS 4993-6:1980 | Methods of test for aluminium fluoride for industrial use Determination of moisture content (gravimetric method) |
Please Login or Create an Account so you can add users to your Multi user PDF Later.
Important note : All end users must be registered with an Account prior to user licenses being assigned.
Users cannot be edited or removed once added to your Multi user PDF.