ISO 4326:1980
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The latest, up-to-date edition.
Non-ionic surface active agents — Polyethoxylated derivatives — Determination of hydroxyl value — Acetic anhydride method
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English, French
01-03-1980
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The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.
| Committee |
ISO/TC 91
|
| DevelopmentNote |
Also numbered as BS 6829-4.6(1988) (09/2005)
|
| DocumentType |
Standard
|
| Pages |
3
|
| PublisherName |
International Organization for Standardization
|
| Status |
Current
|
| Standards | Relationship |
| UNE 55730:1982 | Identical |
| NBN T 63 142 : 1980 | Identical |
| BS ISO 14900:2017 | Plastics. Polyols for use in the production of polyurethane. Determination of hydroxyl number |
| BS ISO 15063:2011 | Plastics. Polyols for use in the production of polyurethanes. Determination of hydroxyl number by NIR spectroscopy |
| ISO 14900:2017 | Plastics — Polyols for use in the production of polyurethane — Determination of hydroxyl number |
| BS 6829-0:1987 | Analysis of surface active agents (raw materials) General introduction |
| ISO 15063:2011 | Plastics Polyols for use in the production of polyurethanes Determination of hydroxyl number by NIR spectroscopy |
| ISO 607:1980 | Surface active agents and detergents Methods of sample division |
| ISO 4314:1977 | Surface active agents — Determination of free alkalinity or free acidity — Titrimetric method |
| ISO 4317:2011 | Surface-active agents and detergents — Determination of water content — Karl Fischer methods |
| ISO 2211:1973 | Liquid chemical products Measurement of colour in Hazen units (platinum-cobalt scale) |
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