ISO 6796:1981
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Polyglycols for industrial use — Determination of hydroxyl number — Phthalic anhydride esterification method
Hardcopy , PDF
English, French
01-09-1981
02-05-2025
The hydroxy groups present in a test portion are esterified with phthalic anhydride. The excess phthalic anhydrids is hydrolyzed and the phthalic acid formed is neutralized with standard volumetric sodium hydroxide solution. If the sample contains free acidity or alkalinity a corresponding correction is made. From the corrected hydroxyl number, the apparat relative molecular mass may be calculated by a formula given.
| Committee |
ISO/TC 47
|
| DocumentType |
Standard
|
| Pages |
3
|
| PublisherName |
International Organization for Standardization
|
| Status |
Withdrawn
|
| Standards | Relationship |
| NFT 20 667 : 1984 | Identical |
| NBN T 04 151 : 1983 | Identical |
| UNE 55717:1984 | Identical |
| BS ISO 14900:2017 | Plastics. Polyols for use in the production of polyurethane. Determination of hydroxyl number |
| ASTM D 4274 : 2016 : REDLINE | Standard Test Methods for Testing Polyurethane Raw Materials: Determination of Hydroxyl Numbers of Polyols |
| 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 |
| DIN 53240-2:1998-10 | DETERMINATION OF HYDROXYL VALUE - PART 2: METHOD WITH CATALYST |
| DIN 53240-2:2007-11 | DETERMINATION OF HYDROXYL VALUE - PART 2: METHOD WITH CATALYST |
| ISO 15063:2011 | Plastics — Polyols for use in the production of polyurethanes — Determination of hydroxyl number by NIR spectroscopy |
| ISO 2211:1973 | Liquid chemical products — Measurement of colour in Hazen units (platinum-cobalt scale) |
| ISO 1389-6:1977 | Phthalic anhydride for industrial use — Methods of test — Part 6: Determination of phthalic anhydride content — Titrimetric method |
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