ISO 17710:2002

Plastics — Polyols for use in the production of polyurethane — Determination of degree of unsaturation by microtitration

This International Standard specifies a microtitration method to measure the degree of unsaturation in polyether polyols used in the production of polyurethanes. It is based on the reaction of mercuric acetate with double bonds in the polyol. It does not apply to compounds in which the unsaturation is conjugated with carbonyl, carboxyl or nitrile groups. The product being measured must be essentially dry and free of inorganic salts, especially halides.

Plastiques — Polyols pour la production du polyuréthanne — Détermination du degré de non-saturation par microtitrage

General Information

• Status: Withdrawn
• Publication Date: 05-Jun-2002
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: ISO/TC 61/SC 12 - Thermosetting materials
• Drafting Committee: ISO/TC 61/SC 12 - Thermosetting materials
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 20-Jun-2023

Relations

• Revised: ISO 17710:2023 - Plastics — Polyols for use in the production of polyurethanes — Determination of degree of unsaturation by microtitration
• Effective Date: 17-Sep-2022

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 17710
First edition
2002-05-15
Plastics — Polyols for use in the production
of polyurethane — Determination of degree
of unsaturation by microtitration
Plastiques — Polyols pour la production du polyuréthanne — Détermination
du degré de non-saturation par microtitrage

Reference number
ISO 17710:2002(E)
©
ISO 2002

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ISO 17710:2002(E)
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ISO 17710:2002(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Application . 2
6 Interferences . 2
7 Reagents . 2
8 Apparatus . 3
9 Sampling . 3
10 Procedure . 3
11 Expression of results . 4
12 Precision and bias . 4
13 Test report . 5
Bibliography. 6
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ISO 17710:2002(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 17710 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12,
Thermosetting materials.
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ISO 17710:2002(E)
Introduction
Standards have been published which deal with the measurement of the degree of unsaturation in polyols used for
the production of polyurethane plastics (ASTM D 4671, JIS K 1557, part 6.7). These standards are based on the
reaction of mercuric acetate with the unsaturation present in the molecule. The method described in this International
Standard relies on the same chemistry, but is a microtitration method which uses less reagent and therefore reduces
the disposal problems associated with mercury compounds. It is based primarily on ASTM D 4671.
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INTERNATIONAL STANDARD ISO 17710:2002(E)
Plastics — Polyols for use in the production of polyurethane —
Determination of degree of unsaturation by microtitration
WARNING — Persons using this International Standard should be familiar with normal laboratory practice.
This standard does not purport to address all of the safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices, and to ensure
compliance with any national regulatory conditions prior to use.
1 Scope
This International Standard specifies a microtitration method to measure the degree of unsaturation in polyether
polyols used in the production of polyurethanes. It is based on the reaction of mercuric acetate with double bonds in
the polyol. It does not apply to compounds in which the unsaturation is conjugated with carbonyl, carboxyl or nitrile
groups. The product being measured must be essentially dry and free of inorganic salts, especially halides.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods
ISO 4787:1984, Laboratory glassware — Volumetric glassware — Methods for use and testing of capacity
ISO 6353-1:1982, Reagents for chemical analysis — Part 1: General test methods
ISO 6353-2:1983, Reagents for chemical analysis — Part 2: Specifications — First series
ISO 6353-3:1987, Reagents for chemical analysis — Part 3: Specifications — Second series
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
unsaturation
property of a compound or polymer distinguished by the presence of a carbon-to-carbon double bond
3.2
polyol
organic compound which contains two or more hydroxyl groups capable of reacting with isocyanates to form
polyurethanes
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ISO 17710:2002(E)
3.3
polyurethane
polymer prepared from the reaction of an organic di- or polyisocyanate with compounds containing two or more
hydroxyl groups
4Principle
Carbon-to-carbon unsaturated compounds in the sample are reacted with mercuric acetate and methanol in a
methanolic solution to produce acetoxymercuricmethoxy compounds and acetic acid. The amount of acetic acid
released is determined by microtitration with standard alcoholic potassium hydroxide and the result used to calculate
the amount of unsaturation originally present. Because the acid cannot be titrated in the presence of excess mercuric
acetate, sodium bromide is added to convert the mercuric acetate to the corresponding bromide, which does not
interfere with the titration. A suitable correction must be applied if
...