ISO 14899:2022

Plastics - Polyols for use in the production of polyurethanes - Determination of basicity

This document specifies a method for the measurement of trace amounts of basic materials present in polyether polyols used in the production of polyurethanes. It is important to know the trace amount of basicity in a polyol to prevent gelation of the reaction mass during the production of polyurethane prepolymers. It is also useful to control the basicity in polyols used for polyurethane production to assure consistent and reproducible reaction behaviour. This method is suitable for quality control, as a specification test and for research. The applicable range is 0 μg to 50 μg/g, expressed as KOH. The method is not applicable to amine-based polyols. The values can be reported as CPR (controlled polymerization rate) units.

Plastiques — Polyols pour la production de polyuréthannes — Détermination de la basicité

General Information

• Status: Published
• Publication Date: 31-May-2022
• 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: 6060 - International Standard published
• Start Date: 01-Jun-2022
• Due Date: 12-Apr-2023
• Completion Date: 01-Jun-2022

Relations

• Revises: ISO 14899:2001 - Plastics - Polyols for use in the production of polyurethane - Determination of basicity
• Effective Date: 06-Jun-2022

Overview

ISO 14899:2022 specifies a laboratory method for the determination of trace basicity in polyether polyols used in polyurethane production. The standard defines a controlled polymerization rate (CPR) titration procedure that quantifies basic contaminants in the range 0 μg to 50 μg KOH/g (reportable as μg KOH/g or CPR units). Measuring basicity is critical to prevent gelation during prepolymer manufacture and to ensure consistent, reproducible reaction behaviour in polyurethane processes.

Keywords: ISO 14899:2022, polyols basicity, CPR analysis, polyurethanes, titration method, quality control.

Key topics and technical requirements

• Scope and applicability
  • Method for trace basicity in polyether polyols (not applicable to amine-based polyols).
  • Suited for quality control, specification testing and research.
• Principle
  • A 30 g test portion is diluted with methanol and titrated with 0.01 mol/L HCl; results are corrected by a methanol blank and reported as CPR or μg KOH/g.
• Apparatus and reagents
  • Autotitrator capable of multiple end points with suitable electrodes, 5 ml burette range, recorder.
  • Balance (weigh 30 g to ±1 mg), 100 ml titration flask, magnetic stirrer, reagent-grade methanol and standardized HCl.
• Procedure highlights
  • Use the last inflection point on the titration curve where multiple breaks occur.
  • Blank methanol titration must consume < 0.2 ml of 0.01 mol/L HCl.
• Calculation and reporting
  • CPR value (microequivalents of base per 30 g test portion) and μg KOH/g conversions provided; report CPR to nearest 0.1 unit.
• Precision
  • Repeatability (single analyst): suspect if duplicate results differ by > 0.2 CPR units.
  • Reproducibility (multilaboratory): suspect if means differ by > 0.6 CPR units.
• Safety and quality
  • Follow normal laboratory practice; use reagent-grade chemicals and ISO-referenced water (ISO 3696).

Applications and users

• Who uses ISO 14899:2022
  • Quality control laboratories in polyurethane and polyol manufacturing.
  • R&D teams developing polyols and prepolymers.
  • Suppliers certifying polyol batches to avoid gelation and control reaction rates.
• Practical benefits
  • Prevents production downtime from gelation.
  • Ensures reproducible polymerization kinetics in foam, elastomer and coating formulations.
  • Useful for specification testing and supplier qualification.

Related standards

• ISO 3696 (water for analytical use)
• ISO 6353 series (reagents for chemical analysis)
• JIS K 1557 (related CPR practice)
• ASTM E 180 (precision estimation methodology)

ISO 14899:2022 is the industry-recognized method for trace basicity measurement in polyether polyols, supporting reliable polyurethane production and quality assurance.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 14899
Second edition
2022-06
Plastics — Polyols for use in the
production of polyurethanes —
Determination of basicity
Plastiques — Polyols pour la production de polyuréthannes —
Détermination de la basicité
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
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ISO copyright office
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Sampling . 2
6 Interferences . 2
7 Reagents . 2
8 Apparatus . 2
9 Procedure .3
10 Expression of results . 3
11 Precision and bias .3
11.1 Precision . . . 3
11.2 Bias . 4
12 Test report . 4
Bibliography . 5
iii
Foreword
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different types of ISO documents should be noted. This document was drafted in accordance with the
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12,
Thermosetting materials.
This second edition cancels and replaces the first edition (ISO 14899:2001), of which it constitutes a
minor revision. The changes are as follows:
— the title has been changed to plural form to read: "Plastics — Polyols for use in the production of
polyurethanes — Determination of basicity".
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
This method is for the determination of trace amounts of basicity in polyether polyols, which are used
in the preparation of polyurethane prepolymers and polyurethane products. Knowledge of this value
is important to prevent gelation during prepolymer production and to control reaction rates during
polyurethane preparation. The method, known as the controlled polymerization rate (CPR) analysis,
has become an accepted industry practice, a version of which has been published as part of JIS K 1557.
v
INTERNATIONAL STANDARD ISO 14899:2022(E)
Plastics — Polyols for use in the production of
polyurethanes — Determination of basicity
WARNING — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all of the safety problems, if any, associated with its
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