ISO 21257:2018 PDF

Name: ISO 21257:2018 — Plastics — Polymer polyols for use in the production of polyurethane — Determination of the residual acrylonitrile and styrene monomer content by gas chromatography
SKU: ISO 21257:2018
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Plastics — Polymer polyols for use in the production of polyurethane — Determination of the residual acrylonitrile and styrene monomer content by gas chromatography

Название (английский):

ISO 21257:2018

Plastics — Polymer polyols for use in the production of polyurethane — Determination of the residual acrylonitrile and styrene monomer content by gas chromatography

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 3 октября 2018 г.
Издание:: ISO IS 21257 edition 1 version 1
ICS:: 83.080.10

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Описание (английский):

This document specifies a method for the determination of the residual acrylonitrile monomer and styrene monomer in polymer polyols by gas chromatography.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21257:2018 specifies a gas chromatography (GC) method for the determination of residual acrylonitrile and styrene monomers in polymer polyols used to produce polyurethane. The standard describes sample preparation, GC hardware and operating requirements, calibration procedures and result expression to support reliable measurement of these toxic residual monomers in polymer polyols.

Key topics and technical requirements

Scope: Measurement of residual acrylonitrile and styrene monomer content in polymer polyols by GC.

Analytical principle: Dissolve sample in a suitable solvent, analyse by GC with internal standardisation, and quantify monomers from peak areas using a calibration curve.

Columns and injection: Supports both open tubular (OT/capillary) columns and packed columns; split or splitless injection is allowed. Two preparation methods are provided (Method A for OT columns, Method B for packed columns).

Detector and gases: Uses a flame ionization detector (FID); carrier gases such as helium or nitrogen and hydrogen/dry air for the flame are recommended.

Solvents and internal standards: Acceptable solvents include methanol, N,N‑dimethylformamide (DMF), tetrahydrofuran (THF), dipropylene glycol monomethyl ether, and toluene. Internal standard selection depends on retention times; recommended pairings (e.g., methanol with 2‑methyl‑1‑propanol, DMF with ethylbenzene) are provided.

Calibration and quantification: Four-level calibration is required; procedures for both multi-point calibration curves and single‑point calibration are included. Results are calculated from peak-area ratios.

Sample preparation details: Example sample masses in the standard: 4 g sample for OT-column method, 10 g sample for packed-column method, with defined volumetric dilutions and internal standard additions.

Quality and maintenance notes: Warns of injector contamination from high‑molecular-weight polymer components; recommends monitoring and cleaning/replacing injector parts and using a liner with glass wool where helpful.

Reporting and performance: Sections cover acceptability of results, measurement sensitivity, precision data and reporting requirements.

Applications and who uses it

Polymer polyol manufacturers performing QC and release testing.

Polyurethane foam and component makers verifying residual monomer levels for product safety and performance.

Independent testing laboratories providing compliance testing for clients.

Regulatory and safety teams assessing toxicant exposure risks (food‑contact, skin contact, furniture/cushioning).

Use cases include routine QC, supplier verification, product development and regulatory compliance documentation.

Related standards

ISO 472 - Plastics - Vocabulary

ISO 648 - Laboratory glassware - Single‑volume pipettes

ISO 1042 - Laboratory glassware - One‑mark volumetric flasks

Keywords: ISO 21257:2018, polymer polyols, residual acrylonitrile, residual styrene, gas chromatography, GC method, flame ionization detector, internal standard, polyurethane testing, polymer polyol analysis.

ISO 21257:2018 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

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