EN ISO 119:1998 PDF

Name: EN ISO 119:1998 — Plastics - Phenol-formaldehyde mouldings - Determination of free phenols - Iodometric method (ISO 119:1977)
SKU: EN ISO 119:1998
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Plastics - Phenol-formaldehyde mouldings - Determination of free phenols - Iodometric method (ISO 119:1977)

Название (английский):

EN ISO 119:1998

Plastics - Phenol-formaldehyde mouldings - Determination of free phenols - Iodometric method (ISO 119:1977)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 22 июля 1998 г.
Издание:: CEN EN 119 edition 1 version 1
ICS:: 83.080.10

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Описание (английский):

A semiquantitative method for the determination of the amount of free phenols in phenolic mouldings. Hot water extraction of free phenols from a powdered test portion, iodination of the water extract and backtitration of the excess of iodine with standard volumetric thiosulfate solution.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

EN ISO 119:1998 defines a standardized iodometric method for the semi-quantitative determination of free phenols in phenol-formaldehyde plastics mouldings. This international standard, developed by CEN in alignment with ISO 119:1977, is crucial for assessing the chemical composition and safety of phenolic moulded products. The method focuses on extracting free phenols from powdered samples via hot water, followed by iodination and back titration of excess iodine with a volumetric sodium thiosulphate solution. Accurate measurement of free phenol content is essential due to its influence on the degree of cure and potential contamination risks when phenolic plastics contact foodstuffs or other sensitive materials.

Key Topics

Scope and Field of Application

Suitable for phenol-formaldehyde mouldings made from thermosetting plastics.
Provides a semiquantitative measure of free phenols affecting product quality and safety.
Important for quality control during manufacturing and for regulatory compliance.

Method Principle

Extraction of free phenols using hot water from powdered test material.
Iodination of the aqueous extract in presence of sodium tetraborate.
Back titration of unreacted iodine with standard sodium thiosulphate solution using starch as an indicator.
Calculation based on the stoichiometric reaction between iodine and phenol molecules.

Sample Preparation

Mouldings reduced to powder by filing, milling, grinding, or drilling, carefully avoiding heating.
Sieved to obtain a uniform particle size (nominal aperture of 250 µm).
Extraction performed within 1 hour of powder preparation to ensure consistent results.

Chemical Reagents and Apparatus

Reagents include sodium tetraborate, iodine solution (~0.05 N), sulphuric acid (2 N), standard sodium thiosulphate solution, and starch indicator.
Typical laboratory glassware and equipment like pipettes, burettes, sieve, flasks, and analytical balance are required.

Calculation and Reporting

Results expressed as percentage by mass of phenol (C6H5OH).
Test report must include sample identification, method details, free phenol amount, and date of test.
Method influenced by sample powdering approach, which should be agreed upon when used as a referee method.

Applications

Quality Control of Phenol-Formaldehyde Mouldings

Monitoring curing levels during production to optimize mechanical properties.
Ensuring product conformity to safety thresholds for residual free phenols.

Regulatory Compliance

Assessing potential phenol contamination risk in products used for food contact or sensitive applications.

Material Research

Chemical analysis for formulation optimization in thermosetting plastics.
Development of improved resin curing processes minimizing free phenol content.

Industrial and Laboratory Use

Routine testing in plastics manufacturing, material certification labs, and regulatory agencies.
Reference method for evaluating phenolic materials in forensic or failure analysis contexts.

Related Standards

ISO 565 - Test sieves for particle size standardization, applicable to sample preparation.

ISO/R 385 - Requirements for precision laboratory burettes used in volumetric analysis.

ISO 648 - Laboratory glassware specifications, including single-mark pipettes essential to this procedure.

ISO/TC 61 - Technical Committee on plastics responsible for developing related plastics testing standards.

Keywords: phenol-formaldehyde mouldings, free phenols determination, iodometric method, phenolic plastics testing, CEN standard, ISO 119:1977, thermosetting plastics, chemical analysis, volumetric titration, phenol content testing.

EN ISO 119:1998 PDF

Abstract

Похожие стандарты

Overview

Key Topics

Applications

Related Standards

Технические детали

ISO 119:1977

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