EN ISO 120:1998 PDF

Name: EN ISO 120:1998 — Plastics - Phenol-formaldehyde mouldings - Determination of free ammonia and ammonium compounds - Colorimetric comparison method (ISO 120:1977)
SKU: EN ISO 120:1998
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Plastics - Phenol-formaldehyde mouldings - Determination of free ammonia and ammonium compounds - Colorimetric comparison method (ISO 120:1977)

Название (английский):

EN ISO 120:1998

Plastics - Phenol-formaldehyde mouldings - Determination of free ammonia and ammonium compounds - Colorimetric comparison method (ISO 120:1977)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 4
Дата публикации:: 22 июля 1998 г.
Издание:: CEN EN 120 edition 1 version 1
ICS:: 83.080.10

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Описание (английский):

Specification of a semi-quantitative method. The content of free ammonia in a moulded article is of importance, when corrosion of metal inserts or contamination in contact with the article has to be considered. Distillation of the aqueous extract from a powdered test portion, coloration of the distillate by reaction with Nessler reagent and comparison of the colour with that of standard matching solutions.

Abstract

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Overview

EN ISO 120:1998 is an international standard developed by CEN and ISO focusing on the semi-quantitative determination of free ammonia and ammonium compounds in phenol-formaldehyde mouldings. This standard specifies a colorimetric comparison method based on the reaction of ammonia with Nessler reagent. The procedure involves hot aqueous extraction, distillation, and visual comparison of the resulting color to standard matching solutions.

The measurement of free ammonia content in phenol-formaldehyde moulded plastics is critical for applications where corrosion of metal inserts or contamination of food-contact materials might occur. By providing a reliable test method, this standard assists manufacturers and quality control laboratories in maintaining product safety and performance.

Key Topics

Scope: Semi-quantitative colorimetric method for detecting free ammonia in phenol-formaldehyde mouldings.

Test Principle:

Extraction of ammonia from powdered sample with hot water.
Distillation of the extract in the presence of oxidizing and alkaline agents.
Color development with Nessler reagent.
Visual comparison against standard ammonia solutions.

Sample Preparation: Grinding or milling the moulding to a fine powder passing through a 250 μm sieve.

Reagents Used:

Potassium permanganate as oxidizing agent.
Sodium hydroxide solution for alkalinity.
Nessler reagent for colorimetric detection.
Ammonia-free distilled water to avoid contamination.

Apparatus Required: Laboratory glassware, distillation setup, balances, pipettes, filter funnel, and Nessler cylinders.

Calculation: The amount of ammonia is expressed as a percentage by mass using a formula incorporating the color comparison results and dilution factors.

Result Expression: Semi-quantitative results are presented based on color matching with prepared standard solutions ranging from 0.01 mg to 0.06 mg ammonia.

Applications

Quality Control in Plastic Manufacturing: Ensures phenol-formaldehyde mouldings meet safety criteria by monitoring residual free ammonia.

Corrosion Prevention: Identifies articles containing ammonia levels that could compromise metal components embedded within mouldings.

Food Industry Safety: Assesses risk of ammonia contamination from packaging or contact materials, ensuring compliance with hygiene standards.

Research and Development: Supports formulation improvements and new product development by analyzing the chemical stability of thermoset plastics.

Regulatory Compliance: Assists manufacturers in fulfilling regulatory requirements for chemical content in thermoset resin products.

Related Standards

ISO 565: Specifications for test sieves used in sample preparation.

ISO 648: Laboratory glassware standards, especially for pipettes employed in the quantitative analyses.

ISO/TC 61: Technical committee responsible for plastics standards, under which EN ISO 120 falls.

Other standards addressing ammonia content measurement in plastics or related materials may complement EN ISO 120 for broader analytical coverage.

By adhering to EN ISO 120:1998, professionals in the plastics and chemical testing fields can perform consistent and reliable assessments of free ammonia levels in phenol-formaldehyde mouldings, enabling safer product design and usage. The method’s straightforward colorimetric approach makes it accessible to standard analytical laboratories with minimal specialized equipment.

EN ISO 120:1998 PDF

Abstract

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Overview

Key Topics

Applications

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