SIST EN ISO 172:2000

• Abstract:

  Specification of a qualitative method of detecting the presence of free ammonia or other volatile bases in phenol-formaldehyde mouldings by the exposure of an indicator paper to the vapour from a moistened powdered sample. It may be used when the absence of free ammonia is a requirement.

• Status: Published
• Publication Date: 30-Apr-2000
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: IPMA - Polimer materials and products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2000
• Due Date: 01-May-2000
• Completion Date: 01-May-2000
• Ref Project: EN ISO 172:1998 - Plastics - Phenol-formaldehyde mouldings - Detection of free ammonia (ISO 172:1978)

• Replaces: SIST ISO 172:1996 - Plastics -- Phenol-formaldehyde mouldings -- Detection of free ammonia
• Effective Date: 01-May-2000

SIST EN ISO 172:2000 is a Slovene standard published by SIST and identified as identical to EN ISO 172:1998. It specifies a qualitative test for detecting free ammonia or other volatile bases in phenol-formaldehyde mouldings by exposing indicator paper to vapour from a moistened powdered sample. Engineers, laboratory staff, quality managers and buyers can use it when a specification requires the absence of free ammonia.

What does SIST EN ISO 172:2000 specify?

SIST EN ISO 172:2000 specifies a simple presence/absence test for alkaline vapours released from phenol-formaldehyde mouldings. The method is intended for cases where the absence of free ammonia is a requirement, so it is used as a screening or acceptance test rather than a quantitative measurement.

The document is organized into clauses covering scope and field of application, principle, apparatus, preparation of the test sample, procedure, expression of results, and test report. The structure takes the reader from sample preparation through to the wording of the final report.

What are the key requirements of SIST EN ISO 172:2000?

SIST EN ISO 172:2000 is a qualitative method, so the result is reported as present or absent, not as a measured concentration. In practice, this means the test is suitable when a contract or product specification only asks whether free ammonia or other volatile bases can be detected.

Sample preparation and handling

Clause 4 requires a fully representative sample of the moulding to be reduced to powder by filing, milling, grinding, turning or drilling. The sample must be tested without delay, and undue heating during preparation must be avoided. This matters because heating or delay can change the amount of volatile material reaching the indicator paper.

Apparatus and test set-up

Clause 3 calls for means of reducing the mouldings to powder, a balance accurate to 0.01 g, a 50 ml glass-stoppered flask, and universal indicator test paper with a pH range of 1.0 to 11.0. In practice, this gives a small sealed test environment where alkaline vapours can be seen quickly on the indicator paper.

Procedure

Clause 5 requires about 1 g of the powdered test portion to be placed in the flask and closed quickly. A strip of moistened universal indicator paper is positioned between the stopper and the flask so that the end of the paper projects into the flask, while avoiding contact with the test portion. After 30 min, the colour of the paper is examined. This set-up lets the vapour act on the paper without direct contamination from the powder.

Interpretation of the result

Clause 6 states that if the indicator paper does not change colour, the moulding is reported as not containing free ammonia or other volatile bases. If the paper changes colour, the moulding is reported as containing free ammonia or other volatile bases. In practice, the method shows whether an alkaline vapour is present, which is the key question when ammonia contamination is a concern.

Test report

Clause 7 requires the report to include the reference to the standard, full identification of the sample, the method used to reduce the moulding to powder, and the presence or absence of free ammonia or other volatile bases. This gives a traceable record that can be filed with receiving inspection, quality control or supplier documentation.

What terms does SIST EN ISO 172:2000 define?

SIST EN ISO 172:2000 uses a small set of practical terms rather than formal definitions.

• Phenol-formaldehyde mouldings - moulded plastic parts made from phenol-formaldehyde materials, the products the test is applied to.
• Free ammonia - ammonia that can be released from the moulding and detected by the indicator paper.
• Other volatile bases - other alkaline substances that can give the same kind of indicator response.
• Test portion - the small weighed amount of powdered sample used in the flask.
• Universal indicator paper - pH indicator paper used to show whether the vapour in the flask is alkaline.
• Representative sample - material taken so that it reflects the moulding being assessed.

Who uses SIST EN ISO 172:2000?

SIST EN ISO 172:2000 is used by plastics laboratories, production quality control, and receiving inspection teams working with phenol-formaldehyde mouldings. It is also relevant to buyers and specifiers who need an objective check that free ammonia is absent. The method is a practical fit for manufacturers and users of thermosetting plastics where odour, residue or chemical cleanliness is being controlled.

What changed in SIST EN ISO 172:2000 from the previous edition?

SIST EN ISO 172:2000 is identified as identical to EN ISO 172:1998. The underlying ISO text, ISO 172:1978, is the first edition and the foreword states that it replaced ISO Recommendation R 172-1961.

What does the SIST EN ISO 172:2000 document contain?

SIST EN ISO 172:2000 contains a short laboratory method built around a sealed-flask indicator test. The content covers sample powdering, a 1 g test portion, the use of distilled-water-moistened universal indicator paper, and a 30 minute observation period. It also gives the result wording to use and the minimum items that must appear in the test report.

The document is designed for routine testing, specification checks and quality records rather than advanced analysis. Its practical value is that it turns a requirement such as "no free ammonia" into a simple, repeatable check that can be reported consistently.

SLOVENSKI STANDARD
01-maj-2000
Polimerni materiali - Fenol-formaldehidni oblikovanci - Ugotavljanje prisotnosti
prostega amoniaka (ISO 172:1978)
Plastics - Phenol-formaldehyde mouldings - Detection of free ammonia (ISO 172:1978)
Kunststoffe - Phenoplast-Formteile - Nachweis von freiem Ammoniak (ISO 172:1978)
Plastiques - Pieces moulées a base de phénoplastes - Recherche de la présence
d'ammoniac libre (ISO 172:1978)
Ta slovenski standard je istoveten z: EN ISO 172:1998
ICS:
83.080.10 Duromeri Thermosetting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

IONAL STANDARD
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME)I(LIYHAPOAHAR OPt-AHM3AiJMR l-l0 CTAH~APTM3A~WWORGANISATION INTERNATIONALE DE NORMALISATION
Plastics - Phenol-formaldehyde mouldings - Detection of
free ammonia
Recherche de Ia prtisence d ’ammoniac libre
Plastiques - Pikes moukes 2 base de ph6noplastes -
First edition - 1978-08-15
Ref. No. ISO 172-1978 (E)
UDC 678.632 ’32 ’21 : 678.067 : 543.813
Descriptors : plastics, castings, phenoplasts, detection, ammonia (gas).
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FOREWQRD
ISO (the International Organization for Standardization) is a worldwide federation
of national Standards institutes (ISO member bodies). The work of developing
International Standards is carried out through ISO technical committees. Every
member body interested in a subject for which a technical committee Dias been set
up 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.
Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the ISO Council.
International Standard ISO 172 was developed by Technical Committee
ISO/TC 6 1, Plastics.
lt was submitted directly to the ISO Council, in accordance with clause 6.13.1
of the Directives for the technical work of ISO. lt cancels and replaces
ISO Recommendation R 172-1961, which had been approved by the member
bodies of the following countries :
Australia I
...