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Ref. No.: ISO/ R 120 - 1959 (E)
IS0
I NT ERN AT1 ON A L
O RG A N IZ AT I O N FOR STA N DARD IZ AT1 O N
IS0 RECOMMENDATION
R 120
PLASTICS
DETERMINATION OF FREE AMMONIA AND AMMONIUM COMPOUNDS
IN PH ENOL-FORMALD EHYDE MOULD I N GS
1st E D IT1 O N
August 1959
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The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
being
by the national standards organization of that country,
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 120, Determination of Free Ammonia and Ammonium
Compounds in Phenol-Formaldehyde Mouldings, was drawn up by Technical Committee
ISOlTC 61, Plastics, the Secretariat of which is held by the American Standards Association,
Incorporated (ASA).
At its third meeting, held in Stockholm, in August 1953, the Technical Committee
assigned the development of this question to its Working Group No. 5, Physical Chemical
.
Properties, under the leadership of the United Kingdom.
The draft formulated by the Working Group was presented to the Technical Com-
mittee at its fourth plenary meeting, held at Brighton, in October 1954 and then distributed
to the members of the Technical Committee as a draft proposal for an IS0 Recommenda-
tion.
After its reconsideration at the fifth meeting of ISO/TC 61, held in Paris, in July 1955,
the draft proposal was adopted, subject to some amendments, as a Draft IS0 Recom-
mendation.
On 25 January 1957, the Draft IS0 Recommendation (No. 124) was distributed to all
the IS0 Member Bodies and was approved, subject to certain amendments, by the follow-
ing 23 (out of a total of 38) Member Bodies:
Poland
Australia *Hungary
Romania
Austria India
Spain
Belgium *Ireland
Sweden
*Canada Japan
Switzerland
Czechoslovakia Mexico
United Kingdom
Finland Netherlands
U.S.S.R.
France *New Zealand
*Greece *Yugoslavia
No Member Body opposed the approval of the Draft.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in August 1959, to accept it as an IS0 RECOMMENDATION.
* These Member Bodies stated that they had no objection to the Draft being approved.
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IS0 / R 120 - 1959 (E)
IS0 Recommendation R 120 August 1959
PLASTICS
DETERMINATION OF FREE AMMONIA AND AMMONIUM COMPOUNDS
IN PHENOLFORMALDEHYDE MOULDINGS
1. SCOPE
This method of test gives a semi-quantitative measure of the amount of ammonia in
phenol-formaldehyde mouldings by determining the ammonia content of the distillate
from a hot aqueous extract of a powdered moulding, the extract having been made
alkaline with sodium hydroxide. It is not intended as an absolute measure of the
ammonia present. The amount of ammonia in a moulded article may be of importance
when corrosion of metal inserts or contamination of foodstuffs has to be considered.
2. APPARATUS
The apparatus consists of the following:
(a) Means for reducing the mouldings to a powder,
(b) Sieve with apertures of 0.2 to 0.3 mm,*
(c) Balance to
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