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UDC 678.01 Ref. No.: lSO/ R 181 - IWI (E)
IS0
ORGAN I Z AT I O N FOR STA N DARD I Z AT I 0 N
I N T ER N AT I O N A L
IS0 RECOMMENDATION
R 181
P LAST I CS
DETERMINATION OF INCANDESCENCE RESISTANCE
OF RIG ID SELF-EXTING U ISH ING THERMOSETTING
P LAST I C S
1st EDIT I ON
February 1961
COPYRIGHT RESERVED
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
by the national standards organization of that country, being
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 18 1 , Determination of Incandescence Resistance of Rigid
Self-Extinguishing Thermosetting Plastics, was drawn up by Technical Committee ISO/TC 61 ,
Plastics, the Secretariat of which is held by the American Standards Association, In-
corporated (ASA).
Work on this matter which the Technical Committee had begun since 1954, came to
an end in 1957, with the adoption of a proposal as a Draft IS0 Recommendation.
On 8 May 1959, the Draft IS0 Recommendation (No. 215) was distributed to all the
IS0 Member Bodies and was approved, by the following Member Bodies:
India Sweden
Austria
Israel Switzerland
Belgium
Italy Turkey
Burma
Czechoslovakia Japan United Kingdom
Finland Netherlands U.S.A.
Portugal U. S. S. R.
Germany
Romania
Greew
Hungary Spain
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 February 1961, to accept it as an IS0 RECOMMENDATION.
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IS0 Recommendation R 181 February 1961
PLASTICS
DETERMINATION Op INCANDESCENCE RESISTANCE
OF RIGID SELF-EXTINGUISHING THERMOSETTING
PLASTICS
1. SCOPE
This method of test evaluates the incandescence resistance (IR) of rigid self-extinguishing
thermosetting plastics, when brought into contact with a surface at incandescence (bright-red heat),
2. APPARATUS
The apparatus consists of the following:
2.1 Test chamber. A room or enclosure, protected from air currents, but provided with
means of venting the fumes of burning specimens. A hood may be used, if its exhaust
fan is turned off during the test and allowed to run only periodically to clear the fumes
between tests.
-s-
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IS0 / R 181 - I961 (E)
2.2 Test unit. The test is to be performed with the test unit shown in the figure at page 6.
The igniting bar (4) is the igniting source of this apparatus and consists of a silicon carbide
rod * 8 mm (approximately 5/16 in) in diameter, with a usable length of about 100 mm
(approximately 4 in) and metapized contact ends.
The silicon carbide rod is mouhted in an insulated (ceramic or asbestos material) holder (3)
which is arranged to rotate atiout a horizontal axis in two bearings (2), fixed on the base
plate (1). By this means the sdicon carbide rod may be removed right away from the test
specimen, when necessary. The dimensions of the base plate are approximately
275 x 250 mm (approximately 11 x 10 in).
The igniting bar (i.e. the silicin carbide rod) should be heated to a temperature of 950 OC
(1 742 OF), by alternating current or by direct current using, respectively, a regulating
transformer or a rheostat. Use a suitable voltmeter an
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