1. Test Specimens
1.1 One specimen is to be prepared
1.2 The specimen is to be a minimum of 150mm x 150mm and of the thickness which is used
on the vessels, together with any facing with which it is normally covered.
2. Conditioning of Test Specimens
2.1 The conditioning atmosphere should have a temperature of 20 ± 20°C and relative
humidity of 65 ± 2%.
2.2 The specimen should be laid flat, in the conditioning atmosphere for a period of 24
hours, or for a sufficiently longer period in order to ensure that the mass of the
specimen shows no progressive change greater than 0.25% when it is determined at
intervals of 2 hours.
3. Atmosphere for Testing
3.1 The test is to be conducted in an atmosphere the same as for conditioning the
specimen, or within 2 minutes of removal from the conditioning atmosphere.
3.2 Appropriate measures should be taken to prevent draughts in the vicinity of the
testing equipment when testing is in progress.
4. Testing Procedure
4.1 Source of Ignition
The source should be obtained by using a burner consisting of a copper tube having a
length of 150mm and inside and outside diameters of 5mm and 6mm respectively connected
by a plastic or rubber tubing to a gas tap supplying natural gas. The copper tube is to
have no opening for the supply of air.
4.2 Height of Flame
Before the test takes place the burner flame is to be adjusted to a height of 32mm.
4.3 Test Procedure
4.3.1 Place the specimen horizontally on a metal tripod stand with the upper surface of
the specimen facing downwards (i.e. with normally exposed face on underside) such that
the height of this surface of the specimen is approximately 8mm below the top of the
burner flame. Apply the burner flame at right angles to the plane of the specimen in the
centre of specimen. After one minute the burner flame is to be removed clear of the
specimen and the time in seconds to extinction of any flaming is to be recorded.
4.3.2 The test in paragraph 4.3.1 is to be repeated after any flaming or smouldering has
ceased and the temperature of the specimen has returned to normal except that the centre
of the burner flame is to be positioned at the midpoint of any edge of the specimen.
Again the time in seconds to extinction of any flaming after the removal of the burner
is to be recorded.
5 Pass Criteria
An insulation is deemed to be "not readily ignitable" when any flaming of the test
specimen ceases within 20 seconds of the removal of the burner.