MSC 85/26/Add.2 ANNEX 3 RESOLUTION MSC.268(85) - US Coast ...

MSC 85/26/Add.2ANNEX 3Page 3676 Self-heating test for charcoal6.1 Apparatus6.1.1 Oven. A laboratory oven fitted with internal air circulation and capable of beingcontrolled at 140 o C + 2 o C.6.1.2 Wire mesh cube. Construct an open-top cube, 100 mm side, from phosphor bronzegauze 18.000 mesh per square centimetre (350 x 350 mesh). Insert it inside a slightly larger,well-fitting cube, made of phosphor bronze gauze 11 mesh per square centimetre (8 x 8 mesh).Fit the outer cube with a handle or hooks so that it can be suspended from above.6.1.3 Temperature measurement. A suitable system to measure and record the temperatureof the oven and in the centre of the cube. “Chromel-alumel” thermocouples, madefrom 0.27 mm diameter wire, are suitable for measuring the temperature range expected.6.2 Procedure6.2.1 Fill the cube with carbon and tap down gently, adding carbon until the cube is full.Suspend the sample in the centre of the oven which has been preheated to 140 o C + 2 o C. Insertone of the thermocouples in the centre of the sample and the other between the cube and the ovenwall. Maintain the temperature of the oven at 140 o C + 2 o C for 12 hours and record the oventemperature and the sample temperature.6.3 Results6.3.1 Non-activated carbon, non-activated charcoal, carbon black and lamp black fail the test ifthe temperature at any time during the 12 hours exceeded 200 o C.6.3.2 Activated carbon and activated charcoal fail the test if the temperature at any time duringthe 12 hours exceeded 400 o C.I:\MSC\85\26-Add-2.doc