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IMP MSC 61 (67)

IMO RESOLUTION MSC 61(67) Fire Test Procedures, Part 2: Smoke and Toxicity test


The test principle is given in international standard ISO 5659-2, with additional measurements and criteria as stated in IMO Res. MSC 61(67). The method is applied to assess smoke production from materials for marine application, and the toxicity of the smoke fumes.

The surface of a specimen with dimensions 75 mm x 75 mm is exposed to heat radiation from above. The test specimen is placed inside a chamber, where the smoke produced from the specimen during the test is collected. Optical smoke density (Ds) is determined by measuring the attenuation of a light beam by the smoke in the chamber. When the smoke density reaches its maximum value, gas samples for measurement of toxic gas concentrations are collected. The toxic gases measured are CO (carbon monoxide), HCl (hydrogen chloride), HF (hydrogen fluoride), NOx (nitrogen oxides), HBr (hydrogen bromide), HCN (hydrogen cyanide) and SO2 (sulphur dioxide).

The tests are performed at three different test conditions:

  1. heat flux density 25 kW/m2 without pilotflame
  2. heat flux density 25 kW/m2 with pilotflame
  3. heat flux density 50 kW/m2 without a pilotflame

Three single tests are carried out at each of these test conditions. The measurements of gas concentrations are only measured once for each test condition.


The test report contains information about:

  • the tested product
  • trade name of the product
  • manufacturer and place of production
  • Averaged maximum smoke density for each of the three test conditions
  • Measured gas concentrations for each of the three test conditions
  • Product assessment

The criteria for evaluating a material as not capable of producing excessive quantities of smoke and toxic products or not to give rise to toxic hazards at elevated temperatures are given below.


The test specimens shall as far as possible comply with the material in real use. A complete test requires that at least 15 specimens are available.

Dimensions of the test specimens:

Area: 75 mm x 75 mm
Thickness: maximum 25 mm


Testing can be started when order is confirmed in writing, and the test specimens have been conditioned according to the standard. Normally it will take about 3-4 weeks from we have received the test specimens until the test report is finished.


1. Smoke

An average (Dm) of the maximums of Ds of three tests at each test condition shall be calculated.

  1. for materials used as surface of bulkheads, linings and ceilings, the Dm shall not exceed 200 in any test condition;
  2. for materials used as primary deck covering, the Dm shall not exceed 400 in any test condition;
  3. for materials used as floor covering, the Dm shall not exceed 500 in any test condition and
  4. for plastic pipes and electric cables, the Dm shall not exceed 400 in any test condition.

2. Toxicity

The gas concentrations measured at each test condition shall not exceed the following limits:

CO 1450 ppm HBr 600 ppm
HCl 600 ppm HCN 140 ppm
HF 600 ppm SO2 120 ppm
NOx 350 ppm