5 Classification criteria
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.727 – Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions – (Adopted on 4 July 1996) - Annex - Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions - 5 Classification criteria

5 Classification criteria

  5.1 The peak radiant flux (Ew) should be measured for the first 15 min of the test, for the first 30 min of the test, and for the entire duration of the test (i.e., 60 min for class "A" and 30 min for class "B" boundaries).

  5.2 The peak radiant fluxes (Ew) measured in accordance with paragraph 5.1 should be compared against the reference value (Ec) from the table.

  5.3 If (Ew) is less than (Ec), the window is acceptable for installation in a boundary of the corresponding fire resistant classification.

Table 1. Criteria For Heat Flux
Fire Resistant Division Classification Time Period From Beginning of Test To Emissive Power Ec (kW/m2)
A-0 60 minutes 56.5
A-15 15 minutes 2.34
  60 minutes 8.0
A-30 30 minutes 2.34
  60 minutes 6.4
A-60 60 minutes 2.34
B-0 30 minutes 36.9
B-15 15 minutes 2.34
  30 minutes 4.3
Parent topic: Annex - Recommendation on Thermal Radiation Test Supplement to Fire Resistance Tests for “A”, “B” and “F” Class Divisions
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