Acceptance criteria :
- The average temperature measured on the unexposed side with thermocouples shall not exceed 139 degrees C above its initial temperature.
- Maximum temperature of any thermocouple measured on unexposed surface shall not expected 181 degrees C above its initial temperature.
- There shall be no collapse of the floor structure or part of it during the test period.
- No penetration of the floor structure that would allow hot gasses to flow through and ignite cotton waste located on the top surface of the floor or unexposed surface of the floor during 30 minutes of the test.