12. REPORT

12.1 The report shall include the following:

12.1.1 Description of the attic floor insulation.

12.1.2 Description of the procedure used to prepare the floor insulation specimen.

12.1.3 Number of specimens tested, including critical radiant flux and density for each specimen as tested.

12.1.4 Observations of the burning characteristics of the specimen, such as discoloration, charring, smoldering, etc.

APPENDIX A-PROCEDURE FOR CALIBRATION OF RADIATION INSTRUMENTATION

A1. RADIATION PYROMETER

A1.1 Calibrate the radiation pyrometer by means of a conventional black body enclosure placed within a furnace and maintained at uniform temperatures of 490, 500, and 510 °C (914, 932, 950 °F). The black body enclosure may consist of a closed chromel metal cylinder with a small sight hole in one end. Sight the radiation pyrometer upon the opposite end of the cylinder where a thermocouple indicates the black body temperature. Place the thermocouple within a drilled hole and in good thermal contact with the black body. When the black body enclosure has reached the appropriate temperature equilibrium, read the output of the radiation pyrometer. Repeat for each temperature.

A2. TOTAL HEAT FLUX METER

A2.1 The total flux meter shall be calibrated by the National Bureau of Standards', or alternatively, its calibration shall be developed by transfer calibration methods with an NBS calibrated flux meter. This latter calibration shall make use of the radiant panel tester as the heat source. Measurements shall be made at each of the nine dummy specimen positions and the mean value of these results shall constitute the final calibration.

A2.2 It is recommended that each laboratory maintain a dedicated calibrated reference flux meter again which one or more working flux meters can be compared as needed. The working flux meters should be calibrated according to the procedure of A2.1 at least once per year.

1 Direct requests for such calibration services to the: Optical Radiation Section, 232.04, National Bureau of Standards, Washington, D.C. 20234.