Downloaded from https://www.everyspec.com MIL-STD-2031(SH) APPENDIX C 1)11’l OF 7’1IE FI.AS1 IOVKR l)(TI’l!NTIAI. OF A LININ(; MA’1’l;ltlAL [!S1S(; A (~l,,.\ l{’l’Ll{-SC}4Ll; R()()M I~Il{E JO. SCOI>E 10,1 Scope. This method describes a procedure to determine the flashover potential of materials in a room when subjected to ii fire exposure. The method described will yield a time from (he introdudion the fire exposure until the moment of flashover. This appendix is a mandatory part of the standard. The information contained herein is intended [or compliance. 10.2 Justification.
In the interest of reducing cost and time associated with fire testing in a full size room (defined as a 10 by 10 by 8 feet high room having a 30 by 80 inch high doorway), a quarter-scale room fire test was devised to predict flashover potential of lining materials exposed to fire. 20. APPLICABLE DOCUMENTS This seetion is not applicable to this appendix. 30. EQUIPMENT 30.1 Qunrter-aeale room. The quartew-sede room shall be constructed from a suitable eeramie insulation board and shall form an airtight box having a ceiling and four sides.
The box shall be pIacd on a fioor fabricated with the same material The ineerior dimensirm of the fulty lined quarter-scale room shall be 30 by 30 by 24 inches high. The doorway is located at the center of one wall and shall be 19.5 inches wide and 17 inches high to secure the proper ventilation and fire development. The height between the finished ceiiing and the top of the doorway shall be 7 inches. The floor of the model room shall extend at least 12 inches outside of the doorway. The box shall be removable the box in contact with to allow for application of ceiling and wall covering. The entire base of the floor shall be made airtight.
A porous plate diffusion flame burner shall be used as the fire source. by 3.5 by 3 inches high, consisting of a horizontal porous plate area of 3 by 3 inches with a .25 inch wide-steel plate Perimeter and steel plate sides- and bo-ttom. 30.2 Fire source. The burner shall be 3.5 30,3 Thermocouples. Four 10 mil chromel-alumel thermocouples shall be used, 1 3 inches below the center of the overhead and 1 inch and 2 inches below the top of the inch and doorway. 40. PROCEDURE 40.1 Material. The test material shall fully line the walls and ceiling. 20