HORIZONTAL BURNING APPARATUS FOR THERMAL INSULATION AS PER IS 11239 PART 12

Horizontal burning characteristics under the action of a small flame as measured by this test procedure are affected by such factors as density and anisotropy of the cellular material and the thickness of the specimen than 150 mm x 50 mm x 13 mm ( nominal ) of cellular plastics and cellular rubber materials when subjected to a smaller flame.

Test Chamber -

1. A test chamber shall be used, constructed of asbestos insulating board, having inside dimensions of 600 ± 5 mm length, 300 ± 5 mm width and 760 ± 5 mm height.
2. To allow easy access between tests, the chamber may be designed so that the front panel containing the window is removable, but if so constructed then provision shall be made for ensuring that a draught-proof seal is obtained when the panel is in position. The chamber shall be used in a fume cupboard.
3. The air in the chamber shall be draught-free, yet permit normal thermal circulation of air past the specimen during the burning.

Fuel Supply -

1. LPG or Natural gas of at least 93 percent purity supplied through pressure regulating valve.

Burner -

1. A Bunsen burner shall be used.

Wing Top -

1. A wing top having an opening of internal length 48 mm and internal width 3.0 ± 0.2 .mm length to be fitted to the burner.

Specimen Support Gauze -

1. The support shall be 215 mm long, 75 mm wide and shall have 13 mm of its length bent to form a rights angle. it shall consist of 6.4 mm mesh gauze constructed from 0.8 mm diameter steel wire. (A minimum of four supports shall be available.)

Gauze Holder -

1. The gauze holder Shall be constructed from mild steel .
2. a) the gauze is maintained with its long axis horizontal to within 1 degree, and parallel to the 600 mm dimension of the test chamber.
3. b) the nearest end of the specimen is 13 ± 1 mm above the burner wing top
4. c) the space both above and below the specimen is unobstructed
5. d) a means is provided for clamping the burner in the correct position relative to the specimen
6. e) the gauze is equidistant from front and back, and from the sides of the test chamber and is 175 f 25 mm above the base of the test chamber.

Timing Device - digital stop watch

Measuring Scale - scale of 0-300 mm