SCOPE:-
This instrument is used for conducting test as per cl. 12.14 (Slow Burning Property) of IS: 5161-1969.

Technical Specifications:

Dimension of test enclosure: 300x400x600mm
Dimension of metal pipe: 100mm diameter,200 mm height
Distance between top of burner and lower edge of test specimen: 20mm
Range of time interval meter: 0 to 99.9x0.1 Sec

In, this test, rectangular strips of 50 mm width and about 120 mm length are cut out of the heating pad under test. These stripes are suspended vertically inside a mild steel pipe held with its axis vertical and the bottom face of the test specimen aligned with the lower face of the pipe, the top and bottom face of the pipe being left open. Flame from a Bunsen burner is applied for a period of 15 Sec to the lower edge of the test specimen and then removed.

The time of any flame or afterglow on the test specimen after the removal of igniting flame shall not be more than 2 seconds.

Instruments should have a metallic stand on which a mild steel pipe is held with its axis Vertical, a Bunsen burner mounted on movable base which can be brought below the centre of the pipe or moved away from it, a time interval meter to measure the flame application time and flaming and afterglow time, and a sheet metal draught free enclosure in which the above parts are mounted. The enclosure is in form of a rectangular box closed on top, bottom, and three sides.

The pipe is supported on a tripod, and has a viewing window along its length for observing the progress of afterglow on the test specimen. The window is covered with a transparent polycarbonate sheet. Test specimen is suspended from a flat metal strip, which can be supported in two vertical slots on the upper end of the pipe.

A Bunsen burner having a 9.5 mm diameter opening is mounted on a sliding platform on the base of the enclosure. It can be moved to a position vertically below the suspended test specimen by sliding its mounting base on two rods from outside the test enclosure. A needle valve is provided to regulate the rate of flow of gas to the burner.

 The flame application time is measured on a digital time interval meter, which starts automatically as soon as the burner is brought below the test specimen and is switched off manually as soon as flaming or after glowing of the test specimen gets extinguished. Flaming or afterglow time is determined by subtracting the flame application time from the time indicated on the time interval meter. The equipment is duly epoxy powder coated corrosion resistant finish.

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