(a) Test cabinet.

A test cabinet similar to that shown in Figure IV shall be used.

(b) Support frame.

A support frame conforming to Figure II shall be used. It shall be constructed of ⅛ inch steel.

(c) Hold-down plate.

A hold-down plate conforming to Figure III shall be used. It shall be constructed of ⅛ inch steel.

(d) Spacers and clamps.

A spacer and clamping arrangement shall be used which is capable of positioning the hold-down plate with its bottom surface one inch above the top surface of the support frame, so that it holds the test specimen at a one-inch thickness on the two sides and the back.

(e) Thread.

#50 white mercerized cotton thread.

(f) Tape.

Tape for fastening the thread to the frame.

Note:

Alternate methods of accomplishing this, such as small clips, may also be used.

(g) Weights.

Weights for attachment to the timing threads.

Note:

Small clamp-type paper clips work well as weights.

(h) Burner.

A Bunsen burner with a tube of ⅜ inch inside diameter shall be used. The gas adjusting valve is set to provide a flame, with the tube vertical, 1½ inches in height. The air inlet to the burner is closed.

(i) Gas.

The gas used shall be Matheson Manufactured Gas Type B or equivalent.

(j) Stop watch.

A stop watch or other timing device shall be used capable of measuring the burning time to 0.2 second.