FED-STD-228A
Method 5221.1
18 APRIL 2014
FLAMMABILITY, VERTICAL
1. SCOPE
1.1 This method is intended for use in determining the flame-resistant properties of fibrous coverings,
other than tapes, of insulated wire and cable without metallic coverings. It is also applicable to the
determination of the flame-retardant properties of plastic insulation and jackets.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit approximately 18 inches in length from which
any covering over the covering to be tested has been removed.
3. APPARATUS
3.1 The apparatus shall be as follows:
3.1.1 Test chamber approximately 12 inches wide, 14 inches deep, and 24 inches high made of metal
sheet. The chamber shall be open at the top and front and equipped with supports for holding the
specimen in a vertical position and keeping it taut during the test.
3.1.2 Supply of fuel gas, butane, or equivalent. The gas system shall be equipped with controls for
maintaining the flow of gas to the burner at a uniform pressure.
3.1.3 A steel scale graduated to 1/32 inch or finer or its decimal equivalent.
3.1.4 Watch or other timing device which will register the time in seconds.
3.1.5 A Tirrell burner having a bore of 3/8 inch and 4-inch length above the primary air inlets. The burner
shall have an attached pilot light and shall be mounted on a 20° angle block in the heating chamber.
3.1.6 An adjustable steel angle (jig) attached to the bottom of the chamber to insure the correct location
of the burner with relation to the specimen.
3.1.7 Flame indicators consisting of stripe of gummed kraft paper, 5 mils in nominal thickness and ½ inch
in width.
4. PROCEDURE
4.1 The flammability test shall be carried out in a room free from draft or under a hood in which the flow
of air is not sufficient to affect the flame. The specimen shall be free from mechanical damage.
4.2 One end of the specimen shall be fastened in the chamber by means of a clamp. The flame indicator
paper shall be attached to the specimen 10 inches above the point where the inner blue cone of the flame
is to be applied. The indicator paper shall be moistened just sufficient for proper adhesion and wrapped
once around the specimen with the gummed side toward the specimen and the ends pasted evenly
together and projected ¾ inch from the specimen on the side opposite to where the flame is to be applied.
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