FED-STD-791D
6. PROCEDURE
6.1 Cut at least ten 5.1-cm (2-in) lengths of pipe cleaner.
6.2 Assemble a test setup (Figure 1) as follows:
a.
Mount a 5.1-cm (2-in) piece of pipe cleaner in the arm of the oscillating device
so that the end of the pipe cleaner describes an arc of approximately 120° at a
radius of 10.2 0.31 cm (4 1/8 in).
b.
Adjust the Bunsen burner to provide a completely blue flame approximately 10
cm (4 in) high, and without a sharp inner cone.
c.
Position the Bunsen burner so that the center of the 5.1-cm (2-in) piece of pipe
cleaner will pass through the center of the flame at the reversing point of the
cycle.
6.3 Pour approximately 30 mL of the sample into the petri dish, and soak five 5.1-cm (2-
in) pieces of pipe cleaner in the sample for two min.
6.4 Drain off excess sample from one of the pieces of pipe cleaner, and mount cleaner in
test apparatus as described in paragraph 6.2. Start the oscillating device, and record the number
of cycles necessary for a self-sustained flame to appear on the pipe cleaner. Repeat this
procedure with four other pieces of pipe cleaner.
6.5 Store the uncovered petri dish containing the sample in the oven, for the specified
time.
6.6 At the end of this time, remove the dish from the oven. Place five 5.1-cm (2-in)
pieces of pipe cleaner in the dish.
6.7 Recheck flammability as specified in 6.4.
7. CALCULATIONS
7.1 This section is not applicable to the test procedure.
8. REPORTING
8.1 Report the average number of cycles necessary for a self-sustaining flame to be
achieved on the pipe cleaner both before and after partial evaporation.
9. PRECISION
9.1 Precision data have not been developed for this method.
Method prepared by:
Navy - NADC 1986
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