A-A-2778
4.2.3 For those characteristics for which there we no such
controls, or for end item performance test lot by lot sampling for inspection
shall be required. The sample unit shall be one pencil. Sampling shall be in
accordance with the American National Standards Institute (ANSI)/American Society
for Quality Control (ASQC) Z1.4, Sampling Procedures and Tables for Inspection
by Attributes.
4.2.4 An inspection lot shall consist of all like items submitted for
inspection at one time. The inspection level for visual and dimensional shall
be S-3 with an AQL of 4.0 percent defective. The inspection level for
performance testing shall be S-1 with an AQL of 4.0 percent defective. The
supplier must provide objective evidence (tests and inspection records) that
the presented material meets the requirements of the sampling plan as indicated
above.
5. Performance Tests: Unless otherwise specified, the tests shall be
conducted in an atmosphere of 21O ± 3O C (64.5O
– 75.2OF) and a relative humidity of 50% ± 5%. Tests involving
writing, shall be conducted with the markers held at an angle approximately 55O
± 5O from the horizontal and with a writing pressure so that
the markings are clearly visible. The write-out speed shall be set at 11 feet
per minute, the marker capped (nib down) and allowed a 15 minute rest after
each 9144 cm (300 feet) segment. The initial point load shall be 100 grams and
increased after each cycle. The write-out test shall continue until the marker
has reached the minimum write-out distance. Test paper shall be in accordance
with A-A-2804A, type III white bond paper having a pH of 5.0 with a basis
weight of 60 grams per square meter (16 pound, 17 x 22 – 500). A tolerance of
5% is allowable. Paper for the Machine Writing Test shall have an
additional requirement of 160-140 seconds’ maximum smoothness on both sides
using the Sheffield method per the most current TAPPI T538 test method.
Alternately, paper conforming to JCP-O-60 can be used as an alternate source.
5.1 Drying Time. Place a sheet of paper on a smooth, flat surface and
partially cover with a second sheet of paper. Place a 200 gram weight,
approximately 31.75 mm 91.25 inches) in diameter, on top of the second sheet.
Write a five-letter word on the exposed portion of the bottom sheet, allow to
dry five seconds. Immediately draw the top sheet and the weight across the
writing at a rate of approximately 101.6 mm (4.0 inches) per second. The
writing shall not smear or smudge.
5.2 Startability. Write a five-letter word with an unused sample marker.
Then place marker on its side with cap off for 30 minutes. Immediately draw the
marker nib across a sheet of paper at a rate of 101.6 mm (4.0 inches) per
second, increments of 203.32 mm (8 inches) until a solid, continuous mark of at
least 0.38 mm (0.015 inches) width is attained. Then place marker horizontally
with cap off for an additional 15 hours and recap for 30 minutes. Remove the
cap and draw the marker nib across the paper as described above and examine.
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