A-A-2756 Marker, Tube Type, Fine Tip (For Overhead Projection Transparencies)This Commercial Item Description covers tube type, fine tip markers for use in freehand marking, writing, and drawing on visual-aid transparencies.

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4.2.2 End item inspection/testing may be used by the offerer or the Government representative, as a means to determine the effectiveness of the in process quality controls. While in process controls shall not be substituted for end item performance testing they be used in determining visual and dimensional criteria.

4.2.3 For those characteristics for which there are no such controls, or for end item performance test, lot by lot sampling for inspection/ test shall be required. The sample unit shall be one marker. Sampling shall be in accordance with the American National Standards institute (ANSI)/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 testing shall be S-3 with an AQL of 4.0 percent defective. The inspection level for performance characteristics testing shall be S-1 with an AQL of 6.5 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.

4.3 Performance Characteristic Tests: Unless otherwise specified, the tests shall be conducted in an atmosphere of 21^oC ± 3^oC (64.5^oF – 75.2^oF) and at a relative humidity of 50% ± 5% from the horizontal. Transparencies used in tests shall be of film material having a high polish finish, with a nominal thickness of .13 mm (.005 inch). The projector used shall be equipped with a six hundred (600) watt quartz bromide or equal. Test paper shall be in accordance with A-A-2804A, type III white bond paper having a pH of 5.0 and a basis weight of 60 grams per square meter (7.6 kg. 17 x 22 – 500). A tolerance of 5% is allowable. Alternately, paper conforming to JCP-O-60 can be used as an alternate source.

4.3.1 Drying Time & Fill. Place a transparency sheet smooth, flat surface and partially cover with a sheet of paper. Write a five-letter word on the exposed portion of the transparency, allow to dry 15 seconds. And immediately draw the paper and weight across the writing at a rate of approximately 101.6 mm (4 inches) per second. Neither the writing nor the paper drawn across the transparency shall show evidence of smearing or smudging. The markers reservoir shall be weighed with ink and then when empty. The fill shall weigh between 1.5 – 2 grams of ink to comply with the minimum write out distance.

4.3.2 Projectability. Write or print 4-5 words with marker on a transparency in conformance with commercial item description A-A-2958. Place the transparency on a projector as outlined in paragraph five (5) prepared and project the words on a white screen approximately 2.5 mm (8.2 ft) away. The projected markings on the screen shall be sharp and clear when observed from a distance 6 m (19.5 – 20 ft) and shall be of the same color identified as the markings on the transparency.