A-A-2910
4.3 Performance Testing:
4.3.1 Breaking Strength: Wax lead and mechanical pencil in accordance with this commercial item description, shall be placed in a rigid holding block set to maintain a constant angle of 45o - 50o between the pencil and the platform. The pencil shall extend beyond the underside of the block 31.75 mm to 38.10 mm (1 1/4 to 1 1/2 inches), measured along the pencil to the end of the prepared end. The scale platform shall be smooth and shall offer no resistance to the point moving across its surface. Pressure shall be applied by pushing the rod, which holds the block, down gradually and uniformly in order to avoid variations and shock. Readings shall be taken at the instant of breaking, provided the breaking point is definite. A slow, mushy deformation or crumbling shall be considered as a break with the reading to be taken as nearly as possible to the point where this type of failure begins. The breaking strength shall be based on the average of all subjected to not less than four tests. All leads being tested and all pencils being used as holding devices shall be held at a temperature of not less than 23o +1.1oC (73.5o + 2oF) relative humidity 50 + 4% for a minimum of 12 hours preceding the test.
5. Packaging: Preservation, packing and marking shall be as specified in the contract or order.
6. Notes:
6.1 Applicable Documents. Issues of the following documents in effect on the date of invitation for bids or request for proposal form a part of this document to the extent specified herein.
6.1.1 Federal Acquisition Regulation (FAR) may be obtained from the Superintendent of Documents, Government Printing Office, Washington DC 20402.
6.1.2 Application for copies of ANSI/ASQC Z1.4 can be obtained from the American Society for Quality Control, PO Box 3005, 611 E Wisconsin Avenue, Milwaukee, WI 53201-4606.
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