2. Tests:
The crayons shall pass the following tests on smooth, untreated wood.
A. Color Fastness. Six to eight lines shall be drawn with a sample crayon on the face of a pice of wood. Care should be taken to maintain uniform pressure in drawing all lines. Approximately half of each of the lines shall be covered with suitable material to protect it from radiation from the arc lamp. The marked face of the wood shall be exposed for 40 hours to the radiation from a glass-enclosed carbon-arc lamp, such as the Fade-Ometer, with a current of approximately 13 amperes and 140 volts at the arc. The lamp shall be so ventilated the temperature at the face of the wood shall not exceed 41 degrees C (105 degrees F). There shall be no appreciable fading of the color of the exposed area as compared with the unexposed area.
B. Water Resistance. Markings shall be made with the sample crayon on wood that shall then be immersed in water at 21 to 24 degrees C (70 to 75 degrees F) for a period of 24 hours. There shall be no bleeding of the markings.
Note: The “color fastness” and “water resistance” tests which are described in paragraphs 2.A and 2.B shall be run for the first production lot for each color on a contract. Thereafter, a certification will be acceptable as long as the production methods, crayon formulas and quality level do not change.
C. Breaking Strength. Place one crayon perpendicular across two horizontal and parallel notched meatal supports 0.64 cm (1/4 inch) wide. The supports shall be set 6.35 cm (2-1/2 inches) apart center to center. The test load shall be applied perpendicular to the crayon surface with a 0.64 cm (1/4 inch) wide rod in a vertical direction. The test load shall be applied at the midpoint of the crayon as supported by the notched supports resting on a platform scale or any other means of accurately indicating the applied load). A base line calibration load of 1.36 kg (3 pounds) should be gradually applied. The test load shall be in minimum of 6.80 kg (15 pounds) for the soft crayon and 11.34 kg (25 pounds) for the hard crayon. Gradually apply and increase the test load up to respective minimum requirement. Maintain this load for 30 seconds. The crayon shall be of sufficient hardness to withstand the breaking strength test up to and including minimum load specified without breaking.
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