a. Stability. Changes in linear dimensions shall not exceed 0.00001 inch per inch
(0.00001mm per mm) per degree Fahrenheit (.6 degree Celsius) when the material, conditioned at 80 degrees Fahrenheit (26.7 degrees Celsius), is exposed to 220 degrees Fahrenheit (104 degrees Celsius) for one hour and returned to the original condition temperature. Changes in linear
dimensions shall not exceed 0.00001 inch per inch (0.00001mm per mm) per percent relative humidity when the material, conditioned at 10% relative humidity, is exposed to 98% relative humidity for twenty four hours and returned to the original conditioning relative humidity.
b. Allowable tolerance. The thermal and hygroscopic coefficients of linear expansion shall be such that the allowable overall tolerance between check points at extremities of the sheet (length or width direction) shall not exceed +0.015 inch (in 144 inches) or +0.38mm (in 3650mm) when exposed to a 7 degree Fahrenheit or 3.8 degree Celsius rise or drop in temperature, or a 7% rise or drop in relative humidity under normal room conditions. Reproducibles shall be marked in the right-hand corner, adjacent to or above the title block, per
the example shown in figure 1, and the atmospheric conditions shall be recorded at the time of reproduction.