A-A-52407 Glass, Filter, ColoredThis CID covers the physical properties of four related grades of colored filter glass for use in optical systems. The colored filter glass is referred to herein as "glass".

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A-A-52407A

TABLE I. Control thickness.

3.1.2 Inclusions. The allowable maximum and minimum size inclusions shall be 0.50 millimeter (mm) and 0.10 mm, respectively. The permissible number of maximum size inclusions shall be one per cubic centimeter (cm³) of glass. The sum of the diameter of all inclusions larger than the minimum size per cm³ of glass shall not exceed the diameter of the allowable size. Inclusions smaller than the minimum size shall be disregarded.

3.2 Physical properties.

3.2.1 Coefficient of expansion. Unless otherwise specified in the contract (see 7.3), the glass shall meet the coefficient of expansion requirements specified in table II throughout the range of 0 to 300 degrees Celsius (°C), when tested in accordance with ASTM E228.

TABLE II. Coefficient of expansion.

3.2.2 Temperature. Unless otherwise specified in the contract (see 7.3), the glass shall meet the maximum annealing and strain points temperatures and the minimum softening point temperature requirements specified in table III, when tested in accordance with ASTM C336 and ASTM C338, respectively.

TABLE III. Temperature properties.