A-A-52407A
3.2.3 Specific gravity. Unless otherwise specified (see 7.3), the glass shall meet the specific gravity requirements as specified in table IV, when tested in accordance with ASTM D792.
TABLE IV. Specific gravity
|
Grade |
Specific gravity, g/cm3, + 0.004 |
|
A |
2.500 |
|
B |
2.500 |
|
C |
2.290 |
|
D |
2.300 |
3.2.4 Transmittance wave length. The glass grades A and B (sharp cut red filters) and grades C and D (blue filters) shall meet the transmittance wave length requirements specified in tables V and VI, respectively.
TABLE V. Transmittance wave length (grades A and B).
|
Grade |
Nanometers |
|||
|
1/ |
2/ |
3/ |
4/ |
|
|
A |
637-648 |
678 |
617 |
15 |
|
B |
628-637 |
667 |
608 |
15 |
1/ The wave length limits within which shall lie the wave length (the cut frequency) where the transmittance is 37 percent (%).
2/ The transmittance shall be 80% or greater from this wave length to 750 nanometers.
3/ The transmittance shall be less than 0.5% at all shorter wave lengths.
4/ The difference between the wave lengths where the transmittance is 15% and 60% is not greater than this value.
TABLE VI. Transmittance wave length (grades C and D).
|
Grade |
Nanometers |
||
|
1/ |
2/ |
3/ |
|
|
C |
555 |
49 |
T 740= T 530 ± 15 |
|
D |
514 |
40 |
T 740= T 510 ± 5 |
1/ Wave length at which transmission is 15.0 + 0.7%.
2/ The difference between the wave lengths at which the transmission is 15 % and 60% shall be equal to the specified value within a tolerance of + 5 millimicrons. This requirements is applicable in the blue portion of the spectrum.
3/ Transmittance (T) in % not corrected for surface reflection.
3.3 Identification marking. Identification markings shall be as specified in the contract or work order (see 7.3).
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