MIL-DTL-43511D
vertical distance of 1-inch above or below point "C". The resultant gradient shall be smooth and
uniform when tested as specified in 4.3.5.
3.5.5 Optical distortion of critical areas. The optical distortion within the critical vision areas
shall conform to the acceptable standards shown on figure 2 when tested as specified in 4.3.5.
3.5.6 Haze. The haze value of the visor shall not exceed 2.0 percent when tested as specified in
4.3.5.
3.5.7 Ultraviolet transmittance. The erythemal ultraviolet transmittance shall not be more than
1.00 percent, when computed as the average spectral transmittance at wavelengths of 290, 300,
310, and 320 nm when tested as specified in 4.3.5.
3.5.8 Neutrality of class 2 and 3 visors. The spectral transmittance (see 6.6) of the class 2 visor
may vary with wavelengths between 430 and 730 nm, the average percentage deviation within
nine spectral bands shall be less than 12 when tested as specified in 4.3.5. The spectral
distribution curve shall show a reasonable even distribution throughout the visible spectrum to
insure that color distortion will not be excessive. The neutrality of the class 3 visor shall
conform to the requirements specified for the class 2 visor except that the average percentage
deviation shall be less than 20 when tested as specified in 4.3.5.
3.5.9 Chromaticity of class 2 and 3 visors. The chromaticity coordinates x and y of the classes 2
and 3 visors shall be within the limits indicated on figure 3 when computed as described in 4.3.5.
3.5.10 Ballistic resistance. The ballistic resistance of the lenses shall be such that they will pass
a V0 test using a 0.22 caliber, 17.0 + 0.5 grain, T37 shaped projectile at a velocity of 550 to 560
feet per second when tested as specified in 4.3.5.
3.5.11 Abrasion resistant coating . After being subjected to the abrasion tests specified in 4.3.5 ,
the increase in haze shall not exceed 2 percent and the decrease in transmittance shall not exceed
2 percent.
3.5.12 Bayer abrasion resistance. After being subject to the Bayer abrasion test the Bayer ratio
shall exceed a value of 4.0 or higher as specified in 4.3.5.
3.5.13 Coating adhesion. Before and after humidity exposure, the visor shall show no loss of
coating when tested in accordance with 4.3.5.
3.5.14 Weathering resistance. The coated visors shall show no yellowing or other changes, nor
show loss of coating when tested as specified in 4.3.5.
3.5.15 Chemical resistance. When tested in accordance with 4.3.5 the visor shall not increase
more than 2% for transmittance and haze.
3.6 Workmanship. The visors shall be free from all defects which would affect proper
functioning in service. The visors shall conform to the quality and grade of product established
by this specification.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. First article inspection (see 4.2)
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