MIL-PRF-3135H
4.5.1.2.1 Tantalum and tungsten content. The tantalum and tungsten content of the underlayment shall be
determined using any appropriate spectroscopy test method. The tests shall be conducted in accordance with the
equipment manufacturer's directions for the use of the instrument. The underlayment manufacturer is responsible
for establishing data justifying the test method choice and analytical accuracy.
4.5.1.3 Hazardous air pollutant (HAP) content. Formulation data shall be used by manufacturers in lieu of
testing to demonstrate compliance with HAP requirements of this specification. The manufacturer's formulation
data must have a consistent and quantitatively known relationship to the testing required. Calculation of individual
HAP contents can be based on either manufacturer evaluation of batches or supplier data for raw materials used in
the product. The underlayment manufacturer must provide, for each individual HAP, a formulation value that will
not be exceeded if a sample from any quality control approved production batch of the underlayment is evaluated in
accordance with this paragraph.
4.5.1.4 Volatile organic content (VOC). VOC for each batch (as described in 40 CFR 63.782) shall be
determined in accordance with 40 CFR 60 Ch.1, Appendix A, Method 24, allowing the sample to reside at 22±1 °C
(72±2 °F) for 24 hours prior to conducting the analysis. No oven heating is allowed.
4.5.2 Flash point. The flash point of each component shall be determined in accordance with ASTM D3278.
4.5.3 Weight. Three panels shall be prepared in accordance with 4.4.1. These panels shall then be weighed
and the uncovered weight of each panel recorded to the nearest 0.05 kilogram (0.01 pound). The deck covering
underlay material shall then be applied at a thickness of 6.4 millimeters (0.25 inch) (not including the plate and
primer thicknesses). When the material has fully cured at referee conditions in accordance with manufacturer's
instructions, the three test specimens shall then be weighed to the nearest 0.05 kilogram (0.01 pound). The
uncovered weight of each steel plate recorded earlier shall then be subtracted from the weight of that same plate with
the cured underlayment. These weights shall then be multiplied by a factor of four to give pounds per square foot at
a thickness of 6.4 millimeters (0.25 inch) for each panel. The results from the three test panels shall then be
averaged, and the final average pounds per square foot at a thickness of 6.4 millimeters (0.25 inch) of the material
recorded.
4.5.4 Resistance to impact. Two panels shall be prepared in accordance with 4.4.1. The underlayment system
shall then be applied to both panels at a thickness of 6.4 millimeters (0.25 inch) (not including the plate and primer
thicknesses), and allowed to fully cure at referee conditions in accordance with manufacturer's instructions.
Measurements of the thickness of the material shall be made at the geometric center of the sample and at nine other
random points, to ensure the underlayment thickness at all points is 6.4±0.7937 millimeter (0.25±0.03125 inch).
The first specimen shall be firmly mounted on a solid horizontal base. A 0.9-kilogram (2-pound) steel ball shall be
dropped vertically from a height of 2.4 meters (8 feet) onto the underlayment, such that the impact will be at the
center of the specimen. The specimen shall be subjected to two impacts of the ball. The underlay shall then be
visually examined for chipping, cracking, or delamination from the steel plate. The thickness of the underlayment at
the point of impact of both balls shall then be measured. The residual indentation shall then be measured by
calculating the difference between the thickness of the underlayment at the center of the sample before impact and
the thickness of the underlayment at the center of the sample after impact. This procedure shall then be repeated on
the second panel, and the two residual indentation results averaged and recorded.
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