"Composed of molded parts comprising 30% glass-filled nylon, filter material made from heat-resistant plastic according to MIL-P-21105 or MIL-P-5425 specifications. The filter color is translucent white, and the legend is made from transparent, heat-resistant acrylic material meeting either MIL-P-21105 or MIL-P-5425 standards. Window material consists of high-temperature, self-extinguishing polycarbonate. Style B applies, with legend type IB, a bypass mode requiring photo-etching or engraving at 0.090 inches in height, 0.0151 inches in port, and 0.003 inches in line width within the area for legend type IB."