To evaluate Fire Retardant clothing materials in order to measure the heat transferred through the fabric, two values are calculated: Arc Thermal Performance Value (ATPV)...the minimum energy causing the predicted onset of second-degree burns and Heat Attenuation Factor (HAF)...the percentage of total energy of the arc that the fabric prevents from passing through, OSHA requires that each employer must assess the potential hazards in the work environment and determine the appropriate clothing materials using ASTM PS57-97. Always do a hazard assessment. You will need to know electrical system voltage, fault current available, number of phases, Arc time duration, estimated Arc gap, minimum distance from the Arc, and Arc configuration.
Ray-Ban is a brand of sunglasses and eyeglasses founded in 1937 by American company Bausch & Lomb. Lauded by jet setters and celebrities, Ray-Ban infuses high-tech performance and iconic style into trend-transcending designs, including their Wayfarer and Aviator styles. The prototype, created in 1936 and known as 'Anti-Glare', had plastic frames and green lenses that could cut out the glare without obscuring vision. The sunglasses were remodeled with a metal frame the following year and rebranded as the Ray-Ban Aviator. In 1952, Ray-Ban created another classic style, the Ray-Ban Wayfarer.