A so-called ceramic fiber blanket with the following external and technical characteristics: - for various industrial applications, such as thermal and acoustic insulation or refractory lining; - made of ceramic fibers; - suitable up to a maximum temperature of 1260 ° Celsius; - offered on rolls; - a thickness ranging from 6 to 50 mm; - a weight ranging from 64 to 160 kg / m3.
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[1][1]. NLBTI2018-0264#608771
“Swinging Ceramic Fiber Blankets”. The material submitted with your letter indicated that these products will be used as insulating materials in industrial furnaces, heaters, the inside walls of high temperature tubes, electrical power furnaces, nuclear power stations and other applications. They will also be used as liners in high temperature reaction equipment in the chemical industry. In addition, the blankets will be used for fire proofing and heatinsulation in tall buildings. Our laboratory has determined that each of these products consists of mineral wool.
[1] Please importantly note that only the relevant portion of the related is displayed above. You may refer to the said customs ruling for the entire ruling explanation.
[1]. https://rulings.cbp.gov/ruling/N183183