Refractory Ceramic Fiber (Alumino Silicate Wool)

Abstract

Refractory ceramic fiber (RCF) belongs to the group of fibrous materials known as man‐made vitreous fibers (MMVF) or synthetic vitreous fibers (SVF). It is produced from molten mineral raw material, predominantly silica, and alumina. RCFs may be sold in the form of loose wool, blankets, boards, or vacuum‐formed shapes. Products made from RCF are generally used at application temperatures above 900°C in industrial equipment such as furnaces and kilns. Individual fibers may be released into the air during manufacture, handling, use, decommissioning, and disposal. As with other fibrous materials, inhalation and consequent effects on the lungs are considered to be the most important health concerns, and sampling airborne fiber concentration is therefore the focus of exposure assessment. RCF is classified as possibly (or presumed to be) carcinogenic to humans and is subject to various national workplace exposure limits or guidelines. Also, like other SVFs, RCF can cause acute mechanical irritation to the skin and eyes. Epidemiological studies have demonstrated no increases in all‐cause mortality or mortality from lung cancer or all cancers combined in RCF‐exposed workers; overall, it is concluded that occupational exposure to RCF is associated with the development of pleural plaques and minor decrements in lung function but not interstitial fibrosis or increased lung cancer.