Indian core oil, since 1967, manufactures various types of refactory cloth filters. Being a part of that refractory cloth filters are designed to extract dross, slag, refractory particles, and nonmetallic inclusions from molten metals. Ametek haveg division usa developed rcf & we are the sole distributors for india. It was developed as a low-cost, high-efficiency alternative to cellular ceramic and ceramic foam filtration systems. Refactory cloth filters [rcf] are available in rigid or soft versions. Rcf are available in several mesh sizes, and can be cut to any geo- metric shape or size. Rcf is also available in 20 mts. Long rolls. Rcf are especially effective in removing fluid slags, such as manganese silicates, from molten metal.