Fluoroelastomers are more expensive than neoprene or nitrile rubber elastomers. THF readily dissolves latex and is typically handled with nitrile or neoprene rubber gloves. A wetsuit provides thermal insulation by layers of foam neoprene but the diver gets wet. Neoprene gloves shield radiation from polonium better than natural rubber. They began using aluminum tubing and replaced the lace with neoprene and nylon decking. He also created a tuxedo jacket made of the synthetic rubber Neoprene. Older slides are yellow and made of neoprene/nylon fabric. In rubber manufacture, salt is used to make buna, neoprene and white rubber types. Acrylic, neoprene, and nitrile-based sealants actively corrode copper. The foamed neoprene of the suit thermally insulates the wearer. Inflatable dinghies can be made of fabrics coated with Hypalon, neoprene or PVC. PVC, neoprene, and polyethylene are the most common insulators. Single lined neoprene is more flexible than double lined. The foils were made of maraging steel coated in neoprene to prevent corrosion. Ethylene thioureas are an excellent accelerant of vulcanization of neoprene and polychloroprene rubbers.