An investigation was made of the effect of organosilicon and organometallic compounds on the weather resistance of systems based on chlorosulphonated polyethylene. The effects of modification with tetrabutoxytitanium, ethyl silicate, and titanosiloxanes on the water and acid resistance, the steam permeability, and also the resistance to UV radiation and elevated temperatures were studied. Chlorosulphonated polyethylene (CSPE) is widely used as a special-purpose material for the development of acidresistant, low-flammability composites. Such properties result from the presence in the CSPE of chloride and sulphochloride groups, and also from the absence of nonsaturation in the polymer chain. Furthermore, CSPE-based coatings are noted for a number of valuable properties such as low gas and steam permeability, resistance to ozone, retention of elasticity at subzero temperatures, and compatibility with many polymers and synthetic resins, which makes it possible to vary the properties of CSPE-based composites widely [3].