Polyvinyl chloride, commonly abbreviated PVC, is the third most widely produced plastic, after polyethylene and polypropylene. PVC is widely used in construction because it is durable, cheap, and easily worked. It can be made softer and more flexible by the addition of plasticizers, the most widely used being phthalates. In this form, it is used in clothing and upholstery, electrical cable insulation, inflatable products and many applications in which it replaces rubber. It's considered safe and stable for technlogy applications at room-temperature but is really dangerous if burns at high temperatures and in suitable establishments because of the existance of chlorine in the molecule, liberatable as hcl with the possibility of producing dioxin or for realising of the monomer. Its use is widespread in several areas becouse of its characteristic of persistency and resistance.