The development of rigid polyvinyl chloride has opened an entirely new field in structural applications. Rigid polyvinyl chloride has sufficient structural strength, impact resistance and hardness to replace metals in many forms. At the same time, polyvinyl chloride offers such inherent properties as extreme corrosion resistance, heat and electrical insulation, dimensional stability, low maintenance, ease of fabrication, light weight and good aging.
Unplasticized vinyl chloride has exceptional resistance to acids, alkalies, alcohols and aliphatic hydrocarbons. The resin is non-oxidizing, insoluble in most chemicals and self-extinguishing. The maintenance of these properties in the final product depends upon the modifiers used in specific formulations.
Recommendations are made regarding the use of rigid polyvinyl chloride in various media. Corrosives in which tests were made include three concentrations of sulfuric acid, three concentrations of hydrochloric acid, two concentrations of nitric acid, two concentrations of phosphoric acid, acetic and glacial acetic acid, fatty acids, hydrogen peroxide, sodium hypochlorite, chromic acid, two concentrations of sodium hydroxide, potassium hydroxide, water, five salts, three fats and oils and nine solvents. Mechanical properties are given for Type I and Type III polyvinyl chloride.
Fabrication of rigid polyvinyl chloride is discussed in detail. Topics considered in this connection include machining methods, molding techniques and joining techniques.
