Ozone materials compatibility

Prior to their current phase-out, chlorofluorocarbons (CFCs) were widely used as processing solvents for various materials. CFCs were well suited for many medical applications owing to their high solvency, nonflammability, good materials compatibility, and low toxicity. The uses for CFCs include a silicone deposition solvent, a fluoropolymer dispersion liquid, and processing solvents. However, the Montreal Protocol phase-out of ozone-depleting substances has required that alternative dispersants and solvents be found. Limitations of most available alternatives include flammability, low volatility, poor solvency, and poor materials compatibility. 

Chemical methods, where compatible, shall be used on a wider variety of constmction materials. These methods typically employ oxidizing agents such as halogenated compounds, hydrogen peroxide, ozone. 

Propane is beneficial working fluid due to its good thermodynamic properties, low cost, availability, compatibility with constructional materials, environmental friendliness. The latest circumstance is very important because of the ozone depleting by chlorfluorocarbons CFC and hydrochlorfluorocarbons HCFC. So, propane as other hydrocarbons is welcomed and used as working fluid in heat pumps for heating application in Europe [2, 3]. 

The use of EPDM rubbers for the manufacture of automobile and truck tires has not been successful, mainly because of poor tire cord adhesion and poor compatibility with most other rubbers. However, EPDM rubbers have become widely accepted as a moderately heat-resisting material with good weathering, oxygen, and ozone resistance. They find extensive use in nontire automobile applications, including body and chassis parts, car bumpers, radiator and heater hoses, weatherstrips, seals, and mats. Other applications include wire and cable insulation, appliance parts, hoses, gaskets and seals, and coated fabrics. 

Chapter 1 through Chapter 4 covers polymeric (plastic) materials, both thermoplastic and thermoset. An explanation is presented as to the t) e of corrosive effects of each polymer, its ability to withstand sun, weather, and ozone, along with compatibility tables. 

Chlorinated Polyethylene - Sold under the brand name Cloropel . a product of ILC Dover Company, tliis material has reduced flammability and increased resistance to oil, ozone, and many chemicals. It has good to excellent resistance to aliphatic liydrocarb- 2. ons, phenols, ketones, esters, acids, and is impermeable to most gases. Much of the data compiled in the compatibility was derived from ILC Dover literature. 

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