Main properties mechanical strength

Platinum-clad stainless steel laboratory ware is available for the evaporation of solutions of corrosive chemicals. These vessels have all the corrosion-resistance properties of platinum up to about 550 °C. The main features are (1) much lower cost than similar apparatus of platinum (2) the overall thickness is about four times that of similar all-platinum apparatus, thus leading to greater mechanical strength and (3) less susceptible to damage by handling with tongs, etc. 

Introduction. Today nitrocellulose is one of most important derivatives of cellulose used in industry and commerce, and a major product of the chemical industry. Its wide and manifold applications are due mainly to its extraordinary physical properties. Thus a protective coating of nitrocellulose varnish, a nitrocellulose film or a tube of smokeless powder — all are characterized by relatively high elasticity and mechanical strength. These properties are a direct consequence of the microstructure of cellulose, which is composed of highly oriented long-chain molecules of polysaccharide. Not only nitrocellulose, but also other derivatives of cellulose, such as other esters and ethers, demonstrate similar characteristics. 

The main functions of a carrier or support are usually to lend mechanical strength, increase stability to sintering and provide a larger active surface area than would otherwise be available. There is evidence that, in many instances, compound or complex formation takes place between the catalyst and the support, with a consequent effect on the catalytic properties. The most commonly used support materials are silica, alumina, silica-alumina, titania, silicon carbide, diatomaceous earths, magnesia, zinc oxide, iron oxide and activated carbon. 

The NEOSEPTA-F membrane properties examined are mainly of those relating to the electrolysis of sodium chloride solution. Table III shows characteristics of typical grades of NEOSEPTA-F, These membranes are chemically stable, i.e., against acid, base, oxidants and reductants because the membranes have perfluorocarbon backbone. And also the membranes have strong mechanical strength because of reinforcement with the fabric of polytetrafluoroethy-lene. Used in the electrolysis of sodium chloride solution, no deterioration of performance or mechanical strength was observed in continuous service for 2 years under appropriate electrolysis conditions. NEOSEPTA-F membranes are always improved to get better performance in the electrolysis and various grades which show better performance are developed. 

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