Plastic advantages and disadvantages

Selection of the material model is another important factor to be considered. Some programs allow the user to specify plastic moment-rotation curves for beam elements. However, the more rigorous and most widely available method of defining nonlinear material properties is to specify the stress versus strain data, Plastic behavior is approximated at the section level in the former method whereas, the latter method tracks plastic behavior at the individual integration points (fibers) through the thickness of the member. Each method has its advantages and disadvantages. 

One solution to the problem of our overflowing landfills is to burn plastic objects instead of burying them. What would be some of the advantages and disadvantages of this practice ... 

Plastics have both advantages and disadvantages Advantages of plastics Plastics... 

Adhesives offer both advantages and disadvantages in comparison with other methods of assembly, some of the most important of which are presented in summary form at the conclusion of this chapter. (The chapter as a whole comprises an introductory section, a summary of theoretical considerations underlying the effective use of this approach, a review of the types and typical compositions of adhesives suitable for bonding plastics ( solvent-based , water-based , hot-melt , and reactive ), requirements and methods for treating the surfaces in preparation for bonding, and a number of examples of the successful use of adhesives.)... 

There was for some years debate over the advantages and disadvantages of electroless copper or nickel for plastics in decorative applications. It was said that since copper was more ductile it would give the better adhesion however, more recent improvements in etching and activation have tended to nullify any... 

Standard analyses are described in ASTM and Bureau of Mines publications, but nonstandard methods must be acquired from publications dealing with the specific area of interest. For example, the plastic properties of coal, which are important considerations in many process designs, can be characterized by various techniques, each having its own advantages and disadvantages (Table 19.4). 

Factors are discussed which need to be taken into account when evaluating and designing new biocides for use in plastics formulations. In addition to establishing compatibility with the polymer matrix, the antiniicrobial efficacy has to be tested. The selection of a suitable test method is discussed, together with advantages and disadvantages of traditional test methods. An alternative method based on a modified version of the Film Adherence Method for the evaluation of biocidal performance is presented, which is claimed to be more representative of the end use conditions. 

Some critics say that the goods provided by the CPI are not needed and should not be produced. Examples of supposedly unnecessary products are synthetic fibers (vs. cotton or wool), plastic containers, disposable diapers, artificial or synthetic coloring and flavors in foods, food preservatives, fertilizers, and insecticides. Since these products are purchased, there must be some benefit to the consumer. Does the public have such poor judgment and taste that critics need to dictate what people should do Select three CPI products and list their advantages and disadvantages to society as a whole. 

Plastics undoubtedly have an increasingly useful role to play in both the packaging and administration of pharmaceutical products. To summarise, emphasis is placed on their advantages and disadvantages together with advice on the information required to prove their general suitability. 

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