Polypropylene ( PP ) Plastics : Types, Uses, Properties, Application & Structure info h//twitter.com/SunnyRa24637740?s=0 What is Polypropylene (PP), and What is it Used For? Polypropylene (PP) is a thermoplastic “addition polymer” made from the combination of propylene monomers. It is used in a variety of applications to include packaging for consumer products, plastic parts for various industries including the automotive industry, special devices like living hinges , and textiles. Polypropylene was first polymerized in 1951 by a pair of Phillips petroleum scientists named Paul Hogan and Robert Banks and later by Italian and German scientists Natta and Rehn. It became prominent extremely fast, as commercial production began barely three years after Italian chemist, Professor Giulio Natta, first polymerized it. Natta perfected and synthesized the first polypropylene resin in Spain in 1954, and the ability of polypropylene to crystallize created a lot of excitement. ...
(01) IMMERSION TEST (ASTM D 543, ISO 175) The method of measuring the resistance of plastics to chemical reagents by simple immersion of processed plastic specimens is a standard procedure used throughout the plastics industry. The method can only be used to compare the relative resistance of various plastics to typical chemical reagents. The test results do not provide a direct indication of suitability of a particular plastic for end-use application in certain chemical environments. The limitation infl uencing the results, such as duration of immersion, temperature of the test, and concentration of reagents should be considered when studying the test data. For applications involving continuous immersion, the data obtained in short-time tests are useful only in screening out the most unsuitable materials. The test equipment consists of a precision chemical balance, micrometers, immersion containers, an oven or a constant-temperature bat...
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