Sunny Raj@

(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 resis￾tance 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 dura￾tion 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...