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  1.1.         Airflow direction test and visualization The purpose of this test is to confirm either the airflow direction or airflow pattern or both in regard to the design and performance specifications. If required, spatial characteristics of airflow in the installation may also be confirmed. Procedures for this test are given in ISO- 14644 . 1.1.1.   Testing schedule for optional tests In addition to the normative tests specified in  ISO- 14644  , optional tests, such as those listed in Table A.1, may be included within the testing plan. Table 1 : Schedule of optional tests   Test parameter Class Suggested maximum time interval Test procedure Airflow visualization All classes 24 months ISO 14644-3:—, clause B.7 1.1.2.   Principle The purpose of airflow direction test and visualization is to confirm that the airflow direction and its uniformity conform to the design and performance sp

  Purpose: The objective of the test is determination of shelf life by using accelerated aging test method according to ASTM 1980 and ISO 11607. Materials: Test Sample, Room or Cabinet, Control Apparatus, Hygrometer, Thermometer Test Method: 1.        Select the Rate Reaction Coefficient (Q10) value.  2.        The desired shelf life(Retention Time (RT)) of the test sample it can be 1, 2 upto 5 years depend on the sample. 3.        Define aging test time intervals, including time zero using the following equations:   AAF = Q 10 [(T AA -T RT )/10]   Where:   T AA ≡ accelerated aging temperature ( ° C), and T RT ≡ ambient temperature ( ° C).   AAF= 2 [55-25/10] AAF= 8 Accelerated Aging Time (AAT) = Desired (RT)/AAF AAT   = 45 Days   4.        Test conditions, room temperature (T RT ). TRT = 25 ° C, 5.        Accelerated aging temperature (T AA )= 55 ° C 6.        The test duration is calculated using the Q 10 , T RT , and T AA . Time required for