Testing Resistoflex has the most vigorous testing of any expansion joint manufacturer in the market. All of the tests performed are to ensure only top quality product leaves our facility. The following includes a list of tests both product line tests and 100% piece tests. 100% Piece testing Roll Test - 100% of Resistoflex expansion joints are roll tested before they are molded into convoluted form. For this test, the liner is compressed to 50% of its diameter in two different planes to force hair-line cracks or other faults. Any non-conformance found is cause for rejection. Roll tests CANNOT be performed with isostatically molded expansion joints. Hydro Test - 100% of Resistoflex expansion joints are hydrostatically tested prior to shipping. This ensures the final product is free from defect before shipping to the customer. All expansion joints are hydrostatically tested at 1.5 times their ambient temperature pressure rating – any leakage is cause for rejection. Product Performance Testing Flex Life Test - One expansion joint of each size is installed at neutral length on the flex tester and is flexed at 50% of the maximum allowable compression and extension. One cycle is defined as neutral-compression-neutral-extension-neutral. This is done at a specified pressure and temperature and when finished the unit is pressurized to failure at 100°F. Units are certified to 100,000 cycles while still retaining full pressure handling capability. Static Test - The static test is the most rigorous test Resistoflex performs on the expansion joint product line. This test consists of 3 stages with one expansion joint. The procedures for this test are outlined in the chart below.   Stage 1 Stage 2 Stage 3 Test Cycle Test Sequence Time from previous change, hrs. Elapsed Time, hrs Temp. °F Pressure, psig Pressure, psig Pressure, psig 1 1 Start 0 150 1.0 x rated pressure 1.5 x rated pressure 2.0 x rated pressure 2 24 24 250 1.0 x rated pressure 1.5 x rated pressure 2.0 x rated pressure 3 24 48 350 1.0 x rated pressure 1.5 x rated pressure 2.0 x rated pressure 4 24 72 450 1.0 x rated pressure 1.5 x rated pressure 2.0 x rated pressure 5 24 96 Purge to Amb. Temp 0 0 0 Repeat above for total of 4 test cycles. Time to cool to ambient temperature is added to elapsed time for each cycle. At the end of each stage, units must not show any signs of visible deterioration, stress marks, crazing, cracks, delaminations, splits, or holes. Rated pressure is defined as the published maximum operating pressure at the test temperature for that unit. Product Performance Testing is for design qualification and not performed on each individual joint manufactured.