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6 <br />1 0 0 <br />TECHNICAL SPECIFICATIONS <br />USING NSS 37E EPDXY/FRP TANK LININGS <br />ANNEX C <br />TESTS FOR DETERMINING COATING CURE <br />1 <br />NSS 37E EPDXY/FRP TA9K,LINING cure is determined by the use <br />of the following: <br />Barcol Hardness Tester GYZJ 935 (Barber Coleman Company, <br />Rockford, Illinois), or equal; "This method leaves a void in the <br />liner and the tested area must be recoated to eliminate the <br />void." <br />The design of the Impressor is such that operating <br />experience is not essential. It is only necessary to exert a <br />light pressure against the instrument to drive the spring loaded <br />indenter into the material to be tested. The instrument can be <br />used in any position provided that it is perpendicular to the <br />surface. The hardness reading is instantly indicated on the dial <br />which is conveniently divided into one hundred graduations. No <br />waiting, preloading or separate measurements are needed. <br />0 The barcol hardness on NSS 37E should be 65-75 when cured. <br />E <br />