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Environmental Stress Crack Resistance Tester DW1441

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Environmental Stress Crack Resistance Tester, also named Notched constant tensile load tester, NCTL tester or GRI GM5b NCTL Tester, which is used to evaluate the stress crack resistance of polyolefin geomembranes by notched constant tensile load test.

Environmental Stress Crack Resistance Tester DW1441

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It is used to evaluate the stress crack resistance of polyolefin geomembranes by notched constant tensile load test.

Environmental Stress Crack Resistance Tester is used to use method is ASTM D5397: “Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test”, abbreviation “NCTL”.

The “NCTL” test method test the specimen with putting the specimen under the different constant tensile load, load 20%-65% of the material yield strength on the dumbbell shaped specimen. The sample should be notched before test ,the depth is the 20% of the sample thickness , then immersed it in a temperature of 50 ℃, 10% concentration  surfactant . In this accelerated aging process, measure the time of sample destruction, the results plotted as a load and destruction time diagram .NCTL provide the information of material plastic failure and brittle failure .The material resistance to stress cracking strength is the transition time of two failure modes.

Application

Application of Environmental Stress Crack Resistance Tester

Environmental Stress Crack Resistance Tester is used to evaluate the stress crack resistance of polyolefin geomembranes by notched constant tensile load test. It is mainly applicable to the geomembranes used on the landfill site. Dumbbell shaped notched test specimens from a polyolefin sheet are subjected to a constant tensile load in the present of a surface-active agent and at an elevated temperature. The time to failure of test specimens is recorded and the results of a series of such tests conducted at different stress levels are presented by plotting stress level against failure time for each stress level on a log-log axis.

There are 30 working positions which support 10 groups tests under 20%-65% yield stress

Each group calculates load quality automatically; providing timing determination method and breakage time determination method in two ways; during or after test you can check out the rupture time of each specimen under all the stress and the average rupture time so it is easy to analyze the results.

 

Environmental Stress Crack Resistance Tester complies with ASTM D5397, CJ/T 234附C etc international and retailer standards.

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Standards

Standards of Environmental Stress Crack Resistance Tester 

ASTM D5397 CJ/T 234附C

Key specification

Key specification of Environmental Stress Crack Resistance Tester

Max. load of each leverage ≤10kg
Leverage ratio 1:3
Thickness range of geomembranes to measure 0.75~3mm
Number of working position 30,
Temperature range Room temperature~70℃
Temperature control mode PID automatic control
Temperature accuracy ±1℃
Time accuracy 1s
Display mode Touch panel
Inner dimensions of chamber 1200×150×300mm (L×W×H)

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