Test Data - Product Testing
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HDPE Adjusting Rings
Environmental Stress Cracking Analysis |
INTRODUCTION
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| We have completed the analysis of your sample "Test Bars" (Chemir/Polytech #990878) determining stress cracking in accordance with ASTM D 1693 - 97a Standard Test Method for Environmental Stress-Cracking of Ethylene Plastics. The results are summarized below: |
SAMPLE LOG-IN
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| The sample was logged as follows: |
| SAMPLE DESCRIPTION |
CHEMIR/POLYTECH SAMPLE NUMBER |
| Test Bars |
990878 |
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ANALYSIS RESULTS
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| Environmental Stress-Cracking ASTM D 1693 - 97a |
| No stress cracks were noticed after forty-eight (48) hours of exposure to the reagent lgepal CA-120 and a mild solution of sulfuric acid with a pH of 5 at 50°C. The test was allowed to continue for a total of one hundred sixty eight (168) hours. There were no stress cracks noticed on any of the twenty specimens up to 168 hours. |
ANALYSIS DISCUSSION
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| Environmental Stress-Cracking ASTM D 1693 - 97a |
| All testing and sample preparation was carried out in accordance with ASTM D 1693 - 97a. This test method covers the determination of the susceptibility of ethylene plastics to environmental stress-cracking when subjected to the conditions nerein specified. Under certain conditions of stress and in the presence of environments such as soaps, wetting agents, oils, or detergents, ethylene plastics may exhibit mechanical failure by cracking. Bent specimens of the plastic, each having a controlled imperfection on one surface, are exposed to the action of a surface-active agent. The proportion of the total number of specimens that crack in a given time is observed. Environmental stress-cracking is a property that is highly dependent upon the nature and the level of the stresses applied and on the thermal history of the spicimen. |
| Under the conditions of the test method, high local multiaxial stresses are developed through the introduction of a controlled imperfection. Environmental stress-cracking has been found to occur most readily under such conditions. The specimens were cut in accordance to specifications in section 8.2 and placed inside the specimen holder. The holder was then placed inside two test tubes, one containing lgepal CA 210 and the other containing a mild sulfuric acid solution with a pH of 5. The test tubes were then placed into a control chamber at 50°C for 48 hours. Since no stress-cracking was observed, the test continued for a total of 168 hours. No stress cracks were observed. Ten specimens were tested for each reagent. The results are summarized in the table below. |
| ASTM D 1693 - 97a Environmental Stress-Cracking |
| Identification of Material Tested |
Post consumer recycled high-density polyethylene plastic with less than 1% injection grade polyethylene and polypropylene supplied by LADTECH Inc. |
| Manner of Preparation of Test Specimens |
Injection molded test bars. |
| Reagent and Strength |
lgepal CA 210 - 100%
Mild sulfuric acid solution < 1%. With a pH of 5. |
| Condition of Test |
50.0 ± 0.5 °C. |
| Duration of Test (Hours) |
168 Hours. |
| Percentage of Specimens that Failed |
0 |
| Date of Test |
April 28, 1999. |
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| For more information about testing procedures and existing test results, contact LADTECH, Inc. at testing@ladtech.com |
