Manufacturing and testing of HDPE geomembrane products should be the latest version and revised in accordance with the following standards or equivalent and compared to a higher standard, if not in China, please examine according to the origin of the inspection standard.
Tensile test of geomembrane
Sample Preparation: Cut representative specimens, usually rectangular in shape, from the geomembrane. According to specific standards or requirements, determine the size and quantity of samples.
Test equipment preparation: Prepare the tensile testing machine to ensure that it is in a suitable working state, such as the setting of parameters such as loading range and speed.
Install the sample: clamp the geomembrane sample on the tensile testing machine, pay attention to keep the sample in the horizontal direction, and avoid initial strain.
Set the stretching speed: Set the stretching speed according to the corresponding standards or requirements. Common stretching speeds include constant rate stretching and constant strain stretching.
Conduct tensile test: start the tensile testing machine, start to apply tensile force, and make the sample gradually receive tensile force. Record load and displacement data during tension.
Record the results: According to the test curve, obtain the load-displacement data of each stage, including the elastic stage, the yield stage and the fracture stage.
Data analysis and evaluation: According to the test results, calculate and evaluate the tensile performance indicators of the geomembrane, such as tensile strength, elongation at break, modulus, etc.
Tear test of geomembrane
Sample Preparation: Cut representative specimens, usually rectangular in shape, from the geomembrane. According to specific standards or requirements, determine the size and quantity of samples.
Test equipment preparation: prepare a test machine or tear strength instrument suitable for tear test.
Install the sample: clamp the geomembrane sample on the tear test equipment, pay attention to keep the sample in the horizontal direction, and keep the edges of the sample in a state of mutual tension.
Set test parameters: Set the relevant parameters of the tear test, such as loading speed, test mode (one-way tear or two-way tear), etc., according to the adopted standards or requirements.
Perform the tear test: activate the test equipment and apply tensile force to tear the specimen. Record the change of tearing force during the test, and ensure the stability and accuracy of the test.
Record the results: According to the test data, calculate the tear strength index of the geomembrane, such as tear strength, tear elongation, etc. Record key data and observations during the test.
Data analysis and evaluation: According to the test results, analyze the tear resistance of the geomembrane, and compare and evaluate it with the standards or requirements.
Exposure test of hdpe geomembrane liners
Sample Preparation: A representative sample is cut from the geomembrane, usually in a rectangular or circular shape. Determine the size and quantity of samples according to specific requirements.
Test equipment preparation: choose a suitable test site to ensure that the test samples can be exposed to the real natural environment. Prepare a stand or other fixture to hold the sample.
Install the sample: Fix the geomembrane sample on the test equipment or the fixture on the test site, and pay attention to the actual application method and exposure conditions of the sample (such as contact with soil, exposure to sunlight, etc.).
Record the initial state: record the initial state of the sample, including color, appearance, size and other information. According to the needs, some initial performance parameters, such as strength, elongation, etc., can also be measured.
Exposure process: Expose geomembrane samples to the natural environment for continuous observation and recording. Environmental factors such as daily meteorological conditions, sunlight exposure time, and rainfall can be recorded, as well as changes and performance indicators of the sample surface.
Regular evaluation: Regular evaluation of geomembrane samples, including observing changes in the surface of the sample, checking changes in sample performance, etc. According to needs, samples can be taken for laboratory analysis, such as testing strength, puncture performance, etc.
Test end and analysis: According to the test cycle or specific requirements, determine the timing of the end of the test, and analyze the performance changes of the geomembrane sample during the exposure process. Compare the data before and after the test to evaluate the durability of the geomembrane.
Water vapor test of geomembrane
Sample Preparation: A representative sample is cut from the geomembrane, usually in a rectangular or circular shape. Determine the size and quantity of samples according to specific requirements.
Test equipment preparation: Prepare water vapor barrier equipment and test devices. These include water vapor transmission devices, moisture impermeable membranes (for comparison) and associated measuring instruments.
Install the sample: put the geomembrane sample into the test device, ensure the airtight connection with other parts, and pay attention to avoid damage or deformation of the sample.
Water Vapor Transmission: A water vapor pressure differential is established in the test setup so that water vapor is transported from one side through the geomembrane sample to the other. Control the temperature and humidity in the air chamber to simulate actual application conditions.
Measurement and recording: Use corresponding measuring instruments (such as water vapor resistance meter) to detect the rate of water vapor passing through the geomembrane. Periodically record measurements and calculate water vapor permeability or other metrics as required.
Test end and analysis: According to the requirements and period of the test, determine the timing of the end of the test, and analyze and compare the test results. Evaluate the water vapor barrier properties of geomembranes.
