In the pipe connection system, the combination of clamps and rubber joints is the key to ensure the sealing and stability of the system. Although the rubber joint is small, it plays a vital role in it. Recently, the DINSEN quality inspection team conducted a series of professional tests on the performance of two rubber joints in the application of clamps, compare their differences in hardness, tensile strength, elongation at break, hardness change and ozone test etc, so as to better serve customer needs and provide customized solutions.
As a common accessory for connecting pipes, clamps mainly rely on rubber joints to achieve sealing functions. When the clamp is tightened, the rubber joint is squeezed to fill the gap in the pipe connection and prevent fluid leakage. At the same time, the rubber joint can also buffer the stress caused by temperature changes, mechanical vibrations and other factors in the pipe, protect the pipe interface from damage, and extend the service life of the entire pipe system. The performance of rubber joints with different performances in the clamps is very different, which directly affects the operation effect of the pipe system.
Two representative rubber joints of DS were selected for this experiment, namely, rubber joint DS-06-1 and rubber joint DS-EN681.
Experimental equipment tools:
1. Shore hardness tester: used to accurately measure the initial hardness of the rubber ring and the hardness change after various experimental conditions, with an accuracy of ±1 Shore A.
2. Universal material testing machine: can simulate different tensile conditions, accurately measure the tensile strength and elongation at break of the rubber ring, and the measurement error is controlled within a very small range.
3. Ozone aging test chamber: can accurately control environmental parameters such as ozone concentration, temperature and humidity, and is used to test the aging performance of the rubber ring in an ozone environment.
4. Vernier caliper, micrometer: used to accurately measure the size of the rubber ring and provide basic data for subsequent performance calculations.
Experimental Sample Preparation
Several samples were randomly selected from the batches of rubber rings DS-06-1 and DS-EN681. Each sample was visually inspected to ensure that there were no defects such as bubbles and cracks. Before the experiment, the samples were placed in a standard environment (temperature 23℃±2℃, relative humidity 50%±5%) for 24 hours to stabilize their performance.
Comparative experiment and results
Hardness Test
Initial hardness: Use a Shore hardness tester to measure 3 times at different parts of the rubber ring DS-06-1 and the rubber ring DS-EN681, and take the average value. The initial hardness of the rubber ring DS-06-1 is 75 Shore A, and the initial hardness of the rubber ring DS-EN681 is 68 Shore A. This shows that the rubber ring DS-06-1 is relatively hard in the initial state, while the rubber ring DS-EN681 is more flexible.
Hardness change test: Some samples were placed in high temperature (80℃) and low temperature (-20℃) environments for 48 hours, and then the hardness was measured again. The hardness of the rubber ring DS-06-1 dropped to 72 Shore A after high temperature, and the hardness rose to 78 Shore A after low temperature; the hardness of the rubber ring DS-EN681 dropped to 65 Shore A after high temperature, and the hardness rose to 72 Shore A after low temperature. It can be seen that the hardness of both rubber rings changes with temperature, but the hardness change of rubber ring DS-EN681 is relatively large.
Tensile Strength and Elongation at Break Test
1. Make the rubber ring sample into a standard dumbbell shape and use a universal material testing machine to perform a tensile test at a speed of 50mm/min. Record the maximum tensile force and elongation when the sample breaks.
2. After multiple tests, the average value is taken. The tensile strength of the rubber ring DS-06-1 is 20MPa and the elongation at break is 450%; the tensile strength of the rubber ring DS-EN681 is 15MPa and the elongation at break is 550%. This shows that the rubber ring DS-06-1 has higher tensile strength and can withstand greater tensile force, while the rubber ring DS-EN681 has a higher elongation at break and can produce greater deformation without breaking during the stretching process.
Ozone Experiment
Put the samples of the rubber ring DS-06-1 and the rubber ring DS-EN681 in an ozone aging test chamber, and the ozone concentration is set to 50pphm, the temperature is 40℃, the humidity is 65%, and the duration is 168 hours. After the experiment, the surface changes of the samples were observed and the performance changes were measured.
1. Slight cracks appeared on the surface of the rubber ring DS-06-1, the hardness dropped to 70 Shore A, the tensile strength dropped to 18MPa, and the elongation at break dropped to 400%.
1. The surface cracks of the rubber ring DS-EN681 were more obvious, the hardness dropped to 62 Shore A, the tensile strength dropped to 12MPa, and the elongation at break dropped to 480%. The results show that the aging resistance of the rubber ring DS-06-1 in the ozone environment is better than that of the rubber ring B.
Customer Case Demand Analysis
1. High-pressure and high-temperature pipeline systems: This type of customer has extremely high requirements for the sealing performance and high-temperature resistance of the rubber ring. The rubber ring needs to maintain good hardness and tensile strength under high temperature and high pressure to prevent leakage.
2. Pipes in outdoor and humid environments: Customers are concerned about the weather resistance and ozone aging resistance of the rubber ring to ensure long-term reliability.
3. Pipes with frequent vibration or displacement: The rubber ring is required to have high elongation at break and good flexibility to adapt to the dynamic changes of the pipeline.
Customized solution suggestions
1. For high-pressure and high-temperature pipeline systems: Rubber ring A is recommended. Its high initial hardness and tensile strength, as well as relatively small hardness changes in high temperature environments, can effectively meet the high-pressure sealing requirements. At the same time, the formula of the rubber ring DS-06-1 can be optimized, and high-temperature resistant additives can be added to further improve its performance stability at high temperatures.
2. For pipes in outdoor and humid environments: Although the ozone resistance of the rubber ring DS-06-1 is good, its protection ability can be further enhanced through special surface treatment processes, such as coating with anti-ozone coating. For customers who are more sensitive to cost and have slightly lower performance requirements, the formula of the rubber ring DS-EN681 can be improved to increase the content of anti-ozonants to improve its ozone aging resistance.
3. Facing pipes with frequent vibration or displacement: the rubber ring DS-EN681 is more suitable for such scenarios due to its high elongation at break. To further improve its performance, a special vulcanization process can be used to improve the internal structure of the rubber ring and enhance its flexibility and fatigue resistance. At the same time, during installation, it is recommended to use a buffer pad to work with the rubber ring to better absorb the vibration energy of the pipeline.
Through this comprehensive rubber ring comparison experiment and customized solution analysis, we can clearly see the differences in performance of different rubber rings, and how to provide targeted solutions based on the specific needs of customers. I hope that these contents can provide valuable references for professionals engaged in pipeline system design, installation and maintenance, and help everyone create a more reliable and efficient pipeline connection system.
If you are interested, please contact DINSEN
Post time: Apr-10-2025
