Difference between compression and rebound test of silicone butt pads
Compression test and rebound test are two key evaluation indicators when evaluating the performance of silicone butt pads. Although both test methods are used to evaluate the performance of silicone materials, they focus on different aspects and interpret the test results. This article will detail the difference between compression test and rebound test of silicone butt pads and explore their importance in practical applications.
I. Compression test
1. Definition
Compression test is used to evaluate the deformation and rebound performance of silicone products under stress. The elastic properties and deformation recovery ability of the product are obtained by measuring the deformation after applying a certain pressure. This test can provide key data to help manufacturers understand the performance of the product in actual use.
2. Test method
Compression test usually adopts the following steps:
Prepare samples: Cut silicone butt pads into standard size samples.
Apply pressure: Use a compression tester to apply a certain pressure to the sample, usually 25% of the sample thickness.
Measure deformation: After applying pressure, measure the deformation of the sample and record the data.
Maintain pressure: Maintain pressure for a period of time (usually 24 hours) to evaluate the performance of the material under long-term pressure.
Release pressure: After releasing the pressure, measure the recovery of the sample and calculate the compression set.
3. Importance
The results of the compression test can provide the following information:
Compression set: Indicates the degree of deformation that the material cannot recover after long-term pressure. Low compression set means that the material can still maintain good shape recovery after long-term use, thereby extending its service life.
Compressive strength: Indicates the strength of the material when it is under pressure, how much pressure it can withstand without breaking. This is very important for evaluating the durability of silicone butt pads during use.
II. Rebound test
1. Definition
The rebound test is used to evaluate the recovery ability of silicone products after being subjected to force. Resilience refers to the ability of a material to return to its original shape or state after being subjected to an external force. This performance is usually related to the physical properties of the material such as elastic modulus, yield strength and fracture toughness.
2. Test method
The rebound test usually adopts the following steps:
Prepare the sample: Cut the silicone butt pad into standard size samples.
Apply pressure: Use a rebound tester to apply a certain amount of pressure to the sample, usually 25% of the sample thickness.
Measure rebound: After releasing the pressure, measure the rebound height of the sample or the change in force after rebound.
Calculate rebound rate: Calculate the rebound rate based on the measured data. The higher the rebound rate, the better the elasticity of the material, and the faster it can recover to its original shape after deformation.
3. Importance
The results of the rebound test can provide the following information:
Rebound rate: Indicates the material’s ability to recover after being stressed. A high rebound rate means that the material can quickly recover to its original shape after being stressed, reducing permanent deformation and improving comfort.
Energy recovery: The rebound test can also evaluate the energy recovery of the material after being stressed, which is very important for evaluating the performance of the material in high-frequency vibration or high elasticity requirements.
III. The difference between compression test and rebound test
1. Test purpose
Compression test: Mainly evaluates the degree of deformation of the material when it is stressed and the ability to recover from deformation after long-term compression. The focus is on the compression permanent deformation rate and compressive strength of the material.
Rebound test: Mainly evaluates the ability of the material to recover after being stressed. The focus is on the rebound rate and energy recovery of the material.
2. Test method
Compression test: Usually a static compression test is used. After applying a certain pressure and maintaining it for a period of time, the deformation and recovery are measured.
Rebound test: Static compression test or dynamic compression test can be used to measure the rebound height of the material after force or the change in force value after rebound.
3. Evaluation indicators
Compression test: Compression permanent deformation rate and compressive strength are the main evaluation indicators. Low compression permanent deformation rate and high compressive strength indicate that the material can still maintain good shape recovery ability after long-term use.
Rebound test: Rebound rate and energy recovery are the main evaluation indicators. High rebound rate and good energy recovery indicate that the material can quickly return to its original shape after force, reducing permanent deformation.
4. Practical application
Compression test: It is suitable for evaluating the durability and shape retention of silicone butt pads in long-term use. For example, it is used to evaluate whether the pad will be permanently deformed after being compressed for a long time, affecting the comfort of use.
Rebound test: It is suitable for evaluating the comfort and elasticity of silicone butt pads during use. For example, evaluate whether the pad can quickly return to its original shape after being stressed to reduce the user’s discomfort.
IV. Practical application cases
1. Compression test of silicone butt pads
When evaluating the compression performance of silicone butt pads, you can refer to the following standards and methods:
Standard: ASTM D395 and ISO 815 are commonly used compression test standards. These standards specify the method of measuring the compression permanent deformation rate after 72 hours at a compression rate of 25%.
Method: Cut the silicone butt pad into standard size samples, apply a 25% compression force, keep it for 24 hours, and then measure the deformation and recovery. Low compression permanent deformation (such as 5% – 10%) indicates that the material can still maintain good shape recovery after long-term use.
2. Rebound test of silicone butt pads
When evaluating the rebound performance of silicone butt pads, you can refer to the following standards and methods:
Standard: ASTM D2632 is a commonly used rebound test standard. This standard specifies the method of measuring the energy recovery of materials after being stressed.
Method: Cut the silicone butt pad into standard size samples, apply 25% compression force, and measure the rebound height or force change after rebound after releasing the pressure. A high rebound rate (such as 60% – 80%) indicates that the material can quickly return to its original shape after being stressed, reducing permanent deformation.
V. Conclusion
Compression test and rebound test of silicone butt pad are important means to evaluate its performance. Compression test mainly evaluates the degree of deformation of the material under stress and the ability to recover from deformation after long-term compression, while rebound test mainly evaluates the ability of the material to recover after being stressed. Through these two tests, we can fully understand the performance of silicone butt pads in actual use and ensure that they maintain good shape and comfort during long-term use.
Post time: Jan-15-2025