Rebound resilience elasticity tester helps quality teams evaluate how flexible materials respond after an impact. It is relevant when comparing rubber, polymers, and cellular materials whose elastic behavior can affect product consistency and material selection. Rather than relying only on visual checks or static measurements, this method records a material’s rebound response under a controlled pendulum impact.
What is rebound resilience elasticity testing?
A Rebound Resilience Elasticity Tester is designed to assess the elasticity and energy-retention behavior of flexible materials. The source material identifies rubber, EVA, PU, and PVC among the materials that may be evaluated. This type of testing can support incoming-material inspection, batch comparisons, development work, and reviews of changes associated with material aging.
For a meaningful comparison, the test conditions should be handled consistently. Specimen preparation, machine alignment, impact-head selection, calibration, and the sequence of impacts all influence whether readings can be compared within a testing program. The objective is not simply to obtain a percentage, but to create repeatable evidence for material-quality decisions.
Pendulum method used by GT-KB18
The GT-KB18 uses a pendulum impact approach. A weighted pendulum strikes a specimen held in a fixed position. The rebound height is then used to determine the resilience value as a percentage of rebound energy relative to impact energy.
This approach is intended to make the impact event controlled and observable. Because the specimen is mounted in the same test position and the pendulum is released through the instrument setup, the operator can follow a defined routine rather than estimating the response manually. The analog pointer is reset before the test sequence so the measured rebound readings begin from a known reference.
Standards referenced for resilience evaluation
The GT-KB18 source information references several standards for rebound resilience testing. DIN 53512 addresses the determination of rebound resilience for rubber vulcanizates. DIN 53573 is referenced for cellular polymeric materials, including foam elasticity. ISO 4662 is identified as a method for rubber resilience using the Lupke pendulum, while GB/T 1681 is referenced for rubber resilience testing.
Standards may define applicable materials, specimen requirements, apparatus settings, and calculation or reporting practices. Before using results for a specific compliance purpose, laboratories should confirm the exact edition and requirements that apply to their material and test plan.
Rebound resilience test procedure
1. Prepare and level the instrument
Begin by ensuring rebound resilience tester is horizontally aligned. The supplied process describes using the built-in bubble level for this step. Proper leveling supports a consistent pendulum path and provides a stable basis for subsequent readings.
Select the impact head for the specimen material. The source process refers to steel and aluminum heads, with selection based on material hardness. The chosen head should remain consistent for samples being compared under the same method.
2. Mount the specimen
Prepare the specimen according to the dimensions required by the applicable method. Place it on the test plate and secure it with the clamping lever. The sample should be positioned firmly so it does not shift when the pendulum strikes.
3. Calibrate before measurement
Fix the pendulum to the release lever and adjust its height until it lightly contacts the specimen. Reset the analog pointer to 0%. This setup step establishes the starting condition before test impacts are made.
4. Perform the impact sequence
The described process uses six consecutive strikes. The first three strikes are used to pre-condition the specimen and are not included in the reported result. This helps reduce the influence of initial surface effects. Record the rebound percentage for strikes four through six.
For the stated GB/T 1681 workflow, calculate the median of the final three readings. Using the median helps represent the central response of the recorded values without relying solely on one individual reading.
The resulting percentage expresses the relationship between rebound energy and impact energy. In practical terms, it provides a structured way to compare how materials return energy after being struck. Higher readings indicate greater rebound resilience within the conditions of the test, while lower readings indicate less energy returned by the specimen.
Using test data in quality control
Rebound resilience data can be used to compare material batches against an established internal benchmark, assess changes after aging, or support development comparisons between formulations. For each test series, record the material identification, specimen preparation details, selected impact head, relevant standard, individual readings, and the final reported value. Clear records make it easier to review results when a material response changes.
Training remains important because reliable testing depends on consistent leveling, mounting, calibration, and reading practices. With a defined routine, rebound resilience elasticity testing can provide a useful measure of flexible-material behavior under dynamic impact.
Frequently asked questions
Why are the first three strikes not reported?
They are used to pre-condition the specimen, helping limit the effect of initial surface anomalies before the final readings are recorded.
How is the final result determined in the described process?
After six strikes, the rebound percentages from strikes four through six are recorded. The median of those three values is then calculated for the stated GB/T 1681 procedure.
Which materials can be evaluated?
Rubber elasticity tester Rebound elasticity tester measure rubber, EVA, PU, PVC, and similar flexible cellular materials as applicable examples.
