In numerous fields such as industrial production, architectural decoration, and electronic manufacturing, the "bonding strength" of adhesives directly determines the quality and service life of products. One of the core indicators for measuring adhesive bonding strength is shear strength. An accurate and standardized adhesive shear strength test can not only help enterprises select the optimal adhesive solution but also avoid quality risks such as product detachment and failure from the source. Today, we will take you through the entire process of adhesive shear strength testing and reveal the professional logic behind a reliable test report.
Before Testing: Details Determine Accuracy
Sample preparation is the core: in accordance with standards such as ASTM D1002 and ISO 4587 or customer requirements, select matching substrates, clean their surfaces, and apply adhesive with precise thickness control using professional equipment to avoid stress concentration affecting the results.
After applying the adhesive, bond the two substrates according to the standard overlap area (commonly 25mm × 100mm), fix them without bubbles or deviation, and then cure them under constant temperature and humidity as required by the adhesive to ensure simulating the actual service condition.
Simultaneously calibrate the high-precision universal testing machine, match the fixture and level it to avoid additional stress, ensuring the purity of shear force measurement.
During Testing: Strictly Control Variables for Accuracy
Install the cured sample aligned with the force-bearing center of the fixture, and set the loading speed at 1-10mm/min according to the characteristics of the adhesive and substrate. Deviations in speed will affect the accuracy of the peak value.
After starting the test, the universal testing machine will apply shear force at a constant speed as set. The force sensor will collect force data in real-time and generate a force-displacement curve on the computer screen through supporting software. Throughout the test, the operator will monitor the operation status of the equipment and changes of the sample, carefully observe whether the sample has delamination, fracture, or other phenomena, and record abnormal situations during the test—whether it is substrate fracture, adhesive layer failure, or interface peeling, different failure modes can provide important basis for subsequent adhesive performance analysis.
When the sample reaches the maximum bearable shear force and fails, the equipment will automatically stop loading and record the maximum shear force value. To ensure the reliability of the test results, we will conduct at least 5 sets of parallel tests on samples of the same batch, eliminate abnormal data, and calculate the average value as the shear strength test result of the batch of adhesive. This multiple parallel test method can effectively reduce accidental errors and make the test data more representative.
After Testing: Interpret Data to See Quality
The core value of the test lies in analysis: comprehensively interpret the adhesive performance by combining the force-displacement curve, maximum shear force, and failure mode.
Cohesive failure indicates that the adhesive formula needs optimization; interfacial failure is mostly due to inadequate substrate treatment or compatibility issues; substrate fracture proves that the adhesive performance is excellent.
The report we issue includes core data, deviations, and failure modes, and also provides optimization suggestions combined with actual scenarios, serving as a quality certificate and production reference.
Why Choose Professional Testing?
Shear strength testing involves numerous details, and unprofessional operations are likely to lead to distorted data, misleading selection decisions. Professional testing requires standardized processes and technical support.
Our team has rich experience and advanced equipment, strictly abides by international and domestic standards, and can provide customized testing services for various industries such as new energy, automotive, and electronics. We accurately grasp the key points and provide authoritative results.
Quality depends on details, and reliability is determined by testing. If you have needs such as adhesive selection, performance verification, or process optimization, contact us—professional testing will escort your business!
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