Testing the Elongation at Break of Liquid Silicone Rubber
I. Sample Preparation
Sampling: Take a sample from the liquid silicone rubber product, ensuring the sample is representative.
Specimen Preparation: Use appropriate tools to cut the silicone rubber sample into standard test pieces, ensuring uniform length, width, and thickness. Typically, specimens are prepared in a dumbbell shape or other specified shapes suitable for tensile testing.
II. Testing Equipment Preparation
Tensile Testing Machine: Select a tensile testing machine that meets the required standards and set the appropriate tensile rate. The tensile rate should be chosen based on the type and properties of the silicone rubber to ensure accurate test results.
Measuring Tools: Prepare calipers or other measuring instruments to measure the initial dimensions of the sample and its dimensions after stretching.
III. Testing Procedure
Mounting the Sample: Secure the silicone rubber sample in the clamps of the tensile testing machine, ensuring firm contact to prevent slipping or detachment during the test.
Start the Test: Start the tensile testing machine to stretch the sample. Record the tensile force and elongation during the test.
Data Recording: When the sample fractures, record the maximum tensile force and the elongation of the sample. Additionally, record the sample's initial dimensions and dimensions after fracture.
IV. Data Processing
Calculate Elongation at Break: Based on the recorded elongation and the initial dimensions of the sample, calculate the elongation at break of the silicone rubber. The elongation at break is typically expressed as the percentage of the elongation at the point of fracture relative to the initial length.
Analyze Test Results: Evaluate whether the elongation at break of the silicone rubber meets the expected requirements based on the test results. If the results do not meet the requirements, further investigate the causes and implement appropriate corrective actions.