I. Performance indicators
1. Substrate material: Different substrate materials make the tape show different performance and characteristics in various application scenarios.
2. Appearance inspection: mainly check whether there are defects such as bubbles, scratches, stains, wrinkles, deformation, uneven color, etc. on the surface of the tape.
3. Chemical resistance: The ability of the tape to maintain its bonding performance after being exposed to chemicals such as acids, alkalis, and salts.
4. Solvent resistance: The ability of the tape to maintain its performance under the action of solvents.
5. Water resistance: The ability of the tape to maintain its performance under the action of water or moisture.
6. Flame retardancy: The property of the tape to resist combustion or slow down the combustion rate when encountering a fire source.
7. Durability: The ability of the tape to maintain its performance for a long time.
8. Weather resistance: The ability of the tape to resist climatic conditions such as sunlight, heat and cold, wind, rain, and salt spray.
9. Bonding strength: The stress required to cause damage to the interface between the tape and the adherend or its vicinity.
11. Shear strength: The maximum stress that the tape can withstand when subjected to a shear force perpendicular to its plane.
12. Tensile shear strength: The shear stress per unit bonding surface of the tape when a tensile force is applied parallel to its bonding surface and in the direction of the main axis of the specimen. This indicator is one of the important parameters for evaluating the performance of the tape and is usually used to test the strength and durability of the tape during the bonding process.
13. Tensile strength: The maximum stress that the tape can withstand during the stretching process, usually expressed in megapascals (MPa) or kilograms of force (kgf/mm²).
14 Peel strength: The load that the unit width can withstand when the tape is separated from the adherend under the specified peeling conditions.
15. Elongation: The elongation of the tape refers to the percentage of the elongation that the tape can withstand during the stretching process to the initial length. Elongation is an important parameter for measuring the toughness and elasticity of the material, usually expressed as a percentage (%).
16. UV resistance: The tape is exposed to ultraviolet rays and its changes in viscosity, flexibility and color are observed.
17. Electrical properties: Dielectric strength, resistivity and breakdown voltage of the tape.
‌
II. Performance test of the tape
1. Physical properties test
(1) Tensile strength: According to GB/T 7759.2-2015 standard, cut a certain length of sample, the length of the sample is usually 200 mm, and the width of the sample is 25 mm. Test no less than 3-5 strips, take the arithmetic mean and observe the failure characteristics.
(2) Elongation at break: According to GB/T 7759.2-2015 standard,
(3) Unwinding strength: According to ASTM D1000 standard, the load required to be applied per unit width when the roll adhesive tape is unwound under certain conditions reflects the difficulty of unwinding the tape.
2. Adhesion performance test
(1) Initial adhesion test: According to GB/T 4853-2002 standard, the rolling ball method and other standard methods are used to test the adhesion of the tape at the moment of contact with the adherend.
(2) Adhesion retention test: According to GB/T 4851 standard test, the tape is pasted on the test board, and a certain weight is hung under constant temperature and humidity conditions. After a period of time, observe whether the tape will fall off. The adhesion retention reflects the ability of the tape to maintain its adhesion after a long period of adhesion.
(3) Peel strength test: According to GB/T 2792-2014 standard test, a unit width of adhesive tape is peeled off from a specific adhesive surface at a certain angle (180° or 90°) and rate, and the required force is measured.
3. Weather resistance test (test standard ASTM D1000)
(1) Heat resistance test: Place the tape in a high temperature environment (such as different temperature gradients), keep it for a certain period of time, and observe the changes in the performance of the tape.
(2) Cold resistance test: Place the tape in a low temperature environment (such as different low temperature conditions), and after a period of time, check the adhesiveness, flexibility and other properties of the tape.
(3) Humidity resistance test: Place the tape in a humid environment and observe the changes in its viscosity, structure and performance.
(4) Weather resistance test: simulate the long-term exposure of the tape to the natural environment (such as sun, rain, wind, etc.), and observe the performance changes of the tape.
4. Chemical compatibility test
(1) For some special use environments, test the corrosion resistance of the tape to chemicals such as acids, alkalis, and salts.
5. Special performance test
(1) Flame retardancy test: according to the UL94 test standard, place the tape in the flame and observe its burning speed and the residue after burning.
A vertical burning test: fix the tape on the test frame and hang it vertically. Use a standard flame to ignite the tape, usually for 10 seconds, and observe and record the burning time, burning distance, whether it self-extinguishes, and other parameters of the tape.
B horizontal burning test: lay the tape flat on the test platform and ignite it with a standard flame, usually for 30 seconds. Observe and record the burning time, burning distance, whether it self-extinguishes, and other parameters of the tape.
(2) UV resistance test: expose the tape to ultraviolet rays and observe the changes in its viscosity, flexibility, and color.
(3) Electrical performance test: measure the dielectric strength, resistivity and breakdown voltage of the tape.
6. Appearance quality inspection
(1) Color: measure according to GB/T 7703.1-2008.
(2) Transparency: measure according to GB/T 2410-2008.
(3) Thickness: measure according to GB/T 6672-2001.
(4) Length: measure according to GB/T 4850-2002.
(5) Width: measure according to production standards and user-required specifications.
(6) Roll length measurement: check whether the actual roll length of the tape is consistent with the nominal value.
(7) Appearance inspection: mainly check whether there are defects such as bubbles, scratches, stains, wrinkles, deformation, uneven color, etc. on the surface of the tape.
Different types and uses of tapes require different inspection methods. By understanding these methods, we can determine the most suitable test method for our tape type and purpose in order to accurately evaluate its durability and extend its service life as much as possible. At the same time, in the process of industrial application, we should also follow the manufacturer’s recommended methods and properly maintain and care for the tape in use to ensure its optimal performance.