The performance evaluation of a film is a key step in ensuring its mass and suitability. Impact strength testing is an important indicator for evaluating the ability of a film to resist instantaneous deformation and maintain integrity. This article will introduce the concept of film Impact strength, the test method, and its significance in film mass evaluation.
1. Impact of film
Film Impact strength refers to the ability of the film to resist instantaneous deformation without cracking and peeling under the action of high-speed Impact force. This performance index reflects the flexibility of the film and the bonding force to the substrate. In practical applications, the film may be subjected to external forces such as impact and collision of objects, so the impact strength of the film is very important to protect the substrate and prolong the service life of the film.
2. Impact strength of film test method
According to GB/T 1732-93, the impact strength of films can be tested by impact experiments. Impact Testers are designed to follow certain specifications, including:
Heavy hammer mass: 1000g
Groove diameter: 15 mm +/- 0.3mm
Punch into groove depth: 2mm +/- 0.1mm (needs to be corrected)
The maximum sliding height of the heavy hammer: 50cm
Impact test results are usually expressed in N ● cm. Impact Tester parameters may vary in different countries and standards. For example, the impact test defined in the ISO 6272-1993 standard uses a heavy hammer mass of 1kg and a height of 1m.
3. Post-test mass assessment
Impact experiments are completed to assess the mass of the film. Common assessment methods include:
Visual observation: Use 4x magnifying glass to observe whether the film surface appears crazing and breakage. However, extremely fine crazing may be difficult to observe and judge by this method.
Film wetting observation: In some cases, after the film is wetting in CuSO aqueous solution for a period of time, observe whether copper or rust color appears to determine whether there is fine crazing.
4. Impact of film
Film Impact strength testing is important in film mass evaluation. High Impact strength means that the film maintains integrity under external Impact, preventing crazing and peeling, thereby extending the life of the film. In addition, Impact strength is also related to the flexibility of the film and the bonding force to the substrate, which is critical for the performance stability and Reliability of the film under various environment conditions.
Summarize
Film Impact strength is a key performance indicator for evaluating the resistance of films to deformation and integrity retention under high-speed Impact forces. Impact strength testing evaluates the instantaneous deformation and bonding force of films by simulating the impact under actual use conditions. Testing and evaluating the impact strength of films helps ensure that the film mass meets the expected standards, thereby protecting the substrate and extending the life of the film.
