The humidity resistance of a film is its ability to maintain performance and integrity in high temperature and high humidity environments. This capability not only reflects the corrosion resistance of the film, but is also a key measure of Coating mass and scope. This article will delve into the humidity resistance of films and how to measure this important performance.
1. The importance of moisture and heat resistance
Films are often challenged by a variety of environmental conditions, especially in high temperature, high humidity environments. Under such conditions, the physical and chemical properties of films may change, resulting in reduced performance. Therefore, it is critical for manufacturers, users and end users of coatings to understand their humidity resistance.
2. Materials and instruments
Measuring the humidity resistance of films requires specialized equipment and materials. Conditioning boxes are the core equipment for this type of measurement and usually consist of the following parts:
Solution bottles, heating tanks and humidifiers for creating a constant Humidity environment.
Humidity controller and temperature Humidity meter ensure the accuracy of the measurement process.
The Test Chamber is made of metal lined with waterproof inert material.
Pipes and test plate racks, made of anti-corrosion material.
Distillation water to meet specific purity requirements.
Metal panels, after specific pretreatment and painting.
3. Determination method
Measuring the humidity resistance of the film needs to be carried out in strict steps to ensure the accuracy and repeatability of the results:
Pre-adjustment: Select three well-painted panels and stabilize for 16 hours at 23 +/- 2 ℃ and relative humidity 50 +/- 5%.
Test Board Suspension: Make sure that the test boards do not contact each other and are placed in a pre-adjusted Conditioning box. The set environmental conditions are 47 +/- 1 ℃ and 96 +/- 2% Humidity.
Test Period: The start time of the test is when the temperature and Humidity reach the set values. Check every 48 hours initially, and then every 72 hours. After each inspection, the test plate should change position.
End of trial: Determined according to a pre-agreed time or standard.
4. Evaluation and presentation of results
The humidity resistance of the film is evaluated mainly based on the degree of damage to the Appearance of the sample. Observe under good rays of light or direct light and compare with untested samples. In addition, make sure that no fingerprints are left during the inspection process, so as not to affect the accuracy of the results.
5. Summary
The humidity resistance of film is its ability to maintain performance under specific environment conditions. This is a very important performance indicator for all aspects of the Coating industry, from R & D, production to application. Through professional measurement methods, we can ensure the mass and applicability of film products, providing users with more durable and reliable painting solutions.
