The moisture and heat resistance of the film is its ability to maintain performance and integrity in high temperature and humidity environments. This ability not only reflects the corrosion resistance of the coating, but also a key indicator of the quality and scope of application of the coating. In this paper, the moisture and heat resistance of the film and how to measure this important property are discussed in depth.

1. The importance of resistance to moisture and heat

Coatings are often challenged by a variety of environmental conditions, especially in high temperature and high humidity environments. Under such conditions, the physical and chemical properties of the film may change, causing its performance to decline. Therefore, it is essential for manufacturers, users and end users of coatings to understand their resistance to moisture and heat.

2. Materials and instruments

Special equipment and materials are needed to determine the moisture and heat resistance of the film. Temperature and humidity control box is the core equipment of this kind of measurement, usually composed of the following parts:

Solution bottles, heating tanks and humidifiers are used to create a constant temperature and humidity environment.

Temperature and humidity controller and temperature and humidity meter to ensure the accuracy of the measurement process.

Test chamber, made of metal lined with a waterproof inert material.

Pipe and test plate frame, made of anticorrosive material.

Distilled water to meet specific purity requirements.

Metal test plates, after specific pretreatment and coating.

Moisture and heat resistance of the coating film and a method for determination thereof

3. Determination method

Determining the resistance of the film to moisture and heat requires strict procedures to ensure the accuracy and repeatability of the results:

Early adjustment: Select three coated test plates and stabilize them for 16 hours at 23±2°C and 50±5% relative humidity.

Test plate suspension: Ensure that the test plates do not touch each other, and put into the pre-adjusted temperature and humidity control box. The ambient conditions are 47±1°C temperature and 96±2% humidity.

Test period: The start time of the test is when the temperature and humidity reach the set value. Check every 48 hours initially and every 72 hours thereafter. After each inspection, the test plate should be changed position.

The end of the test: according to the pre-agreed time or standard to determine.

4. Evaluation and presentation of results

The evaluation of the moisture and heat resistance of the film is mainly based on the appearance of the damage degree of the template. Observations are made in good light or under direct light, compared with samples that have not been tested. In addition, make sure that no fingerprints are left during the inspection, so as not to affect the accuracy of the results.

Moisture and heat resistance of the coating film and a method for determination thereof

Step 5 Summarize

The resistance of the film to moisture and heat is its ability to maintain its performance under specific environmental conditions. For all aspects of the coating industry, from research and development, production to application, this is a very important performance indicator. Through professional determination methods, we can ensure the quality and suitability of coating products, providing users with a more durable and reliable coating solution.