Importance of Dry Film Coating Thickness Inspection [Dry Film Thickness Gauge]
Too thick or too thin dry film coating will affect the assembly and abrasion resistance of components. Therefore, a dry film thickness gauge is needed to detect the coating thickness after construction.
The importance of dry film coating thickness
The dry film thickness of the protective paint coating is very important for anticorrosive coating, and its importance is reflected in the following two aspects:
1. Functional aspects
The thickness of the anticorrosive coating greatly affects the durability of the coating.
2. Economic aspects
The thickness of the coating affects the amount of paint used and thus the cost of painting.
Therefore, all parties involved in anti-corrosion coating projects should not over-emphasize the dry film thickness of the coating. However, the positions and attitudes of the parties on this issue differ. The owner and the supervisor representing the owner ’s interests want strict control, sometimes even exceeding the requirements of the technical specifications; the double-packed coating contractor wants to be wide, to reduce the amount of paint and avoid repainting; It is expected to consume more paint strictly and sometimes to show that the paint solids are sufficient and cost-effective. Therefore, controversy about dry film thickness often occurs, especially when the specifications in the technical specifications are ambiguous.
Measurement of dry film thickness
In general, dry film thickness measurement requires the use of a dry film thickness gauge. The dry film thickness gauge is an instrument for measuring the dry film thickness on metal or non-metal substrates. After obtaining the thickness, it can be compared with the standard thickness generally recognized by the measured object.
Some dry film thickness gauges only show measured values. Other models can store hundreds of data and can send the data to a computer for analysis. Dry film thickness is important in the coatings industry because it is a decisive factor for the quality, reliability and life of coating products.
Many types of dry film thickness gauges can measure the thickness of a dry film as long as a suitable measurement method is used. According to the specifications of the Protective Coatings Association (SSPC), ASTM International, or the International Organization for Standardization (ISO), destructive or nondestructive measurements can be used for dry film thickness measurement. Dry film thickness gauges have always been an important tool to ensure that the coating thickness is within the acceptable range. Modern technology has helped dry film thickness gauge manufacturers to produce smaller, more versatile dry film thickness gauges. These features make measurements easier, faster, and more accurate.
Each measurement method has different types of dry film thickness gauges-nondestructive magnetic induction measurement, ultrasonic measurement, eddy current measurement. Micrometers and paint gauges (PIG) are two instruments that use destructive thickness measurement methods. Consider environmental conditions such as extreme temperatures, as changes in temperature can affect the readings of the dry film thickness gauge instrument. There are also a few dry film thickness gauges in the development process, reducing the impact of the external environment on the instrument measurement. For example, Linshang LS221 dry film thickness gauge, with temperature compensation function, can be used at minus 20 ° for a long time. Ensure measurement accuracy at different temperatures.
In addition, the Linshang dry film thickness gauges mainly include LS220, LS220B, LS221, LS223, and so on. These dry film thickness gauges mainly use magnetic thickness measurement and eddy current thickness measurement. It is suitable for the measurement of non-magnetic dry films on ferromagnetic metal substrates such as steel. It is also suitable for the measurement of non-conductive coatings and anodized layers on non-magnetic metal substrates. The measurement accuracy of the instrument is ≤ ± (3% of reading + 2μm). Meet the national "Determination of paint and varnish film thickness" ISO 2808: 2007, the national standard of IDT.
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