[Film Properties and Measurements] - film fog shadow determination

Film haze measurement is a method for evaluating the clarity and transparency of coating surfaces. It is mainly used to test the degree of fog shadow and astigmatism on the coating surface.

Coating film fog shadow measurement is usually tested using a transmittance test, which can measure the light intensity transmitted by the coating sample by irradiating the light source on the coating sample and placing it in a photometric instrument to calculate the transmittance of the coating. Rate and fog shadow degree. Among them, the commonly used transmittance measurement units are percentage, light transmittance, transparency, etc.

Film fog shadow measurement can be used to evaluate the clarity and transparency of various types of coated surfaces, such as automotive glass, architectural glass, electronic displays, etc. By measuring the degree of fog shadow and astigmatism on the coating surface, the transparency and quality of the coating can be evaluated, providing basic data for developing coating maintenance and improvement programs.

Fog shadow is a diffuse reflection phenomenon of high-gloss paint films due to light irradiation. The Fog Shadow Gloss Meter is a dual beam of light gloss meter, in which the participation of beam of light can eliminate the effect of temperature on gloss and color on fog shadow value. The main receiver of the instrument receives the gloss of the paint film, while the secondary receiver receives the fog shadow around the reflected gloss. The fog shadow value can reach up to 1000, but when evaluating the paint, the fog shadow value below 250 is sufficient, so the instrument test range is 0~ 250. The fog shadow value of paint products should usually be set below 20, because the fog shadow of the coating film is too large, which will seriously affect the appearance of the high-gloss paint film, especially the light-colored paint.