During the coating construction process, floor paint users generally attach great importance to inspecting various quality indicators of the finished floor coating film, yet they often overlook the quality inspection of the floor paint raw material itself. Only by strictly controlling and selecting qualified floor paint materials before construction can high-quality coating results be guaranteed.
When bulk coatings are purchased and delivered to the factory, the technical department can only conduct sampling inspection for acceptance. Although sampled testing can reflect the representative quality and performance of the batch, it cannot guarantee that 100% of the entire batch fully complies with coating specifications and all performance requirements of factory quality standards.
Therefore, enabling operators to understand and master coating quality standards closely related to construction quality, as well as factory performance indicators, testing instruments and standard inspection procedures, is highly beneficial for correct material application, floor paint quality control, and the improvement of operational skills.
For solvent-based coatings, quality standards include international standards, national standards of China, ministerial standards issued by the Ministry of Chemical Industry, and respective factory quality standards formulated by each manufacturer.
Measurable items in floor paint quality standards include fineness, viscosity, leveling property, hiding power, density, flash point and consistency. In addition, several quality items of floor paint can be inspected by visual observation before use.
The particle size of pigments and fillers in colored coatings, as well as their uniform dispersion degree during production, greatly affect the flatness, smoothness and gloss of the finished paint film. Hence, it is necessary to test the fineness indicator to ensure compliance with specified quality standards. A scraper fineness gauge is commonly used to determine coating fineness.
Coating viscosity is divided into relative viscosity, kinematic viscosity and absolute viscosity.
On construction sites, the viscosity measured by a No.4 flow cup is regarded as relative viscosity.
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