After seeing water-based water-based paints for a period of time, there will be stratification. The upper quarter is water quality solution, and the lower layer is paint particles. Observe whether the water solution is colorless or yellowish, clear and clean, and less floating. The inferior coating aqueous solution is relatively turbid, and there are more floating substances.
Look at the paint particles can take a small amount of paint into the water, gently stir to observe whether the water is still clear, paint particles are uniform in size, whether in the water is relatively independent, there is no adhesion phenomenon. The poor quality coating will immediately become turbid after agitation and the particle size will differentiate.
Look at the coating film should not afford powder, and has a certain scrub resistance, with dirt can be washed with water. After the high-quality product is wiped with a damp cloth, the color of the coating film is bright as new. After the inferior product is washed several times, the coating is faded or even damaged.
The products subject to the inspection report must meet the requirements of the National Standard for Synthetic Resin Emulsion Coatings and the Standard for the Limitation of Harmful Substances in Interior Decoration Materials for Interior Wall Coatings. The inspection agency must be approved by the National Bureau of Technical Supervision and have the CMA inspection mark.