Overview
QZP black and white Covering power measuring board is a special test tool manufactured according to the method specified in the national standard GB1726-88, which is suitable for the determination of Coating hiding power, that is, the determination of the minimum amount of paint used to make the base color no longer appear, expressed in grams/square meter.
Features
1. Adopt 25 × 25mm ² Checkerboard graphic design, a total of 32 grids
2. Glass plate size is 100 × 250mm, thickness 1.2~ 2mm
3. undercoat with black and white nitro paint
4. Manufactured in accordance with national standards
Principle
Coating is evenly brushed on the black and white check board until the grid cannot be visually distinguished, and then the minimum amount of Coating required per unit area is calculated by weighing to determine the hiding power performance of the Coating.
Applications
Inks, Coatings hiding power measurement
Standards
GB1726-79、GB1726-88
Steps
1. Wipe the black and white check board clean
2. Hold enough Coatings to be tested in an appropriate container, weigh them together with the brush with Balance, and record the total weight W1, accurate to 0.01g.
3. Coating evenly on the black and white check board with a brush, so that the grid can no longer be distinguished visually. It is recommended to do it in the Color Assessment Cabinet
4. Weigh the remaining Coatings together with the weight W2 of the brush used
5. Calculate the hiding power X, the formula: X = (W1-W2)/S × 104-50 (W1-W2), where X is the hiding power (g/m ²), W1 is the original weight (g), W2 is the residual weight (g), S is the painting area (cm ²)
6. The arithmetic average of the two measurements shall prevail, but the difference between the two Measured values shall not be greater than 5%, otherwise the data is invalid and needs to be re-tested
Notice
• Brushing requires fast and even
• Coatings should not be painted around the grid
• When the coating to be tested is thick and unfavorable for uniform brushing, the sample can be diluted, but the amount of thinners should be deducted proportionally when calculating the hiding power
