Overview
Leneta Form 1A Opacity Chart is a black-and-white sealed cardboard designed for measurement coatings and inks hiding power. The cardboard is designed to be black sealed, medium white sealed, and lower white unsealed. The size is 140 x 254 mm, each box is 250 sheets, which meets ASTM international standards.
Features
1. Specially designed for hiding power measurement, it adopts a three-stage structure of upper black sealed, middle white sealed and lower white unsealed.
2. Conform to ASTM international standards to ensure the authority and comparability of test results.
3. Each box of Encasement has a uniform specification and contains 250 sheets to meet the needs of batch testing.
4. The material is designed for the coating process, considering the anti-solubility requirements of different paints formulations.
Principle
The Opacity Chart provides contrasting black and white areas for objective measurement of the masking ability of paint or inks. Spreader the paint evenly on the test paper, and after drying, quantify its masking effect by measuring the reflectance ratio (% masking rate) of the black area and the white area after film. 100% masking rate means complete masking.
Applications
Paints, inks
Steps
1. Spreader paints and other paints evenly on the paints Opacity Chart according to the film steps.
2. After the film is fully dried by air, the instrument is used for objective evaluation.
3. The hiding power value can be measured and automatically displayed within 1 second.
Notice
• The hiding power test method can also be applied to the detection of cover rate of transparent film and plastic products.
• When performing levelling or sag tests, strictly follow ASTM standard methods (e.g. D 4062, D4400) and use designated supporting equipment (e.g. levelling device, sag protector, specific scratch paper).
Stirring, temperature adjustment, viscosity adjustment and necessary pre-shear treatment should be carried out before testing.
• Spreader processes need to control the speed (e.g. levelling test about 60 cm/s, sag test about 150 mm/s) and maintain environmental conditions (e.g. 23 ° C).
• The rating of levelling and sag is subjective and needs to be compared and judged in combination with the standard board. Its index value should be used as a comparison tool and interpreted in combination with practical application experience.
