Brightness Tester is used for measuring whiteness of paper and cardboard, paper pulp and chemical fiber pulp, cotton and chemical fiber, textile, plastic, ceramics, enamel, starch, salt, white cement, porcelain clay, talcum powder and also optical properties of tissue material such as opacity.
Applications :
Paper, Board, Pulps, Chemical fiber, Textile, Plastic, Ceramic, Enamel, Fecula, Salt, White cerement, Porcelain clay and French chalk etc.
Features :
1.Measure the Blue Reflectance Factor (R457) of samples. Blue Reflectance Factor is so called “Blue Whiteness†or “ISO Brightnessâ€.
2. Analyze the sample to find out whether it contains any fluorescent brightener. If so, measure the fluorescent whiteness further, namely whitening rate.
3. Measure the opacity, transparency, light scattering coefficient and light absorbing coefficient.
Specifications:
1.This instrument complies with GB3978-83; Standard illuminator and illuminating-- viewing conditions.
2.Simulate D65 illuminator to illuminate. Adopt d/o illuminating--viewing geometrical conditions. Diameter of the diffusion sphere is 150mm and diameter of the testing hole is 25mm.
3.Light absorber is provided to eliminate the effect of specular reflection. Peak wavelength of spectral power distribution of R457 whiteness optical system is 457nm and its half-width is 44nm.
4. Measure and display the whiteness, Fluorescent whiteness (whitening rate) and opacity (%) etc. digitally.
Applicable Standards : Meets ISO 2469, ISO 2470, ISO 2471, GB/T 7933, GB/T 7974, GB/T 8940.2, GB/T 1840, GB/T 2913, GB/T 13025.2, GB/T 1543, ISO 2471, GB/T 10339, GB/T 5950 Etc.
