XT-48B Whiteness tester/Whiteness meterDetailed product description：

1. Purpose
XT-48B Whiteness Tester/Whiteness Meter mainly measures the whiteness of various objects such as paper and cardboard, pulp and synthetic fiber pulp, cotton and synthetic fiber, textiles, plastics, ceramics, pond porcelain, starch, salt, white cement, porcelain clay, talcum powder, etc. It can also measure the optical properties such as opacity of thin sheet materials.
1. The measurement of the diffuse reflectance factor of blue light (R457) of the sample is called "blue light whiteness" or "ISO brightness".
2. Analyze whether the sample material contains fluorescent whitening agents and determine the fluorescence whiteness generated by fluorescence emission, i.e. whitening degree.
3. Measure the brightness stimulus value Y10 of the sample, which is the diffuse reflectance factor Ry of green light.
4. Measure the opacity, transparency, light scattering coefficient, and light absorption coefficient of the sample.
5. Measure the ink absorption value of paper and cardboard.

2、 XT-48B Whiteness Tester/Whiteness Tester Main Technical Features

1. This instrument complies with GB3978-83; Standard lighting fixtures and lighting observation conditions. Simulate D65 illumination body lighting. Using d/o illumination to observe geometric conditions, the diameter of the diffuser sphere is 150mm, the diameter of the test hole is 30mm, and a light absorber is installed to eliminate the influence of mirror reflection light on the sample. The peak wavelength of the spectral power distribution of the R457 whiteness optical system is 457nm, with a full width at half maximum of 44 nm. The Y10 optical system complies with GB3979-83; Object color measurement method.
2. Measure and digitally display whiteness, fluorescence (whitening) whiteness, opacity (%), etc.
3. Zero drift: ≤ 0.1
4. Indication drift: ≤ 0.1
5. Indication error: ≤ 0.5
6. Repetitive error: ≤ 0.1
7. Mirror reflection error: ≤ 0.1
8. Sample size: The test plane should not be less than 30mm, and the sample thickness should not exceed 40mm
9. Power supply: AC 170-264V (wide voltage range), 50Hz, 0.2A
10. Working environment: Temperature range of 0-40 ℃, relative humidity not exceeding 85%
11. Size and weight: Length x Width x Height=365 x 260 x 425 mm, 11k

3、 Execution standards
GB7933-87: Determination of diffuse reflectance factor of pulp, paper and paperboard (d/o method);
GB7974-87: Determination of whiteness of paper and paperboard (d/o method);
ISO 2470: Determination of diffuse reflectance factor of blue light on paper and paperboard (ISO whiteness);
GB 8940.2: Method for determination of pulp whiteness.
GB 1840: Method for determination of industrial potato starch.
GB 2913: Plastic whiteness test method.
GB 13025.2: General test methods for salt industry, determination of whiteness.
GB 1543-88: Determination of opacity of paper.
ISO 2471: Determination of opacity of paper and paperboard.
GB10339-89: Method for determination of light scattering coefficient and light absorption coefficient of paper and pulp.
GB T/5950: Measurement method for whiteness of building materials and non-metallic mineral products.
Textile industry standard: Determination method for whiteness of chemical fiber pulp.