Whiteness Meter LWM-A10

Labtron’s whiteness meter LWM-A10 measures the whiteness of materials like paper, textiles, plastics, powders, and ceramics by projecting light—typically mimicking daylight (e.g., tungsten or D65 light sources)—onto a sample. In many models, the light strikes at a 45° angle and is diffusely reflected; a photocell then detects the blue-spectrum component (around 440–457?nm) while filters exclude longer visible wavelengths and UV, ensuring accurate readings. The resulting signal is compared against standards (commonly magnesium oxide or ISO-level whites), yielding a whiteness value on a defined scale. These instruments support daily calibration using white and black tiles, and modern devices include onboard data storage and connectivity options for importing data into lab systems.

Labtron’s whiteness meter LWM-A10 are essential quality control tools in industries where appearance and color consistency matter. In paper and pulp, they're used to assess brightness and ensure uniformity. Textile manufacturers rely on them to check bleaching and finishing results. Plastics and coatings producers use them to verify surface color uniformity, while cement, ceramics, paints, and enamel manufacturers ensure consistent whiteness in building materials. Food and powder sectors—such as sugar, flour, starch, salt, and cosmetic powders—use whiteness metrics to maintain quality and consumer appeal.

Labtron supplies advanced whiteness meter LWM-A10.Optical Brightening Agents (OBAs), also known as Fluorescent Whitening Agents (FWAs), absorb ultraviolet light (below 400?nm) and re-emit it as visible blue light (400–480?nm), making samples appear “whiter than white.” This fluorescence can push reflectance readings above 100%, skewing the perceived whiteness unless controlled. Whiteness meters incorporate UV filters or adjustable filter systems to mimic daylight (CIE D65), ensuring that measurements remain accurate and consistent by accounting for the fluorescent contribution.

Labtron supplies advanced whiteness meter LWM-A10.Different industries use different standardized whiteness indices. The CIE Whiteness Index (WCIE) calculates whiteness based on tristimulus values under D65 light and a 10° observer. ASTM E313 provides general whiteness/yellowness indices, referencing CIE methods. The Ganz-Griesser method, used often in textiles, includes UV calibration to control fluorescent effects. ISO standards like ISO 2470-1 (indoor brightness), ISO 2470-2 (D65 brightness), and ISO 2469 define measurement geometry and filtering protocols for blue reflectance, ensuring consistency across applications.

Labtron supplies advanced whiteness meter LWM-A10.Daily calibration with a dark trap (black reference) and a white tile is essential to maintain accuracy. Weekly UV calibration is recommended for fluorescent samples, using primary reference standards such as Hohenstein or Paprican to adjust UV-filter settings. Transfer tiles allow continued checks without constant primary standard use. Instruments may require full recalibration on a manufacturer’s schedule or after considerable wear. Monitoring lamp intensity and sphere coating helps drift and sustain reliability.