LimsPulse
Cosmetics testing

In vitro SPF analyser (UV transmittance analyser)

Measures how much ultraviolet light passes through a thin film of sunscreen spread on a roughened PMMA plate, then calculates in vitro SPF, UVA protection factor and critical wavelength from the transmittance spectrum.

  • Cosmetics & personal care
  • Sunscreen manufacturers
  • UV filter suppliers
  • Contract testing labs
  • Textiles (UV protection)
Illustration of In vitro SPF analyser (UV transmittance analyser)
CALIBRATION

SPF analyser calibration procedures

Wavelength and transmittance verification

Checks that the SPF analyser reads wavelengths correctly with a holmium oxide filter and reads transmittance correctly with certified neutral-density (or UV-absorbing) filters, then confirms the whole system with a reference sunscreen.

Open procedure
QUALIFICATION

Instrument qualification (DQ · IQ · OQ · PQ)

  1. 01

    DQ — Design qualification

    Defines needs: wavelength range 290–400 nm, resolution, dynamic range of absorbance, integrating sphere, solar simulator, plate types and software compliant with data-integrity rules.

  2. 02

    IQ — Installation qualification

    Confirms the instrument, solar simulator, software and accessories are installed as specified, with serial numbers, manuals and environmental conditions recorded.

  3. 03

    OQ — Operational qualification

    Verifies wavelength accuracy, transmittance accuracy and linearity with certified filters, baseline stability, stray light and solar simulator irradiance.

  4. 04

    PQ — Performance qualification

    Shows the system gives correct results in routine use, for example a reference sunscreen measured on several plates falls within its expected range.

In LimsPulse · Calibration Management

Keep every SPF analyser in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.

See how