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Related Experiment Videos

Temperature limit values for touching cold surfaces with the fingertip.

Q Geng1, I Holmér, Den E A Hartog

  • 1Swedish Institute of Agricultural and Environmental Engineering Box 7033, SE-750 07 Uppsala, Sweden. qiuqing.geng@jti.slu.se

The Annals of Occupational Hygiene
|June 17, 2006
PubMed
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This study developed a predictive model for cold surface contact duration to prevent skin injury. It establishes safe touch temperatures for various materials, crucial for worker protection against cold hazards.

Area of Science:

  • Thermal physiology
  • Materials science
  • Occupational safety

Background:

  • European Machinery Directive requires specifications for cold surface contact.
  • Accidental fingertip contact with cold surfaces poses a risk of skin injury.
  • Existing data insufficient for establishing precise surface temperature limits.

Purpose of the Study:

  • To develop specifications for surface temperature limit values for fingertip contact with cold surfaces.
  • To create a predictive model for safe contact duration based on material properties and temperature.
  • To provide guidance for protecting workers from cold-induced skin injuries.

Main Methods:

  • Multi-laboratory study involving 40 participants (20 male, 20 female).
  • 1655 exposures with fingertip contact on aluminum, stainless steel, nylon-6, and wood.

Related Experiment Videos

  • Varied contact forces (1.0-9.8 N), surface temperatures (-40°C to +2°C), and durations (up to 120s); measured fingertip contact temperature (TC).

    • Main Results:

    • Characterized fingertip cooling rates across different materials and temperatures.
    • Developed a predictive model correlating contact duration with skin temperature thresholds (pain, numbness, frostbite risk).
    • Model incorporates material thermal properties and initial temperature effects.

    Conclusions:

    • Strong link established between material thermal properties and skin damage risk.
    • Quantified contact times for critical temperatures (0°C, 7°C, 15°C) on various materials.
    • The predictive model is proposed as guidance for international standards on cold surface safety.