Final_ColdsurfMS_revisions_Annocchyg_2006.pdf (469.26 kB)
Temperature limit values for touching cold surfaces with the fingertip
journal contribution
posted on 2007-01-04, 10:20 authored by Q. Geng, Ingvar Holmer, Emiel A. den Hartog, George Havenith, Oliver E. Jay, J. Malchaire, A. Piette, Hannu Rintamaki, S. RissanenOBJECTIVES: At the request of the European Commission and in the framework of the
European Machinery Directive, research was performed in five different laboratories to
develop specifications for surface temperature limit values for the short-term accidental
touching of the fingertip with cold surfaces. METHODS: Data was collected in four
laboratories with a total of twenty males and twenty females performing a grand total of 1655
exposures. Each touched polished blocks of aluminium, stainless steel, nylon-6 and wood using
the distal phalanx of the index finger with a contact force of 1.0, 2.9 and 9.8 N, at surface
temperatures from +2 and -40ºC for a maximum duration of 120 seconds. Conditions were
selected in order to elicit varying rates of skin cooling upon contact. Contact temperature (TC)
of the fingertip was measured over time using a T-type thermocouple. RESULTS: A database
obtained from the experiments was collated and analysed to characterise fingertip contact
cooling across a range of materials and surface temperatures. The database was subsequently
used to develop a predictive model to describe the contact duration required for skin contact
temperature to reach the physiological criteria of onset of pain (15ºC), onset of numbness (7ºC)
and onset of frostbite risk (0ºC). CONCLUSIONS: The data reflect the strong link between the
risk of skin damage and the thermal properties of the material touched. For aluminium and
steel, skin temperatures of 0ºC occurs within 2 to 6 s at surface temperatures of -15ºC. For nonmetallic
surfaces, onset of numbness occurs within 15 to 65 s of contact at -35ºC and onset of
cold pain occurs within 5 s of contact at -20ºC. The predictive model subsequently developed
was a non-linear exponential expression also reflecting the effects of material thermal
properties and those of the materials initial temperature. This model provides information for
the protection of workers against the risk of cold injury by establishing the temperature limits
of cold touchable surfaces for a broad range of materials, and is now proposed as guidance
values in a new international standard (ISO/DIS 13732-3, 2005).
History
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Pages
428798 bytesCitation
GENG, G. ... et al (2006). Temperature limit values for touching cold surfaces with the fingertip. Annals of Occupational Hygiene, 50 (8), pp. 851-862.Publisher
© The Author 2006. Published by Oxford University Press on behalf of the British Occupational Hygiene SocietyPublication date
2006Notes
This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Annals of Occupational Hygiene following peer review. The definitive publisher-authenticated version [GENG, G. ... et al (2006). Temperature limit values for touching cold surfaces with the fingertip. Annals of Occupational Hygiene, 50 (8), pp. 851-862] is available online at: http://annhyg.oxfordjournals.org/cgi/content/abstract/50/8/851ISSN
0003-4878;1475-3162Language
- en