KMID : 1156220180440030238
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Journal of Environmental Health Sciences 2018 Volume.44 No. 3 p.238 ~ p.243
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Determination of Skin Adhesion Rate of Children's Modeling Clay for Exposure Assessment
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Kuag Soo-Young
Lim Mi-Young Shin Hye-Rin Park Ji-Young Lee Ki-Young
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Abstract
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Objectives: The purpose of this study was to determine skin adhesion rate of children¡¯s modeling clay for exposure assessment.
Methods: Children¡¯s modeling clays were classified into 10 categories as PVA clay, PVA soft clay, starch-based clay, foam clay, rubber clay, oil clay, muddy clay, terra clay, paper clay and slime. A total of 26 children¡¯s clay goods was selected. Moisture content (%) and hardness of clays were measured. Five adults aged 20 to 25were recruited for experiment. Gravimetric difference of modeling clay was determined after 3 minutes playing time. Skin adhesion rate (g/min/cm2) was estimated bythe amount of skin adhesion per minute (g/min) and each individual¡¯s palm surface area (cm2).
Results: Twenty four of the 26 children¡¯s modeling clay products were adhesive to skins. Two products of foam and rubber clay were not adhered to skin. For the 24 products, the average skin adhesion rate was 5.5¡¿10-4¡¾4.0¡¿10-4 g/min/cm2
. The highest skin adhesion rate was 1.3¡¿10-3¡¾4.4¡¿10-4 g/min/cm2 for paper clay. The lowest skin adhesion rate was 4.6¡¿10-5¡¾1.1¡¿10-4 g/min/cm2 for oil clay. The skin adhesion rate was increased with increase of moisture content. Adhesion rates of some clays were varied by person and testing trials.
Conclusion: The study determined skin adhesion rate of children¡¯s modeling clay. The adhesion rate is useful for exposure and risk assessments and setting safety guideline to protect children¡¯s health.
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KEYWORD
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Adhesion, Children, Exposure assessment, Modeling clay, Skin adhesion rate
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