Normal use levels of respirable cosmetic talc: preliminary study

Area of Science:

• Cosmetic science
• Occupational hygiene
• Analytical chemistry

Background:

• Cosmetic talcs are widely used in personal care products.
• Assessing the safety-in-use of cosmetic talcs requires understanding airborne particle generation.
• Previous studies lacked standardized methods for measuring respirable talc during product application.

Purpose of the Study:

• To establish and validate methods for collecting and analyzing respirable talc particles generated from cosmetic powders.
• To quantify in-use airborne concentrations of talc from various cosmetic formulations.
• To inform the design of future comprehensive safety investigations for cosmetic talcs.

Main Methods:

• Development of a sampling method using cyclones to separate respirable particles from larger ones.
• Collection of airborne particles on membrane filters.
• Analysis of collected talc samples for magnesium content via atomic absorption spectroscopy to determine talc concentration.

Main Results:

• Mean airborne talc concentrations varied by product type: 0.48 mg/m³ (loose face powder), 1.13 mg/m³ (Italian 00000 grade talc), and 0.21 mg/m³ (baby dusting powder).
• Micronized adult dusting powder exhibited higher mean concentrations (1.9 mg/m³).
• Perfume presence and moderate relative humidity (54-74%) did not significantly affect talc levels, while high humidity (>90%) reduced them.

Conclusions:

• The developed analytical method effectively quantifies respirable talc in cosmetic products during use.
• In-use airborne talc concentrations differ significantly across product types, with micronized dusting powders posing potentially higher exposure risks.
• Further research is warranted to establish definitive safety thresholds for cosmetic talc inhalation.