Effects of pressure decay on Non-Methane Volatile Organic Compounds (NMVOC) species distribution in domestic aerosol sprays with LPG propellants

Abstract

Conventional aerosols sprays contain different Volatile Organic Compounds (VOC). These organic compounds have different properties and can have detrimental impact on air quality. This study investigated the spray performance and variation of the types of Non-Methane VOCs (NMVOCs) expelled over the life of pressurised aerosol spray can. Three types of aerosol sprayshair sprays, deodorants, and antiperspirants were selected from the solventbased cosmetic products. Mass Ratio (MR) of solvent (ethanol) to propellant (LPG) for all the products was analysed at pressure decay sequences of 4, 3, 2, and 1.5 bar. It was found that the MR in hair sprays expelled was significantly higher than that of antiperspirants and body sprays by 53% and 54% respectively at 4 bar. As the pressure depleted, however, the antiperspirant and body sprays' MR decreased while that of the hair spray increased. At the lower pressures (2 bar), the hair spray had the highest MR and antiperspirant had the lowest. This finding is important in evaluating the performance of the delivery pathways of aerosol spray products and will provide insight into the effective design of atomisers with alternative "green" propellants like compressed air replacing LPG as the primary propellant in spray products.

Decoding Cosmetic Complexities: A Comprehensive Guide to Matrix Composition and Pretreatment Technology

“…Propellants are essential for the ejection of contents from aerosol containers, such as hairspray. Common propellants include propane, butane, isobutane, and environmentally friendly options such as carbon dioxide and nitrogen [ 84 , 85 ]. The use of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) is severely restricted because of their ozone-depleting effects [ 86 , 87 ].…”