Homosalate, with the CAS number 118-56-9, is a commonly used chemical in the cosmetic and skincare industry. It is an ester formed from salicylic acid and 3,3,5-trimethylcyclohexanol. Homosalate appears as a clear to slightly yellowish, oily liquid at room temperature. It has a molecular formula of C16H22O3 and a molecular weight of approximately 262.34 g/mol. This product is typically supplied in high - purity grades, meeting the strict quality standards required for its various applications. The density of homosalate is around 1.04 g/cm³, and it has a boiling point in the range of 295 - 305 °C. It is soluble in most organic solvents such as ethanol, ether, and chloroform, but has limited solubility in water.
Homosalate is primarily used as a sunscreen agent in personal care products. It can absorb ultraviolet (UV) radiation in the UVB range (290 - 320 nm), which is responsible for causing sunburn, skin aging, and increasing the risk of skin cancer. By incorporating homosalate into sunscreen lotions, creams, and sprays, it helps to protect the skin from the harmful effects of UVB rays. In addition to sunscreens, it can also be used in other cosmetic products like moisturizers, lip balms, and makeup products to provide some level of UV protection. Moreover, homosalate can act as a stabilizer in certain formulations, helping to maintain the integrity and effectiveness of the product over time.
When using homosalate - containing products, it is important to follow the instructions carefully. For sunscreen products, apply an adequate amount evenly to all exposed skin areas at least 15 - 30 minutes before sun exposure. Reapply the sunscreen every 2 hours, or more frequently if swimming, sweating, or towel - drying. When formulating cosmetic products with homosalate, it should be added at the appropriate stage of the manufacturing process. Generally, it is added during the cooling phase of the emulsion preparation to ensure proper dispersion and stability. The recommended concentration of homosalate in sunscreen formulations is usually between 4% - 15%, depending on the desired sun protection factor (SPF) and the overall formulation of the product.
Case 1: Beach Vacation
A family is going on a beach vacation. They bring a sunscreen lotion containing homosalate. Before going to the beach, each family member applies the sunscreen generously on their face, neck, arms, and legs. During the day, they reapply the sunscreen every couple of hours, especially after swimming. As a result, none of them get sunburned, and their skin remains protected from the strong UV rays at the beach.
Case 2: Outdoor Sports Event
A group of athletes is participating in an outdoor running event. They use a homosalate - based sunscreen spray. The spray is easy to apply evenly on their exposed skin, even when they are on the move. This allows them to focus on the race without worrying about sun damage. After the event, their skin shows no signs of sunburn or excessive redness.
Case 3: Cosmetic Product Formulation
A cosmetic manufacturer is developing a new moisturizer with added UV protection. They incorporate homosalate into the formulation at a concentration of 5%. During the manufacturing process, they add homosalate during the cooling phase of the emulsion. After rigorous testing, the product shows good stability and provides a satisfactory level of UV protection, meeting the market demand for multi - functional skincare products.
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