Since the reform and opening up, China's cosmetics market has experienced remarkable growth, with an average annual sales increase of 23.8%. By 2012, despite challenges from both domestic and international markets, the retail sales of cosmetics above a designated size in China still rose by 17.0% year-on-year. However, this marked a slight decline compared to 2011, as the overall economic environment slowed down. In response, the market has placed higher demands on the quality of various cosmetic products.
Cosmetics typically come in powder or emulsion forms, and their performance is influenced by factors such as particle size, shape, flowability, emulsion stability, and composition. Regulatory requirements for ingredients have also become more stringent, especially concerning particles like those found in antiperspirants, hair gels, toothpaste, facial care products (such as lipsticks, mascaras, and eyeshadows), nail polish, and more. Particle size plays a critical role in determining the final properties of these products, including humectants and exfoliating creams.
For example, in spray-based products like deodorants and hair sprays, the particle size of the active ingredients significantly affects their performance. If the antiperspirant particles are too small, they may not effectively block pores, leading to reduced effectiveness in controlling sweat. Similarly, the softness and retention of hair gel depend on the particle size of the gelatin used. If the particles are too fine, the product might be inhaled by the user, which can be uncomfortable or even harmful.
In toothpaste, particle size directly impacts its performance. Common ingredients include abrasives and whitening agents like calcium carbonate and titanium dioxide. The particle size distribution of these materials determines the color and plaque-removal efficiency of the toothpaste.
Facial products such as lipstick, mascara, and eyeshadow are also highly dependent on particle size. The color intensity of lipstick is affected by the type of pigment and its particle size distribution. A wider range of particle sizes can create a more noticeable frosted effect. The presence of fine particles influences the color and adhesion of the product. When formulating eyeshadows, particle size plays a role in the creaming effect. High-quality eyeshadows tend to have uniform, small particles that blend well with the skin, providing longer wear and reducing the risk of creasing around the eyes.
Mascara often contains filaments that enhance eyelash length and strength. These additives help maintain curl and prevent lashes from falling out. Controlling the particle size of these components is crucial for achieving the desired results. A broader particle size distribution can lead to premature shedding, while a narrower range ensures better performance.
In summary, particle size testing has become an essential part of cosmetic R&D. Traditional chemical methods are being replaced by advanced instrument-based techniques, with laser particle size analyzers becoming the most commonly used tool. These devices offer fast, accurate, and comprehensive analysis, making them ideal for modern cosmetic manufacturing. Since China's "7th Five-Year Plan" for scientific research, the particle testing industry has grown rapidly, with many innovative companies emerging. The ability to test both dry and wet samples is crucial, and instruments like the WINNER2308 dry-wet integrated laser particle size analyzer from Jinan Micro-Nano have proven invaluable in guiding R&D and production. Their effectiveness has led to widespread acceptance in the cosmetics industry.
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