An emulsion is a mixture of two immiscible liquids, such as oil and water, where one liquid is dispersed in the other in small droplets, often stabilized by emulsifiers. Emulsions can break due to several factors: temperature changes can either increase the kinetic energy of the molecules causing them to separate or alter the structure of the emulsifying agent; pH changes can affect the charge and solubility of the emulsifier, leading to destabilization; the presence of salts or other chemicals can alter the electrostatic balance between the droplets; mechanical actions like stirring can coalesce droplets; and dilution can decrease the effectiveness of the emulsifying agent. Understanding these factors is crucial for industries like food, cosmetics, and pharmaceuticals, to ensure product stability and quality.

Polyvinyl Chloride (PVC) has raised environmental and health concerns due to toxic additives like phthalates and heavy metals used to enhance its properties. However, advancements in production technologies have led to the development of non-toxic PVC alternatives. These include bio-based plasticizers and PVC formulations that exclude harmful additives, making them safer for consumer use and the environment. Additionally, some manufacturers are adopting "green" chemistry principles to create PVC products that are less harmful and more sustainable. While these developments are promising, it's crucial for consumers to scrutinize product certifications and opt for those explicitly labeled as non-toxic or low-toxicity PVC to ensure they are choosing safer, environmentally friendly options.

Epoxy grout, known for its durability and resistance to stains and chemicals, is sold by various retailers and manufacturers worldwide. Home improvement stores like Home Depot and Lowe's offer a wide range of epoxy grouts from brands such as Custom Building Products, Laticrete, and Mapei. These stores typically have knowledgeable staff who can help you choose the right product based on your specific needs. Online platforms like Amazon also provide an extensive selection of epoxy grouts, often at competitive prices and with customer reviews that can guide your purchase decision. For professional-grade products, specialty tile supply stores and direct purchases from manufacturers might be more suitable. It's important to consider factors like color, curing time, and application area when selecting an epoxy grout.