Injection blow molding is a manufacturing process used to create hollow plastic parts such as bottles, jars, and containers. It involves three main stages: injection, blowing, and ejection. Initially, the plastic is melted and injected into a mold to form a preform. This preform is then transferred to a blow mold where air is introduced, inflating the preform against the mold walls, shaping it into the final product. Finally, the finished item is ejected from the mold. This method is widely favored for its precision in producing consistent, high-quality items with excellent surface finish, and its efficiency in mass production settings. It is particularly popular in the pharmaceutical, food and beverage, and cosmetic industries, where the demand for reliable and safe packaging solutions is high.

Titanium dioxide, often used in sunscreens, can potentially harm coral reefs. Studies suggest it can increase the likelihood of coral bleaching, a stress response that can lead to coral death, especially when combined with warming sea temperatures. Titanium dioxide can also react with sunlight and seawater to produce hydrogen peroxide, a compound harmful to all forms of marine life. Therefore, it's recommended to use reef-safe sunscreens that do not contain titanium dioxide when swimming near coral reefs.

The minimum wall thickness for polypropylene (PP) components largely depends on the application, molding process, and part design. Generally, for injection-molded PP, a minimum wall thickness of 0.8mm to 2.5mm is typical. This range accounts for a balance between strength, flexibility, and efficient processing. Thin walls are desirable for reducing material usage and cycle time, but too thin may lead to defects or compromised structural integrity. For specific applications, considering the mechanical requirements and environmental conditions is crucial. Adjusting wall thickness might be necessary to meet particular strength or durability needs. Additionally, uniform wall thickness is recommended to minimize stress concentrations and warping.