Carpet beetles, known for their diet based on animal products like wool, silk, feathers, and leather, do not typically consume synthetic materials such as polypropylene. These synthetic fibers lack the natural proteins that carpet beetles seek in their diet. However, it's important to note that while they may not eat polypropylene, carpet beetles might still inhabit areas with synthetic carpets if there are other sources of food available, such as spilled food, pet hair, or natural fibers mixed into the synthetic carpet. To prevent an infestation, regular vacuuming and prompt cleaning of spills are recommended, even on synthetic carpets.

Titanium dioxide is a common food coloring and additive found in various products. including dog food. While the FDA generally deems it safe. there has been controversy surrounding its use due to possible health implications. This risk is mitigated by the size of the particles. which are larger and therefore less likely to enter the skin or mucous membranes. However. research has suggested that prolonged exposure could lead to harm. For those seeking more natural options for their pets. avoiding titanium dioxide and other colorants in their food may be beneficial as they are typically used in small amounts and not likely to cause significant harm.

A polymer matrix forms the continuous phase in composite materials, holding together the reinforcing fibers or fillers to provide shape and transfer stresses between the reinforcing components. They are primarily made from polymers, which are large molecules composed of repeating subunits, giving the material its unique properties like flexibility, durability, and resistance to corrosion. Polymer matrices can be thermosetting, which cure and harden with heat or other means and don’t remelt, or thermoplastic, which can be melted and reshaped. Applications range widely from aerospace to sporting goods due to their lightweight and high strength-to-weight ratio, alongside the flexibility in their mechanical properties that can be tailored to specific needs.