Hydroxypropyl cellulose (HPC) is considered safe for consumption and is generally recognized as safe (GRAS) by the Food and Drug Administration (FDA). It functions as a thickener, emulsifier, and coating agent in various food products such as cheese, bakery items, and salad dressings. HPC is derived from cellulose, a natural polymer and a key structural component of the cell wall in plants. Unlike some food additives that can lead to health concerns, hydroxypropyl cellulose is non-toxic and has a minimal risk of adverse effects when consumed in typical amounts found in foods. It's not absorbed by the human body but passes through the digestive system unchanged. However, as with any food additive, moderation is important, and individuals with specific health conditions or dietary restrictions should consult healthcare professionals before increasing their intake of products containing HPC.

USP mineral oil is indeed food grade, as it meets the strict standards set by the United States Pharmacopeia (USP) for purity and safety for human consumption. It is a highly refined, clear, odorless, and tasteless oil derived from petroleum. The designation "USP" indicates that the mineral oil adheres to the specifications outlined in the USP, which ensures its safety for various applications, including as a lubricant in food handling machinery, a protective coating for food products, and as an ingredient in some types of food. Its safety and efficacy for such uses are widely recognized, making it a valuable resource in both the pharmaceutical and food industries.

The strongest known material is graphene. a form of carbon atoms arranged in a two-dimensional honeycomb lattice. However. tungsten and steel are significantly heavier than titanium. so titanium is actually stronger.