The density of linear low-density polyethylene (LLDPE) typically ranges from 0.915 to 0.925 g/cm³. This slight variation in density is due to the copolymerization process that incorporates different amounts of alpha-olefins (like butene, hexene, or octene) into the polyethylene chain. The unique structure of LLDPE, characterized by its short and linear branches, results in a material that offers excellent toughness, flexibility, and resistance to impact and punctures compared to low-density polyethylene (LDPE). Additionally, LLDPE's lower density makes it an optimal choice for applications requiring a mix of durability and lightness, such as in film applications, bags, containers, and covers. Its properties and density also allow for more efficient packaging with reduced material usage without compromising strength or integrity, offering environmental and economic benefits.

The title of the fastest engine in the world currently belongs to the scramjet engine, specifically exemplified by NASA's X-43A. This experimental aircraft reached a record-breaking speed of Mach 9.6 (approximately 7,000 miles per hour) in 2004. Scramjet stands for Supersonic Combustion Ramjet—a technology enabling sustained hypersonic flight by mixing fuel with high-speed air while traveling faster than the speed of sound. Unlike traditional rocket engines that carry both fuel and an oxidizer, scramjets draw oxygen from the atmosphere, significantly reducing weight and potentially revolutionizing high-speed travel and access to space. While the practical applications of scramjets are still under development, their capability to achieve unparalleled speeds positions them at the forefront of aerospace technology.

As with all metals. in some cases scratches may occur when they come into contact with materials harder than they are. such as diamonds or abrasives.