Polypropylene (PP), a durable and flexible polymer, is widely used in various applications, from packaging to automotive parts. Its shelf life primarily depends on environmental conditions such as exposure to UV light, oxygen, and thermal degradation. Under optimal storage conditions—away from direct sunlight, extreme temperatures, and oxidative agents—polypropylene can last indefinitely. However, when exposed to harsh conditions, its properties can degrade over time, causing brittleness and discoloration. To extend its shelf life, storing PP products indoors or in a cool, dark place is advisable. Advanced stabilization formulations can also enhance its resistance to degradation, making it a reliable choice for long-term applications.

Motor oil does not conduct electricity, and motor oil has a very low conductivity, allowing it to be used as an insulating oil or transformer oil. Motor oil is an insulator and contains almost no free-moving charges, because most of the free electrons and free ions inside it are bound by atomic nuclei, so it is not easy to conduct electricity. However, under certain circumstances, such as the presence of metallic additives in the oil, the oil may have some electrical conductivity.

Yarn materials encompass a variety of fibers, both natural and synthetic, twisted or spun into long, interlocking strands. Natural yarns derive from plants (cotton, linen), animals (wool, silk), or insects (silk). Synthetic yarns, on the other hand, are made from man-made fibers like polyester, nylon, and acrylic. These materials are chosen based on their properties, such as strength, elasticity, softness, and weather resistance. The diversity in yarn materials allows for a broad range of applications, from clothing and upholstery to industrial uses. The choice of yarn material significantly affects the texture, durability, and care requirements of the final product, making the selection a critical step in everything from fashion design to crafting.