Biaxially Oriented Polypropylene (BOPP) is a variant of polypropylene known for its strength, clarity, and ability to serve as a barrier against moisture and gases. It's primarily used in packaging, labeling, and lamination. The price of BOPP fluctuates based on factors such as crude oil prices, demand in the packaging industry, and production costs, including raw materials and manufacturing expenses. As of my last update in 2023, the exact price can vary greatly by region, specification, and volume purchased. However, bulk purchases typically result in a lower per-unit cost. For the most accurate and current pricing, it's advisable to contact suppliers directly or consult market reports. With sustainability being a concern, BOPP's recyclability and the industry's efforts to reduce environmental impact may also influence future pricing trends.

Viscose yarn is a type of yarn made from cellulose fiber derived from wood pulp. This semi-synthetic fiber undergoes chemical processing to produce a smooth, silky yarn that mimics the qualities of natural fibers like cotton and silk. It is known for its softness, high absorbency, and brilliant dye retention, making it popular in the production of clothing, home textiles, and fashion accessories. Despite its benefits, the production of viscose yarn has raised environmental concerns due to the chemicals used in its manufacturing process. Efforts are being made to create more eco-friendly methods of production. Viscose offers a versatile, affordable alternative for those seeking the luxury of silk with the practicality of cotton.

Polypropylene is a thermoplastic polymer that is notoriously difficult to bond with standard adhesives due to its non-porous surface and chemical resistance. For effective bonding, adhesives that are specially formulated for polyolefins are required. Cyanoacrylate (super glue) can work but is not always the most reliable. A more effective solution is to use a two-part epoxy designed for plastics, which can create a strong bond. Additionally, surface treatments such as corona or plasma treatment can improve adhesion by modifying the surface of the polypropylene, making it more receptive to glues. Adhesive manufacturers such as 3M offer products like Scotch-Weld Structural Plastic Adhesive specifically designed for polypropylene and similar plastics, providing a strong and durable bond.