Polyethylene (PE) and polypropylene (PP) plastics are known for their resistance to solvents and glues, making them challenging materials to bond. However, for successful adhesion, the use of specialized adhesives or surface treatments is recommended. One effective solution is using a two-component epoxy specifically designed for polyolefins, which includes a primer to modify the surface energy of PE and PP, improving bond strength. Another option is a cyanoacrylate adhesive, also known as super glue, formulated for use with polyolefins. For best results, surface preparation by cleaning and roughening is essential. Additionally, some manufacturers offer adhesives made specifically for PE and PP, which may include a built-in primer. It's crucial to follow the manufacturer's application instructions for maximum effectiveness.

Polypropylene (PP) is a thermoplastic polymer used extensively due to its unique properties such as resistance to chemicals, elasticity, and toughness. An everyday example of polypropylene is food containers. These containers are popular because PP does not leach chemicals into food and can withstand the rigors of microwave heating and dishwasher cleaning. Furthermore, its ability to resist fatigue makes it an ideal choice for lids that need to be opened and closed repeatedly. Beyond kitchen uses, polypropylene is employed in automotive parts, medical devices, and textiles, showcasing its versatility across industries. Its recyclability also underscores its appeal amidst growing environmental concerns.

Polypropylene is a type of plastic, more specifically, a thermoplastic polymer that is widely used in a variety of applications ranging from packaging, textiles, automotive components, to household products. Its versatility is due to its resistance to various chemical solvents, bases, and acids. Unlike rubber, which is an elastomer and can be either natural or synthetic, polypropylene is strictly synthetic and produced through the polymerization of propylene gas. It's known for its stiffness and resistance to fatigue, making it unsuitable for applications that require the flexibility and elasticity properties of rubber. Therefore, while both materials have their distinct uses in industry and manufacturing, polypropylene falls squarely in the plastic category rather than rubber.