Which of these is a product typically made using injection molding?

Injection molding is a manufacturing process used to create parts by injecting molten material into a mold. It is particularly effective for producing complex shapes with high precision and for utilizing thermoplastics, which can be easily melted and reshaped.

Hollow plastic containers are commonly made using injection molding due to the ability of this process to create detailed designs and uniform wall thicknesses. The hollow structure allows for efficient production, and the finished containers can be used for a variety of applications, including packaging for food and beverages.

In contrast, other options like pipes are typically formed through processes such as extrusion, where materials are forced through a die to form long shapes, rather than being molded. Plastic bags are usually manufactured using blow molding or film extrusion, which permits the production of thin, flexible, and lightweight materials. Foam insulation is generally made through processes like foaming or using specialized molding techniques that do not align with the principles of injection molding.