Which adhesive is typically supplied in two parts that must be mixed prior to use?

The adhesive that is typically supplied in two parts that must be mixed prior to use is epoxy. Epoxy adhesives consist of a resin and a hardener that, when combined, undergo a chemical reaction to cure and bond materials together. This two-part system allows for a strong bond with enhanced durability and resistance to environmental factors, making epoxy suitable for a wide range of applications, including construction and repairs.

In contrast, white glue and silicone rubber are single-component adhesives that do not require mixing before use. White glue, also known as PVA (polyvinyl acetate) glue, is designed for easy application and dries clear. Silicone rubber is typically used for sealing and bonding in various applications and also comes pre-mixed, allowing for straightforward application without the need for preparation. Contact cement, similarly, is available in a single formulation that adheres surfaces upon contact and does not require mixing.