1. Plural of hardener; substances or agents added to materials to make them harder, stronger, or more durable.
Usage: commonly used in chemistry, manufacturing, and construction contexts
2. In epoxy and resin applications, chemical compounds that cure or set the base material through a chemical reaction.
Usage: technical; common in adhesives, coatings, and composite manufacturing

Examples

• The epoxy hardeners must be mixed in the correct ratio for the adhesive to set properly.
• Steel hardeners are used in metallurgy to increase the strength of alloys.
• The paint formula includes several hardeners to improve durability and scratch resistance.
• Different hardeners produce varying cure times and final material properties.
• Industrial hardeners are essential in manufacturing composite materials for aerospace applications.
• The technician selected specialized hardeners designed for high-temperature applications.