hardener
Noun: A substance or agent that makes something harder, typically by causing a chemical reaction or physical change. In technical contexts, it is used to increase the hardness of materials such as plastics, paints, glues, or metals.
- (A chemical agent that triggers the hardening process.)
- (A substance that increases the paint's resistance to wear.)
- (A material applied to metal to increase its hardness.)
"Hardener in metallurgy": A substance (e.g., carbon or alloys) added to molten metal to increase its hardness after cooling.
- Adding chromium as a hardener improves the steel's strength.
"Hardener in polymer chemistry": A curing agent that cross-links polymer chains, turning a liquid resin into a solid.
- The hardener reacted with the resin to form a rigid plastic.
Harden (verb): to make or become hard or harder.
- The varnish will harden overnight. (The coating will solidify.)
Hardened (adjective): made hard or unyielding; also, experienced or calloused.
- The hardened steel is resistant to scratches. (The steel has been treated to be hard.)
Hardness (noun): the quality of being hard; resistance to pressure or indentation.
- The hardness of the diamond makes it ideal for cutting tools.
- Curing agent: a substance that promotes the hardening of a material.
- Stiffener: something that makes a material more rigid or less flexible.
- Toughener: an additive that increases a material's resistance to fracture.
"As hard as nails": extremely tough or unyielding (not directly related to hardeners, but metaphorically linked to hardness).
- After years in the army, he became as hard as nails. (He became physically or emotionally tough.)
"Hard and fast": rigidly fixed or unchangeable (used to describe rules, not materials).
- There are no hard and fast rules about using this hardener. (No strict regulations exist.)
- Harden up: to become harder or more resilient; often used figuratively.
- The glue will harden up if you leave it exposed to air. (The glue will solidify.)
- She had to harden up to deal with the criticism. (She became emotionally tougher.)