Hardener


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hardener

[′härd·ən·ər]
(metallurgy)
A master alloy added to a melt to control hardness.
(organic chemistry)
Compound reacted with a resin polymer to harden it, such as the amines or anhydrides that react with epoxides to cure or harden them into plastic materials. Also known as curing agent.

Hardener

 

in metallurgy, an auxiliary alloy used to introduce alloying elements into liquid metal for the purpose of imparting specific properties to the metal melt (for example, fluidity) or the solidified metal (increased mechanical strength). The assimilation of an alloying element from the hardener is greater and more stable than if the element were introduced in pure form. Hardeners are produced by fusion of their components or by reduction from ores, concentrates, or oxides. In ferrous metallurgy, hardeners are distinguished from ferroalloys, which are used for both alloying and deoxidation of metals. Metals that are added to precious metals (for example, gold or silver) to impart to them the necessary properties (for example, hardness) or to reduce the cost of manufactured articles are also called hardeners. Copper and mercury are used as hardeners.

hardener

1. A chemical (including certain fluosilicates or sodium silicate) applied to concrete floors to reduce wear and dusting.
2. A material added to a paint or varnish vehicle to increase the gum or resin content, or to increase rate of oxidation, so as to cause an increase in hardness of the drying film.
3. The chemical component in a two-component coating or adhesive which causes the resin component to harden.
References in periodicals archive ?
Understanding Hardener Selection for Good Anticorrosion Performance (SSR)
The European Epoxy Hardener Industry Report 2014 is a professional and in-depth study on the current state of the European epoxy hardener industry.
Expanding on its previously available options for the HydraLiner Lateral Lining system, HammerHead's new single base resin system comes with three choices of curing agent hardeners.
16) Therefore, unusual Lewis acids like BF3 have been used, but this type of hardener is less attractive for industrial applications.
In case of excess of ferrosilicon, the whole vanadium in the produced hardener binds into silicides, that causes increase of weight share of silicon in the metal.
The entire facility is enclosed, with the tipping floor made of 10-inch concrete with a hardener on the top layer.
AU 50 polymerized initiator, catalyst, or hardener is primarily designed for use in urethane resin systems and can be used in unsaturated polyester systems, vinyl ester resins, vinyl monomers, etc.
Sikafloor MetalTop is a dry shake surface hardener containing specially graded non-oxidising metallic aggregates.
The thermoplastic is dissolved in the solvent and the hardener is capable of reaction with the solvent, wherein the reaction product that can be formed from the solvent and the hardener is not miscible with the thermoplastic.
Bulk sand is fed directly into the mixer using compression (such as a vacuum conveyor) and then is mixed with the hardener on demand from the system's process station.
The Perfect Flow from Michael Engineering is powered by an air cylinder that operates on two double-acting piston pumps, which deliver constant flow of resin and hardener to the mixer, the company says.