Liquid epoxy hardener is a type of liquid catalyst that is used to cure and harden two-part liquid epoxy resin. Epoxy hardener is typically added to the epoxy resin at a specific ratio to initiate the curing process, causing the mixture to harden into a solid material. The hardener can be made from a variety of chemical compounds, depending on the specific application and requirements of the project. Liquid epoxy hardener is commonly used in applications such as adhesive bonding, coating, and casting. It is important to follow the manufacturer's instructions carefully when mixing epoxy resin and hardener, as the wrong ratio or improper mixing can result in an incomplete cure or a weak bond. Additionally, it is important to use epoxy hardener in a well-ventilated area and with proper protective equipment, as it can release harmful fumes during the curing process.