Lash extension glue is a type of adhesive used to attach eyelash extensions to natural lashes. The ingredients in lash extension glue can vary depending on the product, but some common ingredients include:

• Cyanoacrylate: This is a major component of all professional eyelash extension glue and is the base material for all fast-curing glue. It gives the lash glue its unique curing property, ensuring the adhesive dries in a matter of seconds and holds the lashes firmly in place for several weeks.

• Poly (methyl methacrylate) (PMMA): This is another hardening agent used to reinforce and strengthen the ethyl cyanoacrylate. The ethyl cyanoacrylate creates a quick bond, and PMMA creates a strong bond, resulting in an unbreakable bond.

• Hydroquinone: This ingredient helps prevent the glue from hardening in the glue bottle and stops the glue from hardening before you actually start using it. It is present in the lash adhesive in very small amounts.

• Carbon Black: This is a form of solid carbon that can be used as a dye to give lash adhesive a rich, dark black finish. It can also be used as a filler to give reinforcing effects in adhesive.

• Latex: A small amount of latex in lash glue helps to increase the resistance of the adhesive to water and oil, which in turn helps to create longer retention. However, latex is known to cause allergic reactions in some people, and when it happens, it can be quite dangerous. These days, most of the lash extension suppliers exclude latex from its ingredient list to ensure client safety.

When choosing a lash extension glue, it is important to ask the manufacturer for a Material Safety Data Sheet (MSDS) to be sure of the ingredients and their composition in the product. Additionally, it is recommended to avoid oil-based products, products containing alcohol, and products with formaldehydes, cyanoacrylates, and latex to minimize the risk of irritation or damage to the lashes.