Eyelash Extensions Written Practice Exam

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Which ingredient is primarily used in most eyelash extension adhesives?

Silicone
Cyanoacrylate
Polyethylene glycol
Formaldehyde

The correct answer is: Cyanoacrylate

The primary ingredient used in most eyelash extension adhesives is cyanoacrylate. This compound is a fast-drying adhesive that forms a strong bond between the natural lashes and the extensions. Its properties allow for quick application and provide durability, making it ideal for eyelash extensions. Cyanoacrylate is known for its versatility in bonding materials, its low toxicity, and its ability to dry quickly upon exposure to moisture, which is crucial during the lash application process. This is essential for lash technicians who need a reliable adhesive that will hold the extensions securely in place for an extended period. The other options, while they may have applications in various cosmetic products, do not match the effectiveness and suitability of cyanoacrylate in eyelash extension adhesives. For example, silicone could be used in some formulations for its smooth texture, but it does not provide the necessary bonding strength. Polyethylene glycol is more commonly associated with skin conditions and moisturization rather than as a bonding agent. Lastly, formaldehyde is primarily noted for its preservative qualities and can be a concern for sensitivity and allergic reactions, making it an inappropriate choice for adhesive formulation in eyelash extensions.