LASH MATERIALS & PRODUCT KNOWLEDGE SECTION 1: LASH MATERIALS What Are Lash Extensions Made Of? Modern professional lash extensions are primarily manufactured from synthetic PBT (Polybutylene Terephthalate). PBT is an engineered polyester fiber that is: Synthetic PBT fibers are preferred over animal-derived materials because they: Contemporary lash artistry relies on precision-manufactured synthetic materials rather than … Continue reading The Louisville Beauty Academy Professional Eyelash Extension Training Manual – Clinical Safety, Technical Precision, and Practical Application – Chapter 1 – Foundations of Lash Materials, Structural Safety, and Infection Control