Product Chemistry, Chemical Safety, and Hazard Communication
Chemistry basics
Products are acids, bases, salts, or solvents; pH, concentration, and exposure time set the hazard. Acetone and similar solvents are flammable and defat skin. Acrylic monomers and gel acrylates are skin sensitizers, and sensitization is cumulative - once allergic, a technician may be unable to keep working. Monomer-polymer reactions release heat, so a thick bead can burn the nail bed. Never mix products unless the manufacturer directs, never decant into unlabeled or beverage containers, and never bring food or drink to the service area.
OSHA Hazard Communication
Employers must keep a written hazard communication program, label every container, and maintain a Safety Data Sheet (SDS) for each hazardous product in the 16-section GHS format. Know which section answers which question: Section 2 hazards, Section 4 first aid, Section 5 firefighting, Section 6 accidental release, Section 7 handling and storage, Section 8 exposure controls and PPE, Section 9 physical properties. "MSDS" is the outdated term. Secondary containers need a label with the product identifier and hazard information. PPE includes nitrile gloves (latex and vinyl resist acrylates poorly), eye protection, and adequate ventilation - local exhaust at the table where required.
Traps and rule of thumb
Questions swap SDS section numbers, treat a sanitizer as a safety plan, or imply a dust mask protects against vapor. Others suggest gloves replace ventilation, or that "natural" and "organic" products are automatically safe. Eye splashes require immediate flushing and medical follow-up.
Rule of thumb: no label, no container - an unlabeled bottle is a violation no matter what is inside it.