Precision tools like lash combs require rigorous quality control because their teeth are fine and used near the eyes. A single burr or misalignment can lead to injury or a poor user experience.
Key Testing Protocols:
The Pull Test (Tensile Strength): For combs with metal teeth, factories test the “pull-out” force of individual teeth to ensure they don’t detach and fall into the eye during use.
Microscopic Burr Inspection: Using 10x or 20x magnification, QC inspectors check for “flash” (excess plastic or metal) on the tips. High-end tools undergo a polishing tumble to ensure every edge is rounded.
Alignment Tolerance: For folding lash combs, the hinge is tested for over 5,000 opening/closing cycles to ensure the teeth always align perfectly with the protective guard.