The one-piece amber glass body blocks ultraviolet light, providing long-lasting protection for photoresists and photosensitive reagents against light-induced degradation. The neck uses a PTFE corrosion-resistant sealing gasket, and the threaded cap fits tightly so it resists leakage and evaporation in long-term storage. Treated through a dedicated dust-free washing process with strict particle and metal ion leaching control, it will not disturb high-purity chemical test results. The simple, protrusion-free shape makes storage and stacking easy — suited to laboratory sampling, long-term light-protected retention of trace reagents, and small-batch chemical dispensing in cleanrooms.