Made from amber high-clarity glass with inherent light-blocking properties that screen ultraviolet light, properly protecting photoresists and photosensitive electronic reagents from photolytic degradation. An integrated side handle makes holding easier when dispensing and transferring, and the neck uses a PTFE sealing gasket that resists highly corrosive chemicals with excellent liquid-tight sealing. Each unit is ultra-clean washed to a high standard before dispatch, with extremely low particle and metal ion leaching that will not interfere with high-purity chemical testing — suited to long-term light-protected sample retention and reagent transfer in R&D laboratories and semiconductor workshops.