A dual-layer composite PE liner bag designed for use with 4L photoresist drums. Raw material cleanliness is strictly controlled, keeping fine particles and metal impurities at extremely low levels so photoresists and high-purity electronic solvents are not contaminated. Supplied with a sealing gasket, dust cover and clip components, it achieves fully sealed, light-blocking containment after filling, keeping out air and dust. The centred opening matches dedicated supply tubes for smooth, residue-free discharge, and single-use operation eliminates cross-contamination of the drum — suited to small-batch chemical dispensing and transfer in semiconductor cleanrooms.