The 4L photoresist drum is purpose-built for high-purity electronic chemicals such as semiconductor photoresists, formed in one piece from light yet high-strength 304 stainless steel. Acid pickling and passivation of the inner wall creates a dense protective layer that minimises metal ion leaching and prevents contamination of precision electronic materials. The brushed outer surface resists wear and fingerprints, suited to cleanroom cleanliness control. An integrated handle makes single-person handling easy, while the small-aperture sealed structure blocks light and air — a perfect match for photoresists' need for light protection and low contamination. It is a dedicated container for small-batch photoresist transfer and dispensing in laboratories and chip plants.