Both clear glass and amber glass are highly inert. Amber glass protects sensitive natural samples by avoiding exposure to UV rays. Vials are mainly used to inject samples from autosamplers. 2mL 8-425 vials are more commonly used, but are sold in multiple sizes. The autosampler needle penetrates the cap during injection and extracts the required sample fraction from the vial. aijiren is proud to offer numerous vials for chromatography applications.