A color tag is used for quick identification of the tube's internal diameter. Distinguishing the tube size by the tag instead of the coloring of its entire body significantly reduces the risk of contamination in a LC/MS analysis.
PEEK tubing is color-coded for quick identification of internal diameter. For greater visibility, choose the solid color coding, for greater chemical resistance and biocompatibility, choose the striped coding. Natural Color PEEK Tubing has tag to identify internal diameter.