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Chase brand micro-hematocrit tubes are manufactured from soda lime glass, packed in plastic vials with reclosable snap-lock caps to maintain cleanliness. Ends may be sealed by flame, sealing clay or patented caps. They are available in borosilicate glass as a special order. Heparinized capillary tubes are treated to prevent blood clotting. Ammonium Heparin does not interfere with sodium identification. Chase brand plain or heparinized micro-hematocrit tubes may be purchased in bulk quantities. Call for quotes and minimums on plain or heparinized capillary tubes with no color coding.