Sterile Two-Position Snap Caps for 12 mm PP Test Tubes — LDPE, Natural, 1000/Bag (222-3812-02P) These sterile Low-Density Polyethylene snap caps are designed to fit 12 mm outer-diameter polypropylene test tubes, providing a reliable two-position closure mechanism in a 1000/Bag bulk supply format. Position 1 holds the cap partially open for gas exchange during incubation, culture, or centrifugation, while Position 2 delivers a fully sealed closure for storage, transport, and aerosol containment. The inherent flexibility of LDPE allows the snap mechanism to engage consistently with the dimensional tolerances of standard PP tube walls. Technical Specifications Specification Value Part Number (MPN) 222-3812-02P Product Type Two-Position Snap Caps Cap Material Low-Density Polyethylene (LDPE) Color Natural Compatible Tube Diameter 12 mm OD Compatible Tube Material Polypropylene (PP) Cap Positions Position 1: Vented (partial open); Position 2: Fully closed Sterility Sterile Pack Size 1000/Bag BPA / Phthalate / Latex BPA-Free, Phthalate-Free, Latex-Free Country of Origin USA Applications Cell culture: vented position (Position 1) permits CO₂ exchange during incubation; sealed position (Position 2) secures tubes for transport between the incubator and biosafety cabinet Centrifugation: vented position equalizes pressure during spins on 12 mm PP round-bottom tubes, reducing cap ejection and sample loss Flow cytometry sample preparation: vented closure during antibody incubation steps, then snapped fully closed before acquisition Serology and agglutination panels: re-seal 12 mm PP tubes after reading for continued incubation without aerosol risk Bulk cap inventory and replacement supply: high-volume labs processing large daily tube counts benefit from the 1000/Bag format and sterile assurance Chemical Resistance Reagent / Condition Compatibility Aqueous buffers / saline Excellent Cell culture media Excellent Dilute acids and bases Good Ethanol (
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