Sterile Two-Position Snap Caps for 12 mm PS Test Tubes — LDPE, Natural, 1000/Bag (222-3812-02S) These sterile Low-Density Polyethylene snap caps are designed to fit 12 mm outer-diameter polystyrene test tubes, providing a reliable two-position closure mechanism in a convenient 1000/Bag format. Position 1 delivers a vented (partial-open) configuration for gas exchange during incubation, centrifugation, or cell culture, while Position 2 provides a fully sealed closure for storage, transport, and aerosol containment. The inherent flexibility of LDPE enables the snap mechanism to engage consistently with PS tube wall tolerances. Technical Specifications Specification Value Part Number (MPN) 222-3812-02S Product Type Two-Position Snap Caps for 12 mm PS Test Tubes Cap Material Low-Density Polyethylene (LDPE) Color Natural Compatible Tube Diameter 12 mm OD Compatible Tube Material Polystyrene (PS) 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 in 12 mm PS tubes — vented position supports CO₂ exchange during incubation; closed position secures tubes for transport Centrifugation with pressure equalization — vented position prevents pressure buildup during spins in clinical or research centrifuges Serology agglutination panels — re-seal 12 mm PS tubes after initial reading to continue incubation steps Flow cytometry sample preparation — vented position during antibody staining incubations; closed position for acquisition on the instrument Bulk cap inventory for high-volume tube processing labs consuming caps at high daily rates Replacement cap supply for damaged or missing closures on 12 mm PS tube racks Chemical Resistance Reagent / Condition Compatibility Aqueous buffers / saline Excellent Cell culture media Excellent Ethanol (
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