Cryo Vial Caps — HDPE, Lavender, Flat Top, MST™ (300-3910-FL20) | 200/Bag
These lavender high-density polyethylene (HDPE) flat-top cryogenic vial caps are part of the Caplugs® Evergreen MST™ line, supplied 200 per bag for high-throughput biobank and biorepository programs. Rated for liquid nitrogen vapor-phase and immersion service down to -196°C as well as -80°C mechanical freezer storage, part number 300-3910-FL20 is a purpose-built replacement and consumable cap for MST™ cryogenic vials. The lavender color mirrors the CLSI H3 lavender-top EDTA tube convention, making these caps the intuitive choice for designating EDTA-preserved specimens — including molecular panels, DNA banking, and whole blood aliquots — within color-coded cryo box programs.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FL20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Lavender |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Freezer Storage | -80°C compatible |
| Autoclavable | Yes — 121°C / 15 psi |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 200/Bag |
| Country of Origin | USA |
Applications
- Capping MST™ cryogenic vials in LN₂ vapor-phase biobank archives at -196°C
- Ultra-low temperature (-80°C) mechanical freezer biorepository storage with stable freeze-thaw cycling
- Color-coded specimen routing for EDTA-preserved biobank samples (molecular panels, DNA banking, whole blood aliquots) following the CLSI H3 lavender-top convention
- High-density cryo box programs where the flat-top profile improves box stacking efficiency versus dome-top caps
- Automated robotic cap-on/cap-off systems where the flat profile enables consistent, repeatable robotic engagement
- Cell line cryopreservation archives using DMSO-based cryoprotectant media
- Replacement cap supply for MST™ vial programs where caps have been lost or damaged
Compatibility
These flat-top MST™ caps are designed exclusively for Caplugs® Evergreen MST™ cryogenic vials. The MST™ flat-top profile and thread geometry are distinct from those of CryoSure® dome-top caps — the two cap lines are not interchangeable, and MST™ caps should not be used with CryoSure® vials or other vial formats. Laboratories transitioning from OEM MST™ cap supply or replacing worn caps in an active cryo box program should validate fit with a sample lot before committing to bulk purchase.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen (-196°C) | Excellent — engineered for LN₂ vapor and immersion |
| Storage at -80°C | Excellent — HDPE cryo-toughened through freeze-thaw cycling |
| DMSO (5–10% cryoprotectant concentrations) | Good — standard cryo media concentrations |
| Aqueous cryoprotectants (FBS, glycerol, Bambanker) | Excellent |
| Aqueous buffers / saline | Excellent |
| Autoclave (121°C / 15 psi) | Compatible |
| Concentrated organic solvents | Not recommended |
Quality & Procurement
Made in USA, these MST™ caps are manufactured under ISO 9001 quality management from BPA-free, phthalate-free HDPE resin. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, making it straightforward to maintain consistent cap supply across active biobank and biorepository programs. Tiered pricing is available for institutional, grant-funded, and high-volume procurement accounts.
Frequently Asked Questions
Will these caps fit my CryoSure® cryogenic vials?
No — the MST™ flat-top cap has a distinct thread geometry and profile that is specific to MST™ cryogenic vials. CryoSure® vials use a dome-top cap in a different format, and the two lines are not interchangeable. Always validate cap-to-vial fit with a sample before placing a bulk order.
Are these caps rated for liquid nitrogen immersion, or only vapor-phase storage?
These HDPE caps are rated for both LN₂ vapor-phase storage at -196°C and direct LN₂ immersion, as well as -80°C mechanical freezer service.
Can these caps be autoclaved before use?
Yes — HDPE is autoclave-compatible at standard 121°C / 15 psi cycles, so these caps can be sterilized prior to use in cell line cryopreservation or other applications requiring sterile technique.
Why lavender — is this color just aesthetic?
Lavender is a deliberate choice that mirrors the CLSI H3 lavender-top EDTA tube convention, providing an intuitive visual cue for EDTA-preserved biobank specimens such as molecular panels, DNA banking samples, and whole blood aliquots in color-coded cryo box programs.