MST™ Flat-Top Cryogenic Vial Caps — HDPE, Natural, 200/Bag (300-3910-F020)
These Caplugs® Evergreen MST™ flat-top cryogenic vial caps are manufactured from high-density polyethylene (HDPE) engineered for liquid nitrogen vapor-phase and immersion storage at –196°C, as well as –80°C ultra-low temperature mechanical freezers. Part number 300-3910-F020 supplies 200 natural-colored caps per bag and is designed exclusively for MST™ cryogenic vials — the flat-top profile is not interchangeable with the dome-top CryoSure® (300-3900 series) cap and vial format. The uniform flat surface improves stacking density in high-density cryo boxes and provides consistent cap engagement for robotic cap-on/cap-off systems.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-F020 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Natural |
| Cryo Rating | LN₂ vapor phase and immersion (–196°C) |
| ULT Freezer Compatible | –80°C |
| Autoclave Compatible | Yes — 121°C / 15 psi |
| BPA / Phthalates | BPA-free; phthalate-free |
| Pack Size | 200/Bag |
| Country of Origin | USA |
Applications
- Capping MST™ cryogenic vials for long-term biobank archiving in liquid nitrogen vapor-phase dewars at –196°C
- Ultra-low temperature biorepository storage with repeated –80°C freeze-thaw cycling
- High-density cryo box programs where the flat-top profile reduces inter-layer airspace and improves stacking efficiency compared with dome-top caps
- Automated robotic cryo vial handling systems requiring a uniform flat cap surface for consistent torque-tool cap-on/cap-off engagement
- General biospecimen preservation: cell lines, tissue biopsies, serum, plasma, and nucleic acid archives
Compatibility
These caps are designed exclusively for MST™ cryogenic vials in the Caplugs® Evergreen product family. The MST™ vial thread and flat-top cap geometry are specific to this format and are not interchangeable with CryoSure® dome-top caps (300-3900 series) or standard HDPE tube caps from other Caplugs® Evergreen families (e.g., 300-3010, 300-3532, 300-3541). If you are transitioning from CryoSure® vials to MST™ vials — or vice versa — the caps and vials must be matched within the same product family. Caplugs® Evergreen recommends validating cap-to-vial fit with a sample quantity before committing to a bulk purchase.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline / PBS | Excellent |
| Dilute acids and bases | Good |
| Alcohols (ethanol, isopropanol) | Good — short-term contact |
| DMSO (cryoprotectant) | Good — short-term contact; validate for extended exposure |
| Liquid nitrogen (LN₂) | Excellent — HDPE engineered for cryogenic temperatures |
| Chlorinated / aromatic solvents | Not recommended |
| Autoclaving (121°C / 15 psi) | Compatible |
Quality & Procurement
Made in USA, these MST™ cryogenic vial caps are produced by Caplugs® Evergreen from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer stocking 300-3910-F020 and the full 12-color MST™ cap range, with orders shipping from USA inventory. Tiered volume pricing is available for biobanks, clinical laboratories, and institutions purchasing under grant or blanket purchase agreements — contact our team for a quote.
Frequently Asked Questions
Can these caps be used with CryoSure® cryogenic vials?
No. MST™ flat-top caps have a different thread geometry and cap profile from CryoSure® dome-top caps (300-3900 series). The two formats are not interchangeable — MST™ caps must be paired with MST™ vials only.
Are these caps safe for liquid nitrogen immersion, or only vapor-phase storage?
These caps are rated for both LN₂ vapor-phase storage at –196°C and direct liquid nitrogen immersion. The HDPE material is specifically engineered to maintain integrity at cryogenic temperatures without becoming brittle or losing its seal.
Can the caps be autoclaved before use?
Yes — these HDPE flat-top caps are autoclave-compatible at 121°C / 15 psi, allowing sterilization prior to aliquoting sterile biospecimens or cell culture materials.
What other colors are available in the MST™ cap range?
The MST™ line includes 12 colors in total. Two colors — Chocolate (300-3910-FM20) and Amber (300-3910-FN20) — are exclusive to the MST™ range and are not available in the CryoSure® series. Amber and Black (300-3910-FZ20) both provide light attenuation for light-sensitive specimens. All colors share the same flat-top HDPE construction and cryogenic rating.