MST™ Flat-Top Cryogenic Vial Caps — HDPE, Blue, 200/Bag (300-3910-FB20)
These Caplugs® Evergreen MST™ flat-top cryogenic vial caps are manufactured from high-density polyethylene (HDPE) and rated for LN₂ vapor-phase and immersion storage at -196°C as well as -80°C mechanical freezer use, making them a dependable choice for biobanking, cell line archives, and clinical specimen cryopreservation programs. Supplied in blue — mirroring the CLSI H3 blue-top sodium citrate convention for color-coded specimen organization — these caps are designed exclusively for MST™ cryogenic vials and are not interchangeable with CryoSure® or other vial formats. Each bag contains 200 caps, supporting high-throughput cryo box workflows where consistent cap supply is critical.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FB20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Blue |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Freezer Storage | -80°C compatible |
| Autoclave Compatibility | 121°C / 15 psi |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 200/Bag |
| Country of Origin | USA (California) |
Applications
- LN₂ vapor-phase biobank archiving at -196°C for long-term biological specimen storage
- Ultra-low temperature (-80°C) mechanical freezer biorepository programs with repeated freeze-thaw cycling
- DMSO-cryoprotected cell line cryopreservation in standard 5–10% cryo media formulations
- Color-coded multi-specimen cryo box organization using the 12-color MST™ cap system
- High-density flat-top cryo box stacking programs where dome-top caps would compromise box capacity
- Automated robotic cap-on/cap-off systems requiring a consistent flat-profile cap for reliable engagement
- Replacement cap supply for existing MST™ cryogenic vial inventories with lost or damaged caps
Compatibility
The MST™ flat-top profile is engineered specifically for MST™ cryogenic vials (Caplugs® Evergreen). The thread geometry and cap profile differ from CryoSure® dome-top caps, and the two lines are not interchangeable — MST™ caps must be used with MST™ vials only. For laboratories currently running CryoSure® vial programs, the correct replacement cap is the CryoSure® dome-top series. Procurement managers sourcing replacement caps for an existing MST™ program can confirm fit with a sample bag before committing to bulk orders. Part number 300-3910-FB20 covers the blue cap; the full MST™ range spans 12 colors — including the MST™-exclusive Chocolate and Amber — all supplied in the same 200/Bag format.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen — vapor phase and immersion (-196°C) | Excellent — engineered for cryogenic use |
| Mechanical freezer storage (-80°C) | Excellent — HDPE cryo-toughened |
| Autoclave (121°C / 15 psi) | Compatible |
| DMSO at standard cryo concentrations (5–10%) | Good |
| Aqueous cryoprotectants (FBS, glycerol, Bambanker) | Excellent |
| Aqueous buffers and saline | Excellent |
| Concentrated organic solvents | Not recommended |
Quality & Procurement
Made in USA (California), these MST™ caps are produced from BPA-free, phthalate-free HDPE resin under Caplugs® Evergreen's quality management program, ensuring material consistency from autoclave temperatures through LN₂ immersion. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory.
Frequently Asked Questions
Will these caps fit CryoSure® vials or other cryogenic vial brands?
No. The MST™ flat-top cap thread and profile are specific to MST™ cryogenic vials. CryoSure® vials use a different dome-top cap series, and the two are not interchangeable. Always validate fit with a sample before bulk purchasing replacement caps for an existing vial program.
Are these caps rated for liquid nitrogen immersion, or vapor phase only?
Both. MST™ HDPE caps are rated for LN₂ vapor-phase archiving at -196°C and for full LN₂ immersion, as well as -80°C mechanical freezer storage.
Can these caps be autoclaved for pre-sterilization before cryopreservation use?
Yes — HDPE is autoclave-compatible at 121°C / 15 psi, so these caps can be sterilized prior to use in cell line cryopreservation or other sterility-sensitive workflows.
Why are the caps blue, and does the color have a functional meaning?
Blue is included in the 12-color MST™ cap system to support color-coded specimen routing and cryo box organization. In clinical laboratory programs, blue mirrors the CLSI H3 blue-top sodium citrate convention, helping staff associate cap color with specimen type at a glance. The MST™ range also includes colors exclusive to the line — such as Chocolate and Amber — that are not found in standard OEM cap systems.
