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, with tiered pricing available for biobanks, research institutions, and hospital laboratory systems placing volume or recurring orders.
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.