MST™ Flat-Top Cryogenic Vial Caps — HDPE, Orange, 200/Bag (300-3910-FE20)
These Caplugs® Evergreen MST™ flat-top cryogenic vial caps are made from high-density polyethylene (HDPE) and rated for liquid nitrogen vapor-phase and immersion storage at -196°C as well as -80°C mechanical freezer use. Supplied 200 caps per bag, the orange color serves as a universal lab convention for STAT and priority cryogenic specimens, enabling immediate visual identification in LN₂ cryo boxes and ultra-low-temperature racks. The flat-top cap profile is specific to MST™ cryogenic vials and is not interchangeable with CryoSure® dome-top vials or other vial formats.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FE20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Orange |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Freezer Storage | -80°C compatible |
| Autoclave Compatibility | 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 for LN₂ vapor-phase biobank archives at -196°C
- Ultra-low-temperature (-80°C) biorepository storage with reliable HDPE cryo stability through repeated freeze-thaw cycles
- Color-coded specimen routing — orange immediately flags STAT and priority samples in shared cryo boxes and storage racks
- High-density cryo box programs where the flat-top profile enables more consistent stacking than dome-top alternatives
- Automated robotic cap-on/cap-off systems that benefit from the flat profile's consistent engagement geometry
- Cell line cryopreservation in DMSO-containing cryoprotective media at standard concentrations
- Replacement cap supply for existing MST™ vial inventories where caps have been lost or damaged
Compatibility
These caps are engineered exclusively for MST™ cryogenic vials from Caplugs® Evergreen. The flat-top thread geometry differs from the dome-top profile used on CryoSure® vials, and the two systems are not interchangeable — MST™ caps will not correctly seat on CryoSure® vials, and CryoSure® dome-top caps are not a functional substitute here. If you are transitioning from OEM or other-brand cryogenic cap supply, validate fit with a sample bag before committing to a bulk purchase. The MST™ line spans 12 color designations, all in the same 200/Bag format, allowing labs to build a complete color-coded sample-management system within a single product family.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen — vapor phase and immersion (-196°C) | Excellent — engineered for LN₂ service |
| 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, these MST™ cryogenic caps are manufactured by Caplugs® Evergreen from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer and ships from USA inventory, with tiered volume pricing available for biobanks, hospital systems, and research institutions managing large cryogenic collections.
Frequently Asked Questions
Can these caps be used with CryoSure® cryogenic vials?
No. The MST™ flat-top thread profile is specific to MST™ cryogenic vials and is not compatible with CryoSure® vials, which use a dome-top cap geometry. Using the wrong cap can compromise the seal and risk sample loss — always match cap series to vial series.
Are these caps rated for liquid nitrogen immersion, or only vapor-phase storage?
Both. The 300-3910-FE20 HDPE caps are rated for LN₂ vapor-phase storage at -196°C as well as direct liquid nitrogen immersion, making them suitable for the full range of cryogenic biorepository formats.
Can these caps be autoclaved before use?
Yes — HDPE is autoclave-compatible at 121°C / 15 psi, so caps can be sterilized prior to use in sterile cell culture or biobanking workflows.
Why does color matter for cryogenic vial caps in a busy biobank?
Color coding provides instant visual triage in densely packed cryo boxes and -80°C racks where hundreds of vials may look identical. Orange is widely used to flag STAT and priority specimens, allowing retrieval staff to locate urgent samples without reading individual labels under difficult low-temperature conditions. The MST™ line offers 12 distinct colors so labs can build a comprehensive specimen-routing system.