MST™ Flat-Top Cryogenic Vial Caps — HDPE, White, 200/Bag (300-3910-FW20)
These Caplugs® Evergreen MST™ flat-top cryogenic vial caps are molded from high-density polyethylene (HDPE) in white and are rated for liquid nitrogen vapor phase and immersion storage down to -196°C as well as -80°C mechanical freezer environments. Supplied 200 caps per bag, part number 300-3910-FW20 is engineered exclusively for MST™ cryogenic vials — the flat-top profile is not interchangeable with CryoSure® dome-top caps or vials. White provides the highest-contrast surface in the MST™ color range for adhesive and LIS-printed barcode labels, making these caps a preferred choice in biorepository and biobank programs where flat-top label readability drives specimen routing.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FW20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | White |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Low-Temp Storage | -80°C and -196°C compatible |
| Autoclave Compatible | Yes — 121°C / 15 psi |
| Pack Size | 200/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA |
Applications
- Cryogenic vial capping for MST™ vials in LN₂ vapor-phase biobank archives at -196°C
- Ultra-low temperature (-80°C) biorepository storage of biological specimens
- High-contrast barcode labeling workflows where flat-top label readability is the primary specimen routing method
- High-density cryo box stacking programs where a flat-top profile improves storage density compared to dome-top caps
- Automated and robotic cryo vial handling systems requiring a consistent, flat cap engagement surface
- Color-coded multi-specimen cryo box organization across the 12-color MST™ cap range
- Replacement cap supply for existing MST™ cryogenic vial inventories
Compatibility
These MST™ flat-top caps are designed exclusively for MST™ cryogenic vials and use a thread and cap profile that is distinct from — and not interchangeable with — CryoSure® dome-top vials and caps. Always confirm you are matching MST™ caps to MST™ vials; the two series cannot be substituted for one another. If you are transitioning a biorepository program or replacing caps for an existing MST™ vial inventory, Caplugs® Evergreen offers all 12 MST™ colors in the same 200/Bag format so color-coded routing schemes can be maintained without interruption. When adopting these caps for a new workflow, validate fit with a sample lot before committing to bulk purchase.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen (-196°C), vapor phase and immersion | Excellent — engineered for LN₂ service |
| -80°C mechanical freezer storage | Excellent — HDPE cryo-toughened |
| Aqueous cryoprotectants (glycerol, sucrose solutions) | Excellent |
| DMSO at standard cryo concentrations (5–10%) | Good |
| Autoclave (121°C / 15 psi) | Compatible |
| Concentrated organic solvents | Not recommended |
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 the full MST™ color range and shipping from USA inventory. Tiered pricing is available for high-volume biorepository programs, institutional procurement offices, and grant-funded research laboratories.
Frequently Asked Questions
Will these caps fit CryoSure® cryogenic vials?
No. MST™ flat-top caps use a thread and cap profile specific to MST™ vials and are not interchangeable with CryoSure® dome-top vials or caps. Always match the cap series to the vial series, and validate fit with a sample before bulk purchase if you are unsure which vial series your lab uses.
Are these caps rated for liquid nitrogen immersion, or vapor phase only?
Both. The HDPE used in MST™ caps is rated for LN₂ vapor phase storage at -196°C as well as full LN₂ immersion, in addition to -80°C mechanical freezer environments.
Can these caps be autoclaved before use?
Yes — MST™ HDPE caps are autoclave-compatible at 121°C / 15 psi, supporting workflows that require sterile cap supply prior to specimen loading.
Why choose white caps over other colors in the MST™ range?
White offers the highest contrast surface in the 12-color MST™ range for both adhesive cryolabels and LIS-printed barcode labels, making it the preferred cap color in biorepository programs where flat-top label readability is the primary method of specimen identification and routing.