MST™ Flat-Top Cryogenic Vial Caps — HDPE, Yellow, 200/Bag (300-3910-FY20)
These yellow HDPE flat-top cryogenic vial caps from Caplugs® Evergreen's MST™ sub-brand are engineered for reliable sealing of MST™ cryogenic vials across the full range of biorepository storage conditions, including liquid nitrogen vapor phase and immersion at -196°C and ultra-low temperature mechanical freezers at -80°C. Supplied 200 per bag, the flat-top profile is distinct from the CryoSure® dome-top design, improving stacking density in cryo boxes and providing a consistent surface for robotic cap-handling systems. Yellow MST™ caps correspond to the CLSI H3 SPS/ACD color convention, designating blood culture and ACD-preserved cryogenic specimens in multi-color cryo box programs.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3910-FY20 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Flat Top |
| Material | High-Density Polyethylene (HDPE) |
| Color | Yellow |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Ultra-Low Temp Storage | -80°C compatible |
| Autoclave Compatibility | Compatible (121°C / 15 psi) |
| Pack Size | 200/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA |
Applications
- Long-term biobank archival in liquid nitrogen vapor phase (-196°C) and LN₂ immersion storage
- Ultra-low temperature (-80°C) mechanical freezer biorepository programs
- Color-coded multi-specimen cryo box organization using CLSI H3 SPS/ACD yellow convention for blood culture and ACD-preserved specimens
- High-density cryo box stacking programs where a flat-top cap profile reduces wasted vertical space versus dome-top designs
- Automated and robotic cryogenic vial handling systems that require a consistent flat cap surface for reliable engagement
- Replacement cap supply for MST™ cryogenic vials with lost or damaged caps
Compatibility
The 300-3910-FY20 is designed exclusively for MST™ cryogenic vials from Caplugs® Evergreen. The MST™ flat-top cap uses a thread geometry and profile that is specific to the MST™ vial series and is not interchangeable with CryoSure® vials, which use a dome-top cap with a different thread specification. If you are transitioning from CryoSure® caps or vials, verify fit with a sample lot before committing to bulk purchase. MST™ caps are available in 12 colors to support comprehensive color-coded cryo box programs across specimen types.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen (-196°C, vapor phase and immersion) | Excellent — engineered for LN₂ service |
| Ultra-low temperature storage (-80°C) | Excellent — HDPE cryo-toughened |
| Autoclave (121°C / 15 psi) | Compatible |
| Aqueous cryoprotectants | Excellent |
| DMSO (5–10% standard cryo media concentrations) | Good — short-term contact at standard cryo concentrations |
| Concentrated organic solvents | Not recommended |
Quality & Procurement
Made in USA, these MST™ cryogenic vial caps are manufactured by Caplugs® Evergreen under ISO 9001 quality management from BPA-free, phthalate-free HDPE resin. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered pricing available for biobank programs, clinical labs, and institutional procurement offices managing high-volume cryo vial supply.
Frequently Asked Questions
Are these caps compatible with CryoSure® cryogenic vials?
No — MST™ caps and CryoSure® caps use different thread geometries and cap profiles and are not interchangeable. Always match the cap series to the vial series, and validate fit with a sample before bulk purchase if you are uncertain of your vial brand.
Are these caps rated for liquid nitrogen immersion, or vapor phase only?
Both. The MST™ HDPE flat-top caps are rated for LN₂ vapor phase storage at -196°C as well as direct LN₂ immersion, in addition to -80°C mechanical freezer storage.
Can these caps be autoclaved?
Yes — HDPE MST™ caps are autoclave compatible at 121°C / 15 psi, making them suitable for workflows that require sterilization of caps prior to specimen collection or storage.
What does the yellow color designation indicate?
In MST™ cryo box programs, yellow corresponds to the CLSI H3 SPS/ACD color convention, typically used to designate blood culture and ACD-preserved cryogenic specimens. Using the 12-color MST™ system enables consistent visual routing of specimen types without relying solely on label-based identification.