CryoSure® Cryogenic Vial Screw Caps — HDPE, Dark Green, 1000/Bag (300-3900-DG2K)
These dark green HDPE screw caps are engineered specifically for CryoSure® cryogenic vials, providing reliable thread engagement and seal integrity across the full cryogenic range — from -80°C ultra-low temperature mechanical freezers through liquid nitrogen vapor phase and immersion storage at -196°C. Supplied in a 1000/Bag bulk format under the Caplugs® Evergreen CryoSure® sub-brand, part number 300-3900-DG2K, these caps are the procurement choice for high-volume biorepository programs that demand both thermal performance and cost-efficient scaling. The distinct dark green color differentiates these caps from standard green CryoSure® caps, enabling reliable visual routing of specialized cryo batches, specific collection events, or environmental archives within shared cryo box systems.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3900-DG2K |
| Sub-brand | CryoSure® (Caplugs® Evergreen) |
| Cap Style | Screw cap — CryoSure® cryogenic vial thread |
| Material | High-Density Polyethylene (HDPE) |
| Color | Dark Green |
| Cryogenic Rating | LN₂ vapor phase and immersion (-196°C) |
| Ultra-Low Temp Storage | -80°C compatible |
| Autoclave Compatibility | Yes — 121°C / 15 psi |
| Pack Size | 1000/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA (California) |
Applications
- Capping CryoSure® cryogenic vials for long-term liquid nitrogen vapor phase archive at -196°C
- Direct liquid nitrogen immersion storage of biobank specimens requiring reliable thread retention
- Ultra-low temperature (-80°C) mechanical freezer biorepository storage with full thread engagement through repeated freeze-thaw cycling
- Color-coded organization of blood, tissue, and cell line specimens across cryo box systems — dark green differentiates specialized batches, collection events, or environmental sample archives from standard green-coded vials
- Replacement capping of existing CryoSure® cryogenic vials requiring fresh caps for continued archive integrity
Compatibility
These caps are designed for use with CryoSure® cryogenic vials from Caplugs® Evergreen and thread onto the CryoSure® cryogenic vial thread geometry. Unlike standard HDPE tube caps in the 300-3010, 300-3532, and 300-3541 families — which are rated to -80°C — CryoSure® caps are engineered to withstand the extreme thermal contraction at liquid nitrogen temperatures that can fracture standard HDPE thread geometry and allow cryoprotectant evaporation over long-term LN₂ archive. Procurement teams replacing OEM caps on existing CryoSure® vial inventories will find the 1000/Bag bulk size offers strong per-cap economics; a 200/Bag trial size is also available for qualification testing before committing to full program volume.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| DMSO cryoprotectant (5–10%) | Compatible at standard biobank concentrations |
| Freezing media (FBS, glycerol, Bambanker) | Compatible |
| Standard biobank buffer formulations | Compatible |
| Dilute acids and bases | Good |
| Chlorinated / aromatic solvents | Not recommended |
| Liquid nitrogen (direct immersion) | Compatible — HDPE resists direct LN₂ liquid phase contact |
Quality & Procurement
Made in USA (California), CryoSure® caps are produced under the Caplugs® Evergreen quality system from BPA-free, phthalate-free HDPE resin. Autoclave compatibility at 121°C / 15 psi supports pre-sterilized cap supply workflows for GMP and regulated biobank environments. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with bulk and tiered pricing available for institutional biorepositories, clinical biobanks, and grant-funded research programs.
Frequently Asked Questions
What makes CryoSure® caps different from standard HDPE cryovial caps?
Standard HDPE tube caps in the Caplugs® Evergreen line are rated for -80°C ultra-low temperature storage. CryoSure® caps are specifically engineered to withstand the more extreme thermal contraction of liquid nitrogen temperatures (-196°C), which can fracture standard HDPE thread geometry and compromise the seal during long-term LN₂ vapor phase or immersion archive.
Are these caps compatible with any cryogenic vial brand, or only CryoSure® vials?
These caps are designed for CryoSure® cryogenic vials from Caplugs® Evergreen. Before substituting caps on vials from other manufacturers, verify that the thread geometry is identical — thread pitch and diameter differences between brands can compromise the cryogenic seal and risk specimen loss.
Can these caps be autoclaved for sterile biobank workflows?
Yes. The HDPE construction is autoclave-compatible at 121°C / 15 psi, making these caps suitable for pre-sterilized supply in GMP-adjacent and regulated biorepository environments.
Why choose dark green rather than standard green CryoSure® caps?
Dark green provides a visually distinct alternative to standard green within the CryoSure® color-coding system. Biobanks use this distinction to separate specialized cryo batches, unique collection events, or environmental sample archives from routine specimens stored under standard green caps — reducing picking errors in high-density cryo box storage without requiring labels or additional marking.