CryoSure® Cryogenic Vial Screw Caps — HDPE, Red, 1000/Bag (300-3900-R2K)
These red High-Density Polyethylene screw caps from the Caplugs® Evergreen CryoSure® line are engineered for cryogenic vial archiving at temperatures ranging from -196°C liquid nitrogen immersion and vapor phase storage through -80°C mechanical freezer environments, and are also autoclavable at 121°C. Supplied in a 1000/Bag bulk format, part number 300-3900-R2K is the high-volume procurement choice for biobanks, clinical biorepositories, and cell biology programs that rely on red color-coding to designate serum-derived or other red-class cryogenic vial aliquots.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3900-R2K |
| Sub-brand | CryoSure® (Caplugs® Evergreen) |
| Product Type | Cryogenic Vial Screw Cap |
| Material | High-Density Polyethylene (HDPE) |
| Color | Red |
| Cryogenic Rating | LN₂ vapor phase and immersion (-196°C) |
| Freezer Storage | -80°C mechanical freezer compatible |
| Autoclave Compatibility | 121°C / 15 psi |
| Pack Size | 1000/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA (California) |
Applications
- Biobank and biorepository archiving of red color-designated cryogenic vial aliquots in LN₂ vapor phase or immersion storage
- Clinical laboratory serum sample cryopreservation, where red color-coding aligns with the CLSI H3 red-top serum convention for straightforward specimen identification
- Cell line cryopreservation using DMSO-based cryoprotective media at standard concentrations (5–10%)
- -80°C mechanical freezer biorepository programs requiring a color-coded multi-specimen cap system
- High-throughput programs using color-coded cryo box systems where consistent cap color reduces retrieval errors across 12 CryoSure® color designations
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen, immersion (-196°C) | Excellent — engineered for LN₂ vapor and immersion |
| Storage at -80°C | Excellent — HDPE cryo-toughened |
| Autoclave (121°C / 15 psi) | Compatible |
| DMSO (5–10% cryoprotectant concentration) | Good — standard cryo media concentrations |
| Aqueous cryoprotectants (FBS, glycerol, Bambanker) | Excellent |
| Aqueous buffers and saline | Excellent |
| Concentrated organic solvents | Not recommended |
Quality & Procurement
Made in USA at Caplugs® Evergreen's California manufacturing facility, every lot of CryoSure® caps is precision-molded from BPA-free, phthalate-free HDPE resin under ISO 9001 quality management. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory. The 1000/Bag bulk format of this cap offers the lowest per-cap cost in the red CryoSure® range; laboratories wishing to confirm fit and workflow routing before committing to bulk quantities may first order the companion 200/Bag trial pack (300-3900-R20). Tiered pricing is available for institutional, hospital system, and federally funded procurement programs.
Frequently Asked Questions
Are these caps rated for liquid nitrogen immersion, or only vapor phase?
Both. CryoSure® HDPE screw caps are rated for LN₂ vapor phase storage at -196°C as well as full LN₂ immersion, in addition to -80°C mechanical freezer archiving.
What vials do these caps fit?
These caps are designed for use with CryoSure® cryogenic vials. If you are using vials from another manufacturer, confirm thread compatibility before placing a bulk order — the 200/Bag trial pack (300-3900-R20) is available for fit verification.
Why are the caps red, and does the color have a functional meaning?
Red CryoSure® caps mirror the CLSI H3 red-top serum convention, making them the standard choice for programs that color-code serum-derived cryogenic vial aliquots. CryoSure® caps are available in 12 colors to support multi-specimen color-coded archiving systems.
Can these caps be autoclaved for sterile applications?
Yes — HDPE CryoSure® caps are compatible with standard autoclave cycles at 121°C / 15 psi, supporting workflows that require sterile cap inventory before cryogenic vial filling.