Caplugs® Evergreen
Vial Caps, Tethered Caps, HDPE, White — 300-3918-TW20 | 200/Bag | Caplugs® Evergreen
Vial Caps, Tethered Caps, HDPE, White — 300-3918-TW20 | 200/Bag | Caplugs® Evergreen
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Tethered Recessed MST™ Cryogenic Vial Caps, HDPE, White — 300-3918-TW20 | 200/Bag
| Quick Reference — 300-3918-TW20 | |
|---|---|
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Tethered Recessed — cap stays on vial via flexible HDPE tether |
| Key Feature | Cap-loss prevention: tether prevents cap from leaving vial |
| Material | High-Density Polyethylene (HDPE) |
| Color | White |
| Cryo Rating | ✓ LN₂ vapor phase (-196°C) and immersion |
| Color Use | White tethered caps provide the highest-contrast surface for |
| Pack Size | 200/Bag |
| Price | $18.73 / Bag ($0.0937 / cap) |
Technical Narrative
The Caplugs® Evergreen MST™ is a white HDPE tethered recessed cryogenic vial cap for MST™ cryogenic vials — rated for LN₂ vapor phase (-196°C), LN₂ immersion, and -80°C storage. White tethered caps provide the highest-contrast surface for adhesive and LIS-printed barcode labels — the preferred choice for biorepository programs using label-based routing on tethered MST™ cryo vials. The flat label surface on the recessed top maximizes label adhesion area.
The tether eliminates cap loss during cryo vial retrieval — a meaningful advantage in high-density cryo box programs where loose caps create contamination and identification risks. All 5 tethered recessed colors are at $18.73/200-bag — $0.96/bag more than the non-tethered recessed format (300-3914, $17.77) for the cap-retention benefit.
At $18.73 per 200/Bag — $0.0937 per cap.
Technical Specifications — Caplugs® Evergreen
| Specification | Value |
|---|---|
| Part Number | |
| Caplugs Item # | 3003918TW20E1 |
| Sub-brand | MST™ (Caplugs® Evergreen) |
| Cap Profile | Tethered Recessed |
| Tether | Flexible HDPE tether — cap attached to vial after opening |
| Material | High-Density Polyethylene (HDPE) |
| Color | White |
| Cryo Rating | LN₂ vapor phase and immersion (-196°C) |
| Storage | ✓ -80°C and -196°C compatible |
| Autoclave | ✓ 121°C / 15 psi |
| Pack Size | 200/Bag |
| BPA/Phthalate | BPA-free; no phthalate plasticizers |
| Country of Origin | Made in U.S.A. (California) |
MST™ Tethered Recessed Cap Compatibility — White
Fits MST™ tethered cryo vials for:
| Application | Use / Storage | Notes |
|---|---|---|
| Cap-loss prevention | High-density cryo box retrieval | Tether keeps cap on vial — no loose caps |
| LN₂ vapor phase archive | -196°C biobank programs | HDPE tether and cap LN₂-rated |
| -80°C archive | ULT biorepository | HDPE cryo stability |
| STAT specimen retrieval | Urgent access from cryo archive | Tethered cap: open quickly, no cap tracking |
| Color-coded cryo routing | Multi-specimen cryo box programs | 5 tethered colors: Orange/Green/Lavender/White/Yellow |
| Automated cryo handling | Robotic cap-on/cap-off systems | Recessed profile for consistent robotic engagement |
| Cell line cryopreservation | DMSO-protected cell line archives | HDPE DMSO compatible |
MST™ tethered caps for MST™ tethered vials only.
Chemical Resistance — HDPE MST™ Cryogenic Grade
MST™ HDPE maintains integrity from +121°C autoclave through -196°C LN₂.
| Reagent / Condition | Compatibility |
|---|---|
| Liquid nitrogen (-196°C) | ✓ Engineered for LN₂ vapor + immersion |
| Storage at -80°C | ✓ Excellent |
| DMSO (cryo conc.) | ✓ Good — 5–10% |
| Aqueous cryoprotectants | ✓ Excellent |
| Autoclave (121°C) | ✓ Compatible |
| Concentrated organics | ✗ Not recommended |
Complete MST™ Tethered Recessed Range — 5 Colors
All 5 at $18.73/200-bag — tether keeps cap on vial after opening:
| Part Number | Color | Convention |
|---|---|---|
| 300-3918-TE20 | Orange | STAT / priority cryo batch |
| 300-3918-TG20 | Green | Specimen-type or batch designation |
| 300-3918-TL20 | Lavender | EDTA anticoagulant / lavender-top |
| White | High-contrast label surface | |
| 300-3918-TY20 | Yellow | SPS/ACD / CLSI yellow-top |
MST™ three-profile summary: Flat Top (300-3910, 12 colors, $19.78) · Recessed (300-3914, 3 colors, $17.77) · Tethered Recessed (300-3918, 5 colors, $18.73)
Laboratory Applications
MST™ serves biobank programs using MST™ tethered vials with white color-coded routing; high-density cryo box programs where cap-loss prevention is a workflow priority; and any MST™ tethered vial program at -196°C LN₂ or -80°C.
U.S. Manufacturing, Quality & Institutional Procurement
Every Caplugs® Evergreen lot is precision-molded at our California manufacturing facility. We supply reference laboratories, hospital systems, and federal procurement offices under institutional pricing programs. Request a free sample below to validate fit before committing to volume.
Frequently Asked Questions — Caplugs® Evergreen
What is the color convention for white MST™ tethered recessed caps?
White tethered caps provide the highest-contrast surface for adhesive and LIS-printed barcode labels — the preferred choice for biorepository programs using label-based routing on tethered MST™ cryo vials. The flat label surface on the recessed top maximizes label adhesion area. All 5 tethered recessed colors share identical HDPE cryo specification at $18.73/200-bag.
How does the tethered recessed cap prevent cap loss in cryo archives?
A flexible HDPE tether connects the cap to the vial neck. When you unscrew the cap, it remains physically attached to the vial rather than becoming a loose piece. In high-density LN₂ cryo boxes, a dropped cap can sink between vials, contaminate adjacent specimens, or become lost — the tether eliminates all three failure modes. The tether also speeds up urgent specimen retrieval: no need to track a loose cap while handling the vial.
Is the tethered recessed cap compatible with LN₂ immersion?
Yes. Both the cap and the HDPE tether are engineered for LN₂ vapor phase (-196°C) and direct LN₂ immersion. The tether maintains flexibility and structural integrity at cryogenic temperatures. MST™ tethered caps are for MST™ tethered vials only — not interchangeable with CryoSure® vials or non-tethered MST™ vial formats.
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