Caplugs® Evergreen
Test Tubes, LDPE, Natural — 222-3817-02P | 1000/Bag | Caplugs® Evergreen
Test Tubes, LDPE, Natural — 222-3817-02P | 1000/Bag | Caplugs® Evergreen
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Quick Reference
| Part Number | 222-3817-02P |
|---|---|
| Product | Two-position snap caps for 17 mm PP test tubes |
| Cap Material | Low-Density Polyethylene (LDPE) |
| Color | Natural |
| Tube Diameter | 17 mm OD |
| Tube Material | PP (optimized fit for PP tube wall dimensions) |
| Cap Function | Two positions: vented (partial open) + fully closed |
| Pack Size | 1000/Bag |
| Sterility | Sterile |
| Origin | Made in USA |
| Price | $67.72/Bag ($0.0678/cap) |
Technical Narrative
The Caplugs® Evergreen 222-3817-02P provides Sterile LDPE Two-Position Snap Caps for 17 mm PP test tubes, 1000/Bag. These are bulk sterile cap supply for round-bottom and conical test tubes with 17 mm outer diameter in PP — compatible with the Caplugs Evergreen 222-series sterile test tubes that use the two-position snap cap closure. The two-position mechanism provides: Position 1 (vented) — partial open for gas exchange during centrifugation, incubation, or culture; Position 2 (closed) — fully sealed for storage, transport, and aerosol containment. LDPE's flexibility enables the snap mechanism to function reliably with PP's dimensional tolerances.
Low-Density Polyethylene (LDPE): flexible snap mechanism, broad chemical resistance, low extractables for biological contact. Sterile 1000/Bag — high-volume cap supply for bulk tube assembly or replacement cap inventory. BPA-free, phthalate-free,
Procurement economics: $67.72/Bag (1000 caps), $0.0678/cap. Size/material set: 222-3812-02P (12 mm PP tube snap caps 1000/Bag); 222-3812-02S (12 mm PS tube snap caps 1000/Bag). LabSupplies.com ships from USA inventory, typically same business day.
Technical Specifications
| Part Number | |
|---|---|
| Caplugs Item # | |
| Product | Two-position snap caps for 17 mm PP test tubes |
| Cap Material | Low-Density Polyethylene (LDPE) |
| Color | Natural |
| Tube Diameter | 17 mm OD |
| Tube Material | PP |
| Cap Positions | Position 1: vented (partial open); Position 2: fully closed |
| Sterility | Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalate | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
| Price | $67.72/Bag ($0.0678/cap) |
Two-Position Snap Cap (17 mm PP Tube) Applications
The snap cap is compatible with 17 mm OD PP round-bottom test tubes requiring a two-position vented/closed closure.
| Application | Setting / Configuration | Notes |
|---|---|---|
| Tube capping at bench | 17 mm PP round-bottom tube | Snap on for instant closure; two-position for vented use |
| Cell culture in tube | Incubator, vented position on 17mm PP | Vented: CO2 exchange during incubation; closed: transport |
| Centrifugation with venting | Clinical centrifuge, vented snap cap | Vented position equalizes pressure during centrifuge spin |
| Bulk cap inventory | High-volume tube processing lab | 1000/Bag for labs consuming caps at high daily rates |
| Replacement cap supply | Replace damaged caps on 17mm PP tubes | Sterile; exact material match for tube tolerance |
| Serology tube panel | 17mm PP tube agglutination panel | Snap cap re-seals after reading for incubation continuation |
| Flow cytometry prep | 17mm PP tube, vented during staining | Vented position during incubation steps; closed for reading |
Chemical Resistance — Low-Density Polyethylene (LDPE)
Compatibility reference for LDPE at typical laboratory conditions.
| Reagent / Condition | Compatibility | Notes |
|---|---|---|
| Aqueous buffers / saline | Excellent | LDPE inert across standard biological buffer pH range. |
| Cell culture media | Excellent | Standard biological contact matrix; low extractables. |
| Ethanol (<70%) | Good | Short-term compatible for standard staining solutions. |
| Methanol (<50%) | Good | Short-term compatible. |
| Acetonitrile | Limited | Avoid prolonged LDPE contact; LDPE for aqueous protocols. |
| Formalin (10%) | Excellent | Compatible with standard fixative for post-culture fixation. |
| Dichloromethane / chloroform | Not Compatible | Causes swelling; do not use. |
| Temperature | ~60°C max | LDPE: do not autoclave; sterile-packed single-use. |
Clinical & Research Laboratory Applications
Caplugs® Evergreen sterile LDPE two-position snap caps for 17 mm PP test tubes serve clinical serology, flow cytometry, cell biology, and microbiology laboratories requiring bulk sterile cap supply for their round-bottom PP tube inventory. The two-position snap cap is the standard closure for flow cytometry and serology tubes — used across the Caplugs Evergreen 222-series sterile round-bottom tubes and compatible with other manufacturers' 17 mm PP tubes. Labs standardize on separate 1000/Bag cap supply when: (1) they purchase tubes and caps independently for inventory flexibility; (2) they need replacement caps for tubes whose caps were damaged; (3) high daily cap consumption requires bulk economics not available in 25/Bag assembled formats. The PP vs PS material designation reflects the dimensional fit optimization — PP and PS 17 mm tubes have slightly different wall profiles, and the correctly specified cap provides the most reliable snap engagement and release for each tube material.
U.S. Manufacturing, Quality & Institutional Procurement
Caplugs® Evergreen products are manufactured in the United States under ISO 9001 quality management from FDA-compliant, food-contact-grade resins. BPA-free, phthalate-free, and latex-free, with material-disclosure documentation supporting CAP, CLIA, and ISO 15189 laboratory accreditation audits.
LabSupplies.com is an authorized dealer for the full Caplugs Evergreen catalog and ships directly from USA inventory — typically same business day for stocking SKUs. We offer below retail pricing on volume orders, tiered institutional and academic pricing, and direct support for grant-funded laboratories and government procurement channels. Lab managers and procurement officers can request a written quote or speak with a product specialist directly from our sales engineering team.
Frequently Asked Questions
Are the snap caps sterile?
Yes. Sterile — packed 1000/Bag.
Why is there a separate cap for PP tubes vs PS tubes?
PP and PS 17 mm tubes have slightly different wall thicknesses and outer diameter tolerances due to the different physical properties of the two materials. The snap cap's engagement mechanism is dimensionally optimized for each tube material — the PP-specified cap provides reliable snap engagement on PP tubes, and the PS-specified cap on PS tubes. Using a mismatched cap may result in loose fit, over-tightness, or unreliable position engagement.
What is the two-position snap cap mechanism?
Position 1 (vented/partially open): the cap is clicked to the first detent, leaving a small gap that allows gas exchange — used during CO2 incubation, aerobic culture, and centrifugation where pressure equalization is needed. Position 2 (fully closed): the cap clicks to a fully sealed position for sample storage, transport, and aerosol containment. LDPE's flexibility allows reliable engagement at both positions throughout the tube's use cycle.
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