20–25 µL Caps, Graduated, LDPE, Natural — 222-1590-02I | 400/Bag | Caplugs® Evergreen

Quick Reference

Technical Narrative

The Caplugs® Evergreen 222-1590-02I is a 3.5 mL Fine Tip Transfer Pipet, sterile, LDPE (Natural), 400/Bag individually packed. The fine tip narrows to a long, tapered point producing ~20 µL drops — approximately half the drop volume of the standard 45 µL format. This smaller drop size is specified for lateral flow immunochromatography assay sample loading, point-of-care test well dispensing, microtiter plate seeding, and any protocol where a 20–25 µL application volume is the target and standard-tip pipets over-deliver per squeeze.

Low-Density Polyethylene (LDPE): the defining material for transfer pipets — LDPE's flexibility provides progressive, controllable bulb compression for smooth aspirate and dispense with one hand. LDPE's low extractable profile is suited for direct contact with serum, plasma, whole blood, and biological reagents. Sterile individually packed, no autoclaving required. BPA-free, phthalate-free, FDA-compliant,

Procurement economics: $77.00/Bag, $0.1925/pipet. Full 222-15xx transfer pipet series: Standard (222-1577-02I, 45 µL, 500/Bag); Graduated (222-1580-02I, 40 µL, 500/Bag); Blood Bank (222-1585-02I, 40 µL, 500/Bag); Fine Tip (, 20 µL, 400/Bag); Long Stem (222-1595-02I, 40 µL, 400/Bag). LabSupplies.com ships from USA inventory, typically same business day.

Technical Specifications

3.5 mL Fine Tip Transfer Pipet Applications

The is suited to the following laboratory workflows where the fine tip tip geometry provides the key advantage.

Chemical Resistance — Low-Density Polyethylene (LDPE)

Compatibility reference for LDPE at typical laboratory conditions.

Clinical & Research Laboratory Applications

Caplugs® Evergreen 3.5 mL fine tip transfer pipets serve point-of-care testing, immunoassay, and molecular diagnostics laboratories requiring controlled small-volume dispensing in the ~20 µL range. Lateral flow immunoassay (LFA) and rapid diagnostic test (RDT) platforms specify sample application volumes of 15–25 µL — the standard transfer pipet over-delivers at 45 µL, while the fine tip's ~20 µL drop closely matches the target application volume. Immunochromatography test well dispensing for HIV, malaria, influenza, and SARS-CoV-2 RDT platforms use fine tip transfer pipets for single-drop specimen application. In research settings, fine tip pipets are used for microtiter plate seed dispensing, immunofluorescence spot preparation, and any micro-volume transfer where the standard tip's larger drop results in spillover or excess volume.

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 transfer pipets sterile?

Yes. Each pipet is individually sterile-packed. Sterility is maintained until the individual wrapper is opened. Single-use — discard after use.

What application requires a fine tip vs a standard tip transfer pipet?

Use the fine tip (20 µL drop) when the target application volume is 15–25 µL — lateral flow assay sample loading, POC test well dispensing, and microtiter plate seeding. Use the standard tip (45 µL drop) for general transfer where larger volumes per squeeze are acceptable. The fine tip provides approximately half the volume per squeeze of the standard.

Can LDPE transfer pipets be used with organic solvents?

LDPE is compatible with dilute aqueous reagents, serum, plasma, and standard biological matrices. Short-term contact with ethanol (<70%) or methanol (<50%) is generally acceptable. LDPE is not suitable for acetonitrile, acetone, dichloromethane, chloroform, or concentrated organic solvents — use glass or PTFE instruments for organic solvent transfer.