3.5 mL Fine Tip Transfer Pipets — Sterile, LDPE, Natural, ~20 µL Drop Size (222-1590-02I) — 400/Bag
These 3.5 mL sterile fine tip transfer pipets deliver approximately 20 µL per drop — roughly half the drop volume of a standard transfer pipet — making them the right tool whenever a conventional tip over-delivers per squeeze. Manufactured from flexible Low-Density Polyethylene (LDPE) and individually sterile-packed, part number 222-1590-02I is designed for lateral flow immunoassay loading, point-of-care test dispensing, and any bench protocol where a controlled 20–25 µL application volume is critical.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 222-1590-02I |
| Capacity | 3.5 mL |
| Tip Type | Fine Tip |
| Drop Size | ~20 µL per drop |
| Tip Detail | Elongated fine taper — approximately half the drop volume of standard transfer pipets |
| Material | Low-Density Polyethylene (LDPE) |
| Color | Natural |
| Sterility | Sterile — individually sterile-packed |
| Pack Size | 400/Bag |
| BPA / Phthalate / Latex | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
Applications
- Lateral flow immunoassay (LFA) loading: The ~20 µL drop closely matches the sample application volume specified for most rapid diagnostic test (RDT) sample pads, reducing the risk of under- or over-saturation.
- Immunochromatography and point-of-care test dispensing: The elongated fine taper allows accurate targeting of narrow test wells and strip device ports where a wider tip cannot seat properly.
- Microtiter plate seeding: Manual loading of 96-well plates benefits from the smaller drop format, which suits typical microtiter well volumes and helps prevent cross-contamination between adjacent wells.
- Urinalysis strip reading: Controlled small-volume urine drops onto reagent strips without overfilling the reactive zones.
- Immunofluorescence slide preparation: Precise antigen spot application to microscope slides where volume accuracy directly affects signal intensity and reproducibility.
- General micro-volume dispensing: Any protocol targeting a 20–25 µL application volume where standard transfer pipets consistently over-deliver.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers, saline, PBS | Excellent |
| Serum, plasma, whole blood, urine | Excellent |
| Dilute acids and bases | Good |
| Alcohols (ethanol, isopropanol) | Good — short-term contact |
| Aromatic solvents (toluene, xylene) | Not recommended |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Autoclaving | Not recommended — supplied sterile; autoclaving not required |
Quality & Procurement
Made in USA, these Caplugs® Evergreen transfer pipets are produced from FDA-compliant LDPE resin that is BPA-free, phthalate-free, and latex-free, ensuring a low-extractable profile suitable for direct contact with serum, plasma, whole blood, and biological reagents. Each pipet is individually sterile-packed, eliminating the need for autoclaving or additional processing steps before use. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, with same-business-day dispatch available for stocking quantities and volume pricing for institutional, clinical, and grant-funded laboratories.
Frequently Asked Questions
Are these transfer pipets sterile out of the bag?
Yes — every pipet in the 400/Bag pack is individually sterile-packed, so no autoclaving or additional sterilization is needed. Simply open the individual wrapper and use directly.
Why choose the fine tip format over a standard transfer pipet?
Standard transfer pipets typically deliver approximately 45 µL per drop. The fine tip's elongated taper produces roughly half that — about 20 µL — so protocols that specify a 20–25 µL application volume, such as lateral flow assay loading or microtiter plate seeding, receive the correct dose without the operator having to partially compress the bulb and estimate delivery.
What is LDPE and why is it used for transfer pipets?
Low-Density Polyethylene (LDPE) is the material of choice for disposable transfer pipets because its inherent flexibility allows smooth, progressive bulb compression with one hand, giving the user fine control over aspiration and dispensing speed. LDPE also has a low-extractable profile, making it compatible with sensitive biological samples such as serum, plasma, and whole blood.
How does this pipet relate to the rest of the Caplugs® Evergreen 222-15xx series?
The fine tip format (222-1590-02I, ~20 µL drop, 400/Bag) is one of five transfer pipet styles in the series. The series also includes a standard tip, a graduated style, a blood bank format, and a long-stem variant — all in LDPE — allowing labs to standardize on a single product family across multiple workflows while selecting the tip geometry and drop size best suited to each protocol.