100–300 µL False Bottom Tube Screw Caps — HDPE, Natural, 1500/Bag (300-3008-020)
These High-Density Polyethylene (HDPE) screw caps feature an internal false bottom insert that raises the effective well floor of standard test tubes, reducing the minimum sample volume required for automated analyzer aspiration. Supplied non-sterile in 1500/Bag, they are engineered for micro-volume specimen conservation in pediatric, neonatal, and any clinical chemistry workflow where sample availability is severely limited. The threaded screw-cap closure delivers a secure, leak-resistant seal during centrifugation and refrigerated storage ahead of analysis.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3008-020 |
| Product Type | False Bottom Tube Screw Cap |
| Cap Style | Screw cap (threaded engagement) with internal false bottom insert |
| Material | High-Density Polyethylene (HDPE) |
| Color | Natural |
| False Bottom | Internal insert raises well floor to reduce aspiratable dead volume |
| Sample Volume Range | 100–300 µL |
| Autoclave Compatible | Yes — 121 °C / 15 psi (HDPE) |
| Sterility | Non-Sterile |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Pack Size | 1500/Bag |
| Country of Origin | USA |
Applications
- Neonatal and pediatric specimen processing: Heel-stick and fingerstick collections yield as little as 100–300 µL — the false bottom concentrates this micro-volume at the well floor so the analyzer probe can aspirate the complete sample without dead-volume loss.
- Automated analyzer dead-volume reduction: Clinical chemistry analyzers carry a fixed dead volume; the false bottom raises the tube's well floor to meet the probe at a much smaller total volume, eliminating wasted specimen.
- Serum and plasma micro-chemistry: Secure screw-cap closure withstands centrifugation for serum separation while protecting the micro-volume specimen from evaporation and contamination.
- Refrigerated pre-analysis storage: Leak-resistant threaded seal maintains sample integrity during short- and medium-term cold storage before the analytical run.
- High-volume laboratory programs: The 1500/Bag pack size suits high-throughput pediatric and neonatal chemistry programs requiring consistent per-cap economics at scale.
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers and saline | Excellent |
| Serum, plasma, and whole blood matrices | Excellent |
| Dilute acids and bases | Good |
| Alcohols (short-term contact) | Good |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Aromatic solvents (toluene, xylene) | Not recommended |
| Autoclaving (121 °C / 15 psi) | Compatible |
Quality & Procurement
Made in USA, these Caplugs® Evergreen false bottom screw caps are manufactured from FDA-compliant HDPE resin under ISO 9001 quality management, and are certified BPA-free and free of phthalate plasticizers — meeting the material-safety standards required for direct contact with clinical specimens. LabSupplies.com is an authorized Caplugs® Evergreen dealer, shipping from USA inventory with tiered volume pricing available for hospital systems, reference laboratories, and grant-funded research programs managing high-throughput pediatric specimen workflows.
Frequently Asked Questions
How does a false bottom cap reduce dead volume?
Standard test tubes have a fixed well depth; an auto-analyzer probe must have a minimum volume of liquid present before it can aspirate without drawing air — that minimum is the dead volume. The internal false bottom insert physically raises the floor of the tube, concentrating the specimen at a higher level so the probe can reach and aspirate the complete sample from a much smaller total volume, such as the 100–300 µL typically collected from neonatal heel-sticks or pediatric fingersticks.
Are these caps sterile?
No — part number 300-3008-020 is supplied non-sterile. Because HDPE is autoclave-compatible (121 °C / 15 psi), labs that require pre-sterilized caps can autoclave them in-house before use.
What tube formats do these screw caps fit?
The source data does not specify exact thread dimensions or compatible tube brands for these caps. Please contact LabSupplies.com with your tube manufacturer and thread specification to confirm fit before placing a high-volume order.
What pack size and ordering quantity is available?
These caps ship in bags of 1500 units. For institutional or contract purchasing programs requiring larger quantities or scheduled delivery, contact LabSupplies.com for volume pricing and blanket-order options.