19 mL Round-Bottom PP Test Tubes, 16 × 125 mm — Natural, Non-Sterile, 1000/Bag (214-2345-03N)
These 19 mL polypropylene round-bottom test tubes measure 16 × 125 mm and are supplied non-sterile in bulk (1000/Bag) for high-throughput laboratory workflows. Manufactured from BPA-free, FDA-compliant polypropylene, they deliver broader solvent compatibility and higher thermal stability than polystyrene equivalents, making them the preferred choice for organic-modifier reaction systems, SPE eluate collection, and enzyme kinetics assays that exceed the chemical limits of PS tubes. Part number 214-2345-03N is available through LabSupplies.com, an authorized Caplugs® Evergreen dealer shipping from USA stock.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 214-2345-03N |
| Capacity | 19 mL |
| Dimensions | 16 × 125 mm |
| Geometry | Round Bottom |
| Material | Polypropylene (PP) |
| Color | Natural |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Thermal Rating | Up to ~80°C |
| BPA / Phthalate / Latex | BPA-Free, Phthalate-Free, Latex-Free |
| Country of Origin | USA |
Applications
- SPE eluate collection: Full compatibility with acetonitrile and methanol eluents at the 10–19 mL collection scale under standard SPE manifolds
- Organic solvent reactions: Bench-scale reactions and incubations with organic co-solvent buffer systems that are incompatible with polystyrene tubes
- Enzyme kinetics: Water bath incubation up to ~80°C with organic modifier co-solvents; exceeds the ~60°C thermal limit of PS equivalents
- Reagent and calibrator preparation: Multi-day storage of broad-solvent reagent matrices at the 19 mL working volume
- Colorimetric assays: Adequate PP optical clarity supports visual monitoring and spectrophotometric reading in the 400–700 nm range
- Centrifugation: Round-bottom geometry seats correctly in standard 16 × 125 mm clinical centrifuge adapters
- Pharmaceutical method development: Protocols requiring expanded acid/base tolerance (pH 2–12) and organic-modifier compatibility beyond PS limits
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent — inert across pH 2–12 |
| Dilute acids (HCl, H₂SO₄, <10%) | Good — adequate for SPE wash steps and reaction media |
| Dilute bases (NaOH, <10%) | Excellent — preferred over PS for caustic reagents |
| Methanol / acetonitrile (<100%) | Excellent — full compatibility with organic modifier eluents |
| Alcohols (ethanol, isopropanol) | Good — short-term contact compatible |
| Chlorinated solvents (chloroform, DCM) | Not recommended |
| Aromatic solvents (toluene, xylene) | Not recommended |
Quality & Procurement
Made in USA from FDA-compliant, food-contact-grade polypropylene resin, these tubes are BPA-free, phthalate-free, and latex-free. Caplugs® Evergreen manufactures under ISO 9001 quality management, and the single-use format eliminates washing steps and cross-contamination risk between samples. LabSupplies.com is an authorized Caplugs® Evergreen dealer shipping from USA inventory, typically same business day for stocking items, with volume pricing available for institutional, clinical, and grant-funded laboratories ordering at quantity.
Frequently Asked Questions
What is the maximum temperature these tubes can handle?
Polypropylene is rated to approximately 80°C, making these tubes suitable for water bath incubations at temperatures that would deform or fail polystyrene equivalents, which are typically limited to around 60°C.
Can these tubes be used with acetonitrile or methanol eluents?
Yes — polypropylene offers full compatibility with acetonitrile and methanol at concentrations up to 100%, which is why this format is the standard choice for SPE eluate collection and organic-modifier reaction workflows where PS tubes are not appropriate.
Are these tubes sterile?
No — they are supplied non-sterile in 1000/Bag bulk packaging. This format is intended for chemical, analytical, and biochemical workflows where sterility is not required. Contact us if your application requires a sterile alternative.
What is the difference between these PP tubes and the PS 19 mL round-bottom tubes?
Both formats share the same 16 × 125 mm geometry and 19 mL capacity, but polypropylene provides significantly broader solvent compatibility (including organic modifiers and caustic bases), a higher thermal ceiling (~80°C vs. ~60°C for PS), and resistance across pH 2–12. Polystyrene is preferred only where optical clarity and lower cost are priorities and no organic solvents are involved.