2–3 mL Test Tubes, Round Bottom, PP, Natural — 214-2309-030 | 1000/Bag | Caplugs® Evergreen

2–3 mL Round Bottom Test Tubes, 12 × 50 mm — Polypropylene, Natural, 1000/Bag

These 3.4 mL polypropylene round bottom test tubes measure 12 × 50 mm and are designed for the full range of bench chemistry, sample preparation, and incubation workflows where polystyrene falls short. Supplied non-sterile in a convenient 1000/Bag format, part number 214-2309-030 is the preferred choice when organic solvents, elevated temperatures, or wide pH ranges make PS tubes unsuitable. The 12 × 50 mm format provides a wider bore for easy pipette access and accommodates standard round-bottom tube racks, centrifuge adapters, and dry-block inserts.

Technical Specifications

Applications

• Organic solvent reactions and co-solvent incubations with acetonitrile or methanol — protocols where polystyrene tubes are not appropriate
• SPE eluate collection under solid-phase extraction columns or manifolds handling ACN and methanol fractions
• Water bath and dry-block incubation up to 80°C, leveraging PP's higher thermal tolerance compared to PS
• Enzyme kinetics assays that incorporate organic co-solvents in the buffer system
• Serial dilutions of solvent-containing samples in dilution racks, manual or automated
• Colorimetric assays and spectrophotometric readings in the 400–700 nm range, where PP optical clarity is sufficient
• Centrifugation for round-bottom pellet formation in standard 12 × 50 mm centrifuge adapters
• Pharmaceutical method development and sample preparation workflows requiring broad solvent compatibility

Chemical Resistance

Quality & Procurement

Made in USA from FDA-compliant, food-contact-grade polypropylene resin, these tubes are produced under ISO 9001 quality management and are BPA-free, phthalate-free, and latex-free. LabSupplies.com is an authorized dealer of Caplugs® Evergreen consumables and ships from USA inventory, typically the same business day for stocking items. Volume pricing is available for laboratories purchasing ten or more bags, making these tubes cost-effective for high-throughput sample preparation and method development programs.

Frequently Asked Questions

Can these tubes be used with acetonitrile or methanol?
Yes — polypropylene provides broad organic solvent compatibility, including full-concentration acetonitrile and methanol. This makes these tubes well suited for SPE eluate collection, organic co-solvent reactions, and pharmaceutical method development workflows where polystyrene tubes would be degraded or compromised.

What is the maximum temperature for these tubes?
Polypropylene is thermally stable for water bath and dry-block incubation up to 80°C, which exceeds the approximately 60°C practical limit of polystyrene. They should not be autoclaved for sterile applications, as sterilization validation data is not provided for this product.

Are these tubes sterile?
No — they are supplied non-sterile in 1000/Bag packaging. For workflows requiring sterile consumables, verify whether sterilization is needed before purchase.

Is there a polystyrene version of this tube available?
Yes. If your protocols are limited to aqueous samples and standard buffers, a polystyrene round bottom tube in the same 3.4 mL, 12 × 50 mm format is available from the Caplugs® Evergreen family. Ask your LabSupplies.com representative for the PS equivalent when placing your order.