0.25 mL Microcentrifuge Tubes, Conical Bottom, HDPE, Natural — 214-3712-02S | 1000/Bag | Caplugs® Evergreen

Quick Reference

Technical Narrative

The Caplugs® Evergreen 214-3712-02S is a 0.25 mL Conical Microcentrifuge Tube in LDPE (Natural), packaged 1000/Bag. The 0.25 mL format is the smallest LDPE conical micro tube, suited for ultra-micro-scale reactions, PCR setup, and sample dilutions where LDPE's flexibility and low-extractable profile are required at minimal volume. LDPE's defining characteristic versus HDPE, PP, and PPC is its softness and flexibility — the tube walls flex under moderate finger pressure, enabling tube-squeeze dispensing techniques and reducing brittle-fracture risk during cryogenic handling below —80°C.

Low-Density Polyethylene (LDPE): Exceptional flexibility and softness — LDPE walls flex under finger pressure, allowing tube contents to be expressed by squeezing, and the soft body reduces brittle-fracture risk at cryogenic temperatures. LDPE is softer and more flexible than HDPE; HDPE is harder with lower extractables. LDPE's flexibility is the primary selection criterion when the protocol requires tube compression or very cold handling. LDPE's flexibility and low extractables make it suitable for PCR prep, though HDPE is preferred for the most extractable-sensitive qPCR applications. BPA-free, phthalate-free, FDA-compliant,

Procurement economics: $48.24/Bag, $0.0483/tube. Volume pricing at 10+ bags. Siblings: 214-3714-020 (0.4 mL LDPE 1000/Bag); 214-3715-020 (0.5 mL LDPE 1000/Bag); 214-3417-020 (0.25 mL HDPE Tethered 1000/Bag). LabSupplies.com ships from USA inventory, typically same business day.

Technical Specifications

Conical Micro Tube (0.25 mL, LDPE) Compatible Workflows

The is compatible with the following laboratory workflows.

Chemical Resistance — Low-Density Polyethylene (LDPE)

Compatibility reference for LDPE at typical laboratory concentrations.

Clinical & Research Laboratory Applications

Caplugs® Evergreen 0.25 mL LDPE conical microcentrifuge tubes serve molecular biology, cryobiology, biochemistry, and forensic science laboratories requiring the flexibility and compressibility of LDPE in a standard conical micro tube format. 0.25 mL LDPE conical micro tubes serve molecular biology, forensic science, and cryobiology laboratories where LDPE's flexibility is a practical workflow advantage. The soft tube body enables squeeze-dispensing of micro-volume samples without a pipette — useful for dispensing viscous samples, transferring residual volumes from tube walls, and expressing complete contents from a micro tube into a reaction vessel. LDPE's flexibility at cryogenic temperatures (liquid nitrogen, —196°C) makes these tubes preferred over rigid HDPE or PP for samples stored in long-term liquid nitrogen cryopreservation.

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 tubes sterile?

No. The ships Non-Sterile. For sterility-critical applications, use aseptic technique or ask about gamma-sterilized options.

What is LDPE and how does it differ from HDPE and PP for micro tubes?

LDPE (Low-Density Polyethylene) has a lower polymer density and crystallinity than HDPE, producing a softer, more flexible tube body. LDPE walls flex under finger pressure — enabling squeeze-dispensing techniques — and remain flexible at cryogenic temperatures where HDPE and PP become more brittle. HDPE provides lower extractables (preferred for the most sensitive PCR assays) and higher rigidity. PP provides broader organic solvent compatibility. Choose LDPE when tube flexibility or cryogenic flexibility is the primary selection criterion.

What is the maximum temperature for LDPE micro tube incubation?

LDPE micro tubes are suitable for water bath and dry-block incubation up to approximately 60°C — similar to PS, and below PP's ~80°C limit. Do not autoclave LDPE tubes. For incubation above 60°C, use PP or PPC micro tubes. LDPE excels at the other extreme — its flexibility at cryogenic temperatures makes it preferable to HDPE and PP for liquid nitrogen storage.