50 mL Centrifuge Tube Screw Caps — HDPE, Orange, 1000/Bag (300-3541-E20)
These replacement screw caps are designed to fit standard 50 mL centrifuge tubes, molded from high-density polyethylene (HDPE) in a bright orange color for easy visual identification. Supplied non-sterile in bulk (1000/Bag), they are well suited for high-volume laboratories that routinely replace or stock spare caps for sample storage and processing workflows. Part number 300-3541-E20 is available from LabSupplies.com as an authorized Caplugs® Evergreen dealer.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3541-E20 |
| Fits Tube Size | 50 mL Centrifuge Tubes |
| Closure Style | Screw Cap |
| Material | High-Density Polyethylene (HDPE) |
| Color | Orange |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Replacement or spare caps for 50 mL centrifuge tubes in clinical and research laboratories
- Color-coded sample organization and workflow differentiation using orange caps
- Sample storage and archiving where a secure screw closure is required
- High-throughput labs maintaining bulk cap inventory to reduce downtime
- General liquid containment during mixing, incubation, or transport of aqueous samples
Material & Chemical Resistance
High-density polyethylene (HDPE) provides good general chemical resistance, including compatibility with aqueous solutions, dilute acids and bases, and many common laboratory buffers and salts. HDPE is a rigid, durable material suitable for repeated handling; however, it is not recommended for use with aromatic or halogenated solvents, which can cause swelling or degradation. HDPE is not autoclavable — for applications requiring sterile closures, alternative sterilization methods such as gamma irradiation should be considered.
Quality & Procurement
Made in USA, Caplugs® Evergreen centrifuge tube caps are manufactured under ISO 9001 quality management from BPA-free, phthalate-free, latex-free resin. LabSupplies.com is an authorized dealer and ships from USA inventory, typically same business day for stocking items, with tiered pricing available for institutional and grant-funded laboratories.
Frequently Asked Questions
Are these screw caps sterile?
No — part number 300-3541-E20 is supplied non-sterile in 1000/Bag bulk packaging, which is appropriate for most general laboratory sample handling and storage applications where sterility of the cap is not required.
Can these caps be autoclaved?
HDPE is not autoclavable. Exposure to standard autoclave temperatures (121 °C) can cause deformation. If sterile closures are needed, consider gamma-irradiated alternatives or a compatible sterilization method that does not require high heat.
What chemical exposures are safe with HDPE caps?
HDPE performs well with aqueous samples, dilute acids and bases, and common biological buffers. Aromatic solvents (such as toluene or xylene) and halogenated solvents (such as chloroform or methylene chloride) are not recommended, as they can swell or degrade the material.