Screw Caps for 20 mL Vials / 30 mL Centrifuge Tubes — HDPE, Yellow, 1000/Bag (300-3532-Y20)
These replacement screw caps are molded from high-density polyethylene (HDPE) and sized to fit 20 mL vials and 30 mL centrifuge tubes, providing a secure threaded closure for sample storage and transport. Supplied non-sterile in bulk bags of 1000, they are well suited to high-throughput labs that need reliable, color-coded closures at scale. The yellow color supports easy tube identification and lot differentiation across multiple sample sets.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-3532-Y20 |
| Compatible Vessel Size | 20 mL Vials / 30 mL Centrifuge Tubes |
| Closure Style | Screw Cap |
| Material | High-Density Polyethylene (HDPE) |
| Color | Yellow |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| Country of Origin | USA |
Applications
- Recapping 20 mL storage vials and 30 mL centrifuge tubes during sample archiving
- Color-coded tube management to distinguish sample groups, batches, or time points
- Bulk replacement of lost or damaged caps in high-throughput processing workflows
- Secure closure for aqueous buffers, biological specimens, and general liquid storage
- Specimen transport and short- to long-term refrigerated or frozen storage
Material & Chemical Resistance
High-density polyethylene offers broad general chemical resistance, performing well with aqueous solutions, dilute acids and bases, and many common laboratory reagents. HDPE is more rigid than low-density polyethylene and maintains its shape under typical laboratory handling conditions. Note that HDPE is not recommended for autoclaving, and compatibility should be verified before use with concentrated oxidizing acids, aromatic solvents, or halogenated solvents.
Quality & Procurement
Made in USA, Caplugs® Evergreen screw 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 — caps supplied under part number 300-3532-Y20 are non-sterile and packaged in bulk 1000/Bag for general laboratory and sample-management use. If sterility is required, consult our sterile closure options.
Can these caps be autoclaved?
HDPE is generally not recommended for autoclaving. For applications requiring sterilization, polypropylene closures are a better choice, as PP withstands standard autoclave cycles.
Will these caps fit any brand of 20 mL vial or 30 mL centrifuge tube?
These caps are designed for the standard thread finish used on 20 mL vials and 30 mL centrifuge tubes in the Caplugs® Evergreen line. Compatibility with tubes from other manufacturers depends on their specific thread dimensions; verifying fit before committing to bulk orders is advisable.