10 mm Test Tube Stoppers — LDPE, Green, Plug-In Friction Fit | 1000/Bag (300-2910-G20)
These green Low-Density Polyethylene (LDPE) stopper caps provide a reliable plug-in friction-fit closure for standard 10 mm OD test tubes, including the common 10 × 75 mm format used across clinical chemistry, microbiology, and research workflows. Supplied non-sterile in a convenient 1000/Bag pack, part number 300-2910-G20 delivers high-volume tube closure at economical per-stopper pricing. LDPE's inherent flexibility maintains secure friction-fit retention through the full operating range of -20°C frozen archive storage to +60°C incubation, without hardening or losing engagement over repeated insertion and removal cycles.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number (MPN) | 300-2910-G20 |
| Cap Style | Stopper — Plug-In Friction Fit |
| Tube OD | 10 mm |
| Compatible Tube Format | Standard 10 × 75 mm test tubes |
| Material | Low-Density Polyethylene (LDPE) |
| Color | Green |
| Temperature Range | -20°C to +60°C |
| Sterility | Non-Sterile |
| Pack Size | 1000/Bag |
| BPA / Phthalates | BPA-free; no phthalate plasticizers |
| Country of Origin | USA |
Applications
- Microbiology culture tube capping: Seals TSB, BHI, LB broth, and other culture tubes during incubation; flexible LDPE fit is fully retained at 37°C
- Specimen tube archiving: Prevents evaporation of serum, plasma, and urine samples during extended refrigerated or frozen cold storage
- Clinical chemistry sample sealing: LDPE is chemically inert to serum and plasma matrices, making these stoppers suitable for pre-analysis tube closure without risk of leaching into the specimen
- Cell culture and virus propagation tubes: Provides a stopper closure for suspension cell culture and virus propagation workflows
- Pneumatic tube transport: LDPE flex retention maintains secure closure through the acceleration forces of clinical tube transport systems
- Color-coded specimen and batch routing: Green color differentiates stoppered tubes visually in racks, supporting specimen-type designation or batch-identity workflows without secondary labels
- Research reagent and buffer tube closure: Suitable for capping reusable glass and plastic tubes containing buffers, reagents, and stock solutions
Chemical Resistance
| Reagent / Condition | Compatibility |
|---|---|
| Aqueous buffers / saline | Excellent |
| Urine, serum, plasma | Excellent |
| Broth media (TSB, BHI, LB) | Excellent |
| Dilute acids and bases | Good |
| Alcohols and many organic solvents | Good — verify for prolonged contact |
| Chlorinated / aromatic solvents | Not recommended |
| Autoclaving | Not recommended |
Quality & Procurement
Made in USA, these Caplugs® Evergreen stopper caps are manufactured from BPA-free, phthalate-free LDPE resin. LabSupplies.com is an authorized dealer and ships from USA inventory, typically same business day for stocking items. Tiered pricing is available for high-volume clinical programs, institutional purchasing, and grant-funded laboratories.
Frequently Asked Questions
Will these stoppers fit any test tube, or only 10 × 75 mm tubes?
These stoppers are designed for standard 10 mm OD test tubes, including the common 10 × 75 mm format. Fit depends on the outer diameter of the tube mouth — verify your tube's OD is 10 mm before ordering, as tubes with different outer diameters require a different stopper size.
Can these stoppers be used for frozen specimen storage?
Yes. LDPE retains its flexible friction-fit engagement down to -20°C, so the stoppers maintain secure tube closure through freeze-thaw cycles without hardening or losing retention.
Are these stoppers sterile?
No — they are supplied non-sterile in 1000/Bag bulk packaging. For applications requiring sterile tube closure, a sterilization step appropriate to your workflow would need to be performed separately, noting that autoclaving is not recommended for LDPE.
Why choose green stoppers over natural or another color?
The green color enables visual differentiation of tube groups in loading racks, supporting color-coded specimen-type designation or batch-routing workflows without relying on secondary adhesive labels. If color coding is not required, the same 10 mm stopper is also available in natural (clear) LDPE.