Screw Caps with Silicone Washer for External-Thread Sample Tubes (6030-6059), Polypropylene, 7 Colors, 1000/Case
The Screw Cap with Silicone Washer for Sample Tubes with External Threads seals Globe Scientific sample tubes #6030–6059 with a dependable leak barrier for sample archiving, aliquot storage, and biobanking. Color coding speeds rack identification and workflow segregation, while the integrated washer maintains closure integrity through freeze-thaw handling.
Technical Specifications
| Product Type | Screw cap with silicone washer (for external-thread tubes #6030–6059) |
| Volume/Size | Fits external-thread sample tubes #6030–6059 |
| Material | Polypropylene cap with silicone sealing washer |
| Closure/Cap | Screw cap, external-thread compatible |
| Graduation | Not applicable |
| Sterility | Non-sterile |
| Pack Size | 1000 caps per case |
Available Colors
| Color | SKU | Price (per case of 1000) |
| Yellow — Bag of 1000 | 6137Y | $308.20 |
| Red — Bag of 1000 | 6137R | $308.20 |
| Orange — Bag of 1000 | 6137N | $308.20 |
| Lilac — Bag of 1000 | 6137L | $308.20 |
| Green — Bag of 1000 | 6137G | $308.20 |
| Blue — Bag of 1000 | 6137B | $308.20 |
| Gray — Bag of 1000 | 6137A | $308.20 |
Applications
- Long-term sample archiving in freezer racks and storage boxes
- Color-coded aliquot organization by study, patient, or assay type
- Biobanking and biorepository specimen storage
- Secure sealing of buffers, reagents, and extracts for transport
- Serum, plasma, and DNA/RNA sample retention
- Quality-control retain sample programs requiring visual sorting
Chemical Resistance
| Reagent Class | Compatibility |
| Aqueous buffers | Excellent |
| Dilute acids | Good |
| Dilute bases | Good |
| Alcohols | Good |
| Acetonitrile | Limited |
| Aromatic solvents | Not recommended |
| Chlorinated solvents | Not recommended |
Quality & Procurement
Purchase from labsupplies.com, an authorized Globe Scientific dealer shipping from US inventory. Each case carries lot numbers supporting traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available for volume orders and standing requisitions.
Frequently Asked Questions
Which tubes do these caps fit?
These caps are designed for Globe Scientific sample tubes with external threads in the #6030–6059 series. Confirm your tube catalog number against that range before ordering.
Why is a silicone washer included?
The silicone washer compresses against the tube rim to form a tighter seal, reducing leakage and evaporation during storage, transport, and freeze-thaw cycles.
How many caps come in each pack?
Each unit ships as a case of 1000 caps at the listed per-case price. All seven colors are sold in the same 1000-count case format.
Are these caps suitable for cryogenic storage?
The polypropylene construction tolerates standard freezer storage. Verify the rated temperature range of your matched tube series for ultra-low or liquid-nitrogen applications.