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.
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.
