DiamondPure 9mm Screw Caps for 2mL Chromatography Vials, Open-Top Blue with Bonded Red PTFE/White Silicone Septa, 100/Pack
The DiamondPure Screw Cap for 2mL Chromatography Vial seals standard 9mm-finish autosampler vials for reliable HPLC and GC sample storage. Its open-top design exposes a bonded red PTFE/white silicone septum, giving clean needle penetration for automated injection while limiting evaporation during overnight sequences.
Technical Specifications
| Product Type | Screw cap with bonded septum for 2mL chromatography vials |
| Volume/Size | 9mm finish (fits standard 2mL autosampler vials) |
| Material | Polypropylene cap; red PTFE / white silicone bonded septum |
| Closure/Cap | Screw closure, open-top blue cap |
| Sterility | Non-sterile |
| Pack Size | 100 caps per pack |
Available Options
| 9030002CAP-SC-BRW-S — Bag of 100 | 9030002CAP-SC-BRW-S | $31.20 |
| 9030002CAP-SC-BRW — Bag of 100 | 9030002CAP-SC-BRW | $31.20 |
Applications
- Sealing 2mL autosampler vials for HPLC and UHPLC runs
- GC and GC-MS sample preparation and overnight injection sequences
- LC-MS/MS bioanalytical and pharmaceutical assays
- Environmental sample storage prior to chromatographic analysis
- Forensic and toxicology screening workflows
- Stability and dissolution sampling in QC laboratories
Chemical Resistance
| Aqueous buffers | Excellent |
| Dilute acids | Excellent (PTFE face) |
| Dilute bases | Excellent (PTFE face) |
| Alcohols | Excellent |
| Acetonitrile | Good — limit prolonged exposure |
| Aromatic solvents | Good (PTFE side); silicone backing may swell on repeated contact |
| Chlorinated solvents | Good (PTFE side); avoid extended soaking |
Quality & Procurement
labsupplies.com is an authorized Globe Scientific dealer shipping from US inventory. Each pack carries lot numbers that support traceability for CAP-, CLIA-, and ISO 15189-accredited laboratories. Institutional and grant-funded tiered pricing is available — contact our team for volume quotes on standing chromatography supply orders.
Frequently Asked Questions
Which side of the septum should face the sample?
Orient the red PTFE layer toward the sample. PTFE offers broad chemical inertness, while the white silicone backing provides resealing and needle-guiding support after injection.
Are these caps pre-assembled with the septum?
Yes. The septum is bonded into the open-top blue cap, so no separate assembly is required before use on your 2mL vials.
What vial finish do these caps fit?
They fit standard 9mm-finish screw-thread 2mL chromatography and autosampler vials commonly used across HPLC and GC platforms.
Can the septum be re-pierced for multiple injections?
The silicone layer offers limited resealing for repeat injections, though we recommend single-puncture use for volatile samples to minimize evaporation and contamination.