Product Description
Easy needle penetration matters when autosampler syringes pierce the same type of cap all day. This 18 mm screw cap carries a thin-center PTFE/silicone septum that is easy to puncture while still sealing the vial for analysis. It is a practical choice for routine headspace and GC work.
This listing is for Wheaton catalog number W224321: Screw Cap with Thin Center PTFE/Silicone Septum, 18 mm, Case of 100. The PTFE face provides a chemically inert barrier toward the sample, and the silicone layer helps reseal after piercing. Simply thread the cap onto an 18 mm screw-thread vial; no crimping tool is needed. Caps are supplied 100 per case. LIGHT LABS supplies the complete DWK Life Sciences line, including Kimble, Wheaton and DURAN labware.
Key Features
- Thin center septum – Easy needle penetration.
- PTFE/silicone construction – Inert face with resealing backing.
- Screw-on closure – No crimper required.
- 18 mm size – Fits 18 mm screw-thread vials.
Specifications
| Catalog Number | W224321 |
| Brand | Wheaton (DWK Life Sciences) |
| Description | Screw Cap with Thin Center PTFE/Silicone Septum, 18 mm |
| Sold As | Case of 100 |
| Size | 18 mm |
| Closure type | Screw cap |
| Septum | Thin center PTFE/silicone |
Applications
- Headspace GC
- Autosampler vial sealing
- Volatile compound analysis
- Residual solvent testing