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| Naturkautschuk /TEF | ||
| Application: | HPLC/GC | |
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• Standard quality for HPLC |
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| RedRubber / PTFE (synthetic rubber) | ||
| Application: | HPLC/GC | |
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• NEW standard quality for HPLC and GC |
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| Butyl (septa / stopper) | ||
| Application: | Headspace | |
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• In the absence of a PTFE coating, only for uncritical analyzes |
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| Pharma-Fix Septum Butyl / PTFE | ||
| Application: | GC/HPLC/Headspace | |
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• Specialty: Pharma-Fix washer only centric PTFE-coated butyl disc; The elastic butyl lying on the glass edge achieves a significantly better seal than the slippery surface of a completely laminated sealing disc |
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| (PTFE /) silicone / PTFE | ||
| Application: | GC/HPLC/Headspace | |
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• Silicone is the purest synthetic elastomer and is therefore used for critical analyzes |
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| Silicon / aluminum foil | ||
| Application: | Headspace | |
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• All chemical and physical properties, such as silicone / PTFE |
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| Pure PTFE septa | ||
| Application: | HPLC | |
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• Very inert, therefore also as a coating on most other sealing discs |
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Durometer (hardness of the septum)
Durometer is the hardness of a septum, expressed in ° shore. The higher the "shore" number, the harder the septum, the lower the "shore" number, the softer the septum. The softest sealing disc is 45 ° shore A and the hardest 70 ° shore A is hard. In addition to the thickness of the disc, the hardness is an important indicator, which septum is suitable for the penetration of a certain needles (sensitive needles, thin or thick needles, pointed or blunt needles, etc.).
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