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Magnetic universal screw seals ND18, with septum.  
 
Reference Septa Thickness Hardness SU Price
Silicone white/ PTFE blue (UltraClean)* 1.5mm 55º 100
Silicone blue transparent/PTFE white (UltraClean)* 1.3mm 45º 100
Butyl red / PTFE grey 1.6mm 55º 100
Silicone white/PTFE red, pre-cut star * 1.5 mm 55° 100
* * Control by batch, Chromatograms available on request. For very critical GC analyses.  
 
 
 
 
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