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10mm screw seals, black, center hole, with septum.  
 
Reference Septa Thickness Hardness SU Price
PTFE red / Silicone white / PTFE red 1.0 mm 45° 100
Silicone white / PTFE beige 1.5 mm 45° 100
Silicone white / PTFE red (UltraClean)* 1.3 mm 45° 100
Natural Rubber / TEF 1.3 mm 60° 100
Silicone white / PTFE blue, with slit 1.5 mm 55° 100
Natural Rubber / TEF 1.3 mm 60° 100
* * Control by batch, Chromatograms available on request. For very critical GC analyses. ** Closed top  
 
 
 
 
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