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Headspace (pressure release) caps.  
 
Reference Description Thickness Hardness SU Price
Pharma-Fix-Septum (Butyl/PTFE) 3.0 mm 50° 100
Butyl / PTFE 3.0 mm 50° 100
Silicone blue transp. * 3.0 mm 45° 100
Pharma-Fix-Septum / Silicon blue/PTFE grey (UltraClean)* 3.0 mm 45° 100
Silicone white/PTFE beige 3.2 mm 45° 100
Butyl, dark grey 3.0 mm 55° 100
* * Control by batch, Chromatograms available on request. For very critical GC analyses.  
 
 
 
 
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