National Scientific 20mm Headspace Septa

Septa for use with unlined 20mm crimp seals
Grouped product items
Product Name Part # Price Qty Image
20mm Septum, Black Natural Rubber, Unfaced, 100/pack NS-C402040
20mm Septum, Ivory PTFE/Red Rubber, 100/pack NS-C402034
20mm Stopper, Molded Gray Butyl, Locking Design, 1000/case NS-C402030
20mm Septum, Tan PTFE/White Silicone (PurePak), 100/pack NS-C402032
20mm Septum, Aluminum Foil/White High Temperature Silicone, 100/pack NS-C402037
20mm Septum, Gray PTFE/Black Butyl Rubber, Molded Pharma-fix, 100/pack NS-C402036

# PTFE/Red Rubber septa are resistant to coring and offer good resealing characteristics

# Gray Butyl is an economical septum for low temperature applications

# PTFE/Gray Butyl septum provides increased chemical resistance

# PTFE/Silicone septa offer excellent chemical resistance, resealing characteristics and low background

# Use Aluminum Foil/Silicone septa in extreme high temperature applications

# PurePak PTFE/Silicone septa are packed in glass jars to maintain purity up to the point of use