This screw cap incorporates a pierceable septum made of chemically resistant PTFE on the outside and silicone on the inside, both components being stable over a broad range of temperatures. The septum also acts as a silicone o-ring for better sample protection.

• Made of polypropylene
• Autoclavable

It is especially made to fit and be used with all Micrew™ microcentrifuge tubes. The cap is pierceable with pipette tips as well as with syringe needles.