PTFE Stirring Stopper, 29# With 31 mm Upper Diameter (CAT#: STEM-BC-3488-ZJF)

This 29# PTFE stirring stopper is designed for larger laboratory vessel openings. It provides a sealed guide for an electric or overhead stirring shaft. An embedded O-ring maintains enclosure integrity during mixing. The low-friction PTFE interface enables smooth and flexible rotation. The stopper resists deformation and repeated mechanical use. It withstands working temperatures up to 280°C. The material is resistant to strong acids, strong bases, and many organic solvents. It also remains tough at temperatures down to -196°C and offers a nonstick surface.

Specification: 29#
Upper diameter: 31 mm
Middle diameter: 29 mm
Lower diameter: 26.5 mm
Height: 50 mm
Material: PTFE
Seal: Embedded O-ring
Maximum stated working temperature: 280°C
Low-temperature performance: Retains stated 5% elongation at -196°C

Large 29# format
Reliable O-ring sealing
Smooth shaft rotation
Low surface friction
Broad solvent resistance
High- and low-temperature tolerance
Nonstick construction
Resistant to aging and weathering

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