Stopcock

Characteristics of a Glass Stopcock

The main characteristics of a borosilicate glass (polytetrafluoroethylene) stopcock are as follows:

Explanation:
Material:
The stopcock body is made of borosilicate glass 3.3, known for its high resistance to temperature, corrosion, and chemicals.
The stopcock key is made of PTFE, a self-lubricating material that eliminates the need for grease and ensures an excellent seal.

Design and Functionality:
Straight-bore: Allows direct flow of liquid or gas when the stopcock is open.
Two-way: Indicates the ability to control flow in two directions or to connect two sections of glassware.
PTFE Key: The key is interchangeable and has a threaded plastic retainer to hold it in place.
Leak-Proof: The keys and seats are ground for a perfect fit, ensuring a good seal, compliant with standards such as DIN 12540-1.

Use:
These stopcocks are commonly used in laboratories to control the flow of liquids or gases in glass apparatus such as burettes, separating funnels, or inert gas lines.
They are particularly suitable for applications requiring high chemical resistance and the absence of grease contamination.