Laboratory Glass Stopcocks Manufacturer, Suppliers and Exporter in India

Lab Glassware Manufacturer is leading Laboratory Glass Stopcocks Manufacturer,and supplier and Exporter in Amabla India

Stopcocks control the flow of liquid or gas through burettes and other glassware, and the Laboratory Glass Stopcocks category from Lab Glassware Manufacturer covers ground-glass key and PTFE key designs in straight-bore and needle-valve forms, with borosilicate bodies, fitted or as replacements. A glass key seals by a precise ground fit but needs a thin film of grease and can seize if left dry. A PTFE key is self-lubricating and resists more aggressive reagents, while a needle-valve design gives fine control for dropwise titration.

Last updated: October 2026.

Glass Key vs. PTFE Key Stopcocks: Which to Choose

A stopcock's key – the rotating plug that opens and closes the flow path – can be ground glass or PTFE, and the choice affects both maintenance and chemical compatibility. A glass key seals by a precision ground-glass fit against the stopcock barrel and typically needs a thin film of stopcock grease to turn smoothly and seal reliably; it offers excellent chemical resistance but can seize if left dry or unused for long periods. A PTFE key is self-lubricating, needs no grease, and resists a wider range of aggressive reagents, making it a common choice for laboratories running frequent titrations or handling corrosive solutions. Both key types are available in straight-bore and needle-valve configurations, and either fitted to a burette or supplied as a standalone stopcock.

Frequently Asked Questions

What is the difference between a glass key and a PTFE key stopcock?
A glass key seals by a precision ground-glass fit and typically needs stopcock grease, while a PTFE key is self-lubricating and needs no grease, offering broader chemical resistance for frequent or corrosive use.

What is a needle-valve stopcock?
It is a stopcock design that allows fine, precise control over flow rate, useful for slow or dropwise titration work rather than a simple fully-open or fully-closed straight-bore design.

Are these stopcocks sold separately from a burette?
Yes, Lab Glassware Manufacturer supplies stopcocks both fitted to a complete burette and as standalone replacement parts for burettes already in service.

What material are the stopcock bodies made from?
The stopcock bodies are manufactured from Borosilicate Glass, valued in laboratory glassware for its chemical resistance and dimensional stability.

Related Categories

Glass Stopcocks | Glassware Burette | Glass Burette | Laboratory Glass Joints

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Send the key type and quantity for the glass key or PTFE key stopcocks you need, fitted to a burette or as replacements, through our enquiry form.