Glass Key Stopcock for Separatory & Dropping Funnel – Precision Lab Valve
The SGC LABS® Glass Key Stopcock for Separatory & Dropping Funnels
is individually ground from Borosilicate Glass 3.3 for a perfect
taper-fit with the funnel barrel. The precision-ground glass key plug ensures
smooth, stepless flow control without dripping — essential for accurate
liquid-liquid extraction and controlled reagent addition in organic chemistry labs.

Key Features

Material: Borosilicate Glass 3.3 – chemically resistant to acids, bases & solvents
Plug type: Precision ground tapered glass key
Fit: Standard taper interchangeable with separatory & dropping funnels
Seal type: Grease-compatible; provides vacuum-tight seal when lubricated
Bore: Available in 2mm and 4mm bore diameters
Autoclave-safe – can be sterilised up to 121°C
Suitable for use with organic solvents, acids, and aqueous solutions
Conforms to: ISO 4797, DIN 12244

Separatory Funnel vs Dropping Funnel – Stopcock Compatibility
Both separatory funnels (pear-shaped or cylindrical, used for
liquid-liquid extraction) and dropping funnels (used for controlled
addition of reagents) use the same standard glass key stopcock design.
SGC LABS stopcocks are interchangeable across both funnel types in matching barrel sizes.

Applications

Liquid-liquid extraction in separatory funnels
Controlled reagent addition via dropping funnels
Replacement stopcock for worn or broken funnel stopcocks
Organic chemistry synthesis labs
Pharmaceutical R&D and QC laboratories
University teaching labs

Ordering Guide
To order the correct stopcock, please specify:

Barrel outer diameter (measured at widest point of taper): 8mm, 10mm, 12mm, or 15mm
Bore diameter: 2mm (standard) or 4mm (wide bore)
Funnel type: Separatory (extraction) or Dropping (addition)

Custom sizes available on request. Contact SGC LABS® for bulk and OEM orders.

Why Choose SGC LABS®?
Every stopcock is individually ground and matched to its barrel plug —
ensuring smooth, binding-free rotation. Manufactured in Ambala, India and exported
to 40+ countries, SGC LABS® glassware meets stringent international quality
standards. Bulk quantities and custom sizes available for OEM and institutional buyers.