Funnel Separatory pear shape ISO4800, PTFE screw stopcock

ISO4800 Certified Pear Funnels with PTFE Stopcock Technology

You know those liquid-liquid extractions where you're separating phases and really can't afford any contamination? That's where these pear-shaped separatory funnels come in. Built to ISO4800 specs with PTFE screw stopcocks, they're what you'll reach for when standard Funnels just won't cut it for solvent work.

The pear shape isn't just aesthetic—it actually gives you better control when you're draining that lower phase. Borosilicate 3.3 glass handles thermal shock like a champ, and that PTFE stopcock? It'll stand up to pretty much anything you throw at it, from concentrated acids to aggressive organics.

PTFE Screw Stopcock Benefits for Chemical Compatibility

Here's why you'll appreciate the PTFE stopcock design over traditional glass options like Hollowed glass stoppers:

• Universal solvent resistance - works with chlorinated solvents, strong acids, and bases without degradation
• No grease needed - unlike glass-on-glass joints that seize up, PTFE stays smooth
• Precise flow control - the screw mechanism gives you way finer adjustment than plug-style stopcocks
• Longer lifespan - won't freeze or stick even after hundreds of extraction cycles

ISO4800 Manufacturing Standards Compliance

ISO4800 certification means these aren't just any separatory funnels—they meet strict international manufacturing specs. Wall thickness uniformity is controlled so you don't get weak spots that crack under vacuum. Dimensional accuracy ensures the ground glass joints mate properly with your Buchner Flask setups or other glassware. Available from 50ml to 2000ml capacities, each size maintains the same quality standards. When you're doing pharmaceutical QC or environmental testing, that consistency matters because you need reproducible results across different lab setups.

Precision Thread Design for Leak-Free Operation

The screw stopcock threading is machined to tight tolerances—you'll feel the difference when you turn it. Smooth, controlled rotation means you can crack it open just enough to collect a single drop for TLC analysis, then drain your organic layer without overshooting. The reinforced neck and spout handle the mechanical stress better than standard Separatory Funnel designs, especially important when you're working with full 1L or 2L volumes. Pro tip: always drain into a beaker first rather than directly into your collection flask—gives you a chance to catch any emulsion at the interface before it ruins your product.