Filtration Cones, Natural Rubber

These natural rubber filtration cones support and seal a filter funnel or crucible in a vacuum filtration setup. Unlike smaller jointed glass adapters, these larger rubber cones bridge the gap between a wide, rimmed flask opening and the stem of a heavy Buchner funnel or crucible.

Specifications

• Material: Flexible, chemical-resistant natural rubber
• Colour: Black
• Design: A tapered, collar-like shape that stretches to fit different funnel stems.
• Function: It works as a gasket, sealing the gap between the glass funnel stem and the flask neck. This stops air leaks, so your vacuum pump can actually pull liquid through the filter.
• Brand: OMSONS
• Product of India

Common Uses

• Glass-to-glass protection: Stops the hard edge of a Buchner funnel chipping the neck of your flask.
• Versatility: Unlike a rigid glass adapter, one rubber cone can often take slightly different funnel stem sizes.
• Assembly: Seat the rubber cone in the flask neck, then sit your funnel in the rubber cone.

Recommendation: If your filtration involves harsh solvents (like those used in HPLC or organic synthesis), use silicone or Viton cones instead of natural rubber, as they resist a much wider range of chemicals.