Retort Rings & Boss Heads

A retort ring is a circular metal loop on a stem that mounts onto a stand rod, giving a flat support platform for a funnel during filtration or a wire gauze during heating.

A funnel in a support ring clamped to a retort stand

What is a retort ring or boss head?

A retort ring is a circular metal loop on a stem that mounts onto a stand rod, giving a flat support platform for a funnel during filtration or a wire gauze during heating. A boss head is the connector clamp that locks the ring's stem onto the vertical rod at a right angle.

SmartLabs stocks chrome-plated retort rings in a range of diameters, giving you a stable support platform for filtration, heating, and general glassware setups.

Common uses of retort rings and boss heads in the lab

Where a support ring holds glassware steady during an experiment.

  • A funnel in a support ring draining into a conical flask

    Filtration Support

    A retort ring holds a funnel steady above a flask, supporting gravity filtration as liquid drips through the filter paper.

  • A beaker on a wire gauze and support ring above a burner

    Wire Gauze Platform

    Topped with a square of wire gauze, a retort ring gives a flat-bottomed beaker a stable platform for even heating.

  • Close view of a boss head clamping a support ring to a stand

    Boss Head Connector

    The boss head's screw mechanism locks the ring's stem firmly onto the stand rod at a right angle.

  • A separating funnel and flask stacked on one retort stand

    Stacking Multiple Rings

    Two or more rings mounted at different heights on one rod can support several pieces of glassware in a single setup.