Robson Spherical Joints are intended to give flexibility to complicated assemblies of glassware and facilitate erection of such glassware.

In vacuum systems, they relieve stress which may otherwise cause leakage at the joints.

They are also useful under conditions where conical joints may be difficult to separate; for instance, if a viscous or resinous material is being used inside the system.

Joints conform to ISO 641 (BS 2761).