A REACH O-ring is a type of sealing ring made from materials that comply with the European Union’s REACH regulation, which is a comprehensive regulation designed to ensure the safe use of chemicals in the EU.

Under REACH, manufacturers and importers of chemicals must register their substances with the European Chemicals Agency (ECHA), and provide detailed information on their properties, hazards, and safe use. REACH also includes restrictions and authorization requirements for certain chemicals that are deemed to be hazardous or otherwise pose a risk to human health or the environment.

REACH O-rings can be made from a variety of materials, including nitrile, fluoroelastomer, silicone, and other specialty elastomers. These materials are chosen for their compatibility with the application, as well as their performance characteristics, such as resistance to temperature, pressure, and chemical exposure.