Vacuum rings and seals play a critical role in compressors and UHV pumping. Choosing the right material is critical to ensure proper sealing. The key factors to look out for in material selection include permeability, modulus to deform into sealing surfaces, and outgassing from the rubber compound. Proper groove design is also very important. Sealing surfaces need proper roughness, flatness and surface finish. We provide vacuum rings which are solid and able to maintain their structure without cracks, holes, or weakening.