Abstract: This invention relates to a chemically unmodified hyaluronan product which has a high molecular weight of 9-25 million Daltons and a zero shear viscosity from 0.1 to 30 billion mPa s. This unique product is durable and at the same time viscoelastic, and perfectly compatible within the biocompatible materials, for instance, as a cartilage substitute and as an intervertebral disc. The invention also relates to a process for manufacturing of said product.