Description_x000D_ General description_x000D_ Please note that the value stated on this page is nominal. All certified values for the current lots of all Paragon Silicone Rotational Viscosity Standards can be found on the Paragon Scientific webpage_x000D_ This product is a certified reference material (CRM) certified to International Standards BS EN ISO / IEC 17025 and ISO 17034 under UKAS accreditation.