OPTIM-R should be described in specifications as:-
The insulation shall be Kingspan OPTIM-R ___ mm thick: comprising a rigid vacuum insulation panel with a microporous core which is evacuated, encased and sealed in a thin, gas-tight envelope, with a thermal conductivity of 0.007 W/m.K.
The product shall be manufactured under a management system certified to ISO 9001: 2015, ISO 14001: 2015, ISO 45001:2018 and ISO 50001: 2011, and installed in accordance with the instructions issued by Kingspan Insulation.