World Record Name: hardest thermal conductivity of the material: tungsten diselenide
World record holder: tungsten diselenide
World record areas: thermal hardest substance
World Record rules: the hardest thermal conductivity of the material
World record number: 20120300028
World Record valid: to record was broken up.
World Record Witness: No. 008 to Carrying the Flag Certification Division
World Records Source: World record library to Carrying the Flag
World Record Certification date: March 26, 2012
World Record Details:

Thermal conductivity of the hardest materials: tungsten diselenide. Thermal conductivity of the diamond 10 parts per million.