Method of measuring thermal conductivity of honeycomb structure

A method for measurement of thermal conductivity of a honeycomb structure having an axial direction, two ends, and a plurality of through-holes surrounded by partition walls extending in the axial direction, the method comprising the steps of:

• contacting the two ends of the honeycomb structure with contact members;
• covering exposed sides of the honeycomb structure with heat-insulating material;
• keeping the whole honeycomb structure in a steady temperature state with keeping two ends of the honeycomb structure at given different temperatures;
• and
• measuring a thermal conductivity of the honeycomb structure in the steady state,
• wherein:
• the contact members are kept at given different temperatures and are contacted with the two ends of the honeycomb structure to keep the two ends of the honeycomb structure at given different temperatures;
• the two ends of the honeycomb structure and the contact members are contacted with each other via high-thermal-conductivity members;
• and
• each high-thermal-conductivity member is made of a film formed by applying a paste containing a substance of high thermal conductivity, on a contact face of the honeycomb structure and/or the contact member.