1) Condenser type 1. It hardens by reaction with humidity in a room temperature. 2. It is easy to use and its operation efficiency is high. 3. It has a great climate resistance including heatproof and coldproof. 4. It has great electric characteristics. 5. It has great functionality and safety. 2) Additional type 1. It has a good hardening feature for inside (outer surface and inside are uniformly hardened by heating). 2. It can be hardened in a closed space, for it leaves no by-product from hardening. 3. Hardening speed can be controlled by temperature or reaction suppressing material.