That is, the finished product was left in an environment at 100??? C. for 2 hours, then observed and evaluated according to the following criteria: [0342] ???: Good, that is, there is no defect. [0343] x: Poor, that is, there are defects such as discoloration and deformation. [0344] (5) Resistance to Wearing [0345] The surface of the product was rubbed 10 times with steel wool #0000, and the surfa