Method for evaluating properties of plastic resin product

A method for evaluating properties of a plastic resin molded product, comprising the steps of:

• measuring length change compared to stress applied until a plastic resin specimen is cut, according to a published ASTM D638, to schematize a stress value to a strain value;
• confirming a minimum point and a second maximum point of the schematized measured values;
• calculating a spreading gradient value of the plastic resin specimen between the minimum point and the second maximum point;
• measuring complex modulus of elasticity of the plastic resin specimen;
• and
• comparing measured values of the plastic resin specimen with measured values of a standard specimen,
• wherein the plastic resin molded product satisfies Mathematical Equation 1:
• [Mathematical Equation 1]
• (X−a)2+(Y−b)2≤25
• wherein, in Mathematical Equation 1:
• X is the spreading gradient value of the plastic resin specimen, measured as a 10{circumflex over ( )}6 Pa/m unit,
• Y is the complex modulus of elasticity of the plastic resin specimen, measured as a 10{circumflex over ( )}8 Pa unit,
• a is a spreading gradient value of the standard specimen, and
• b is a complex modulus of elasticity value of the standard specimen.