This you can check the national standard, there is a clear division of standards.

"White sugar" GB317-2006

1, white sugar is divided into four grades, respectively, refined grade, excellent grade, first class, second class

2, the division is not divided into the size of the particles, the refined grade has a large particles and small particles, the same second class has a large particles and small particles

3, the distinction between the four grades include the following: sucrose The distinction between the four grades includes the following: sucrose fraction (purity), reducing sugar fraction, conductive ash, loss on drying, color value, turbidity, insoluble impurities, sulfur dioxide (content) and so on.

4, the current market prices are based on a white sugar as a standard. Generally speaking, the refined grade is 600-800 yuan more expensive than the first grade, the superior grade is 300-500 yuan more expensive, the second grade is 20-100 yuan cheaper than the first grade