1. AQSIQ 2006. Chemical reagent-general method for the determination of density. National Standards of the People’s Republic of China. GB/T 611.
2. AQSIQ 2010a. Plastics - polyether polyols - part 3: determination of hydroxyl number. National Standards of the People’s Republic of China. GB/T 12008.3.
3. AQSIQ 2010b. Plastics. Polyether Polyols. Part 7: determination of viscosity. National Standards of the People’s Republic of China GB/T 12008.7.
4. AQSIQ 2016a. Plastics—aromatic isocyanates for use in the production of polyurethane—part 2: determination of hydrolysable chlorine. National Standards of the People’s Republic of China. GB/T 12009.2.
5. AQSIQ 2016b. Plastics—aromatic isocyanates for use in the roduction of polyurethane—part 4: determination of isocyanate content. National Standards of the People’s Republic of China. GB/T 12009 4.