4.1 Technical requirements should comply with the requirements of Appendix A, Appendix B, Appendix C, Appendix D and Appendix E. 4.2 The thickness should comply with the requirements in Table 1. Table 1 Thickness of dry-pressed ceramic tiles (unit: mm) Surface area S Thickness value S≤900 cm2 ≤10.0 900 cm2＜S≤1 800 cm2 ≤10.0 1 800 cm2＜S≤3 600 cm2 ≤10.0 3 600 cm2＜S≤ 6 400 cm2 ≤11.0 S >6 400 cm2 ≤13.5 4.3 The radionuclide limit should comply with the requirements for Class A decoration materials in GB 6566-2010.