Autoclaved Sand Aerated Concrete or Autoclaved Ash Aerated Concrete?Have you ever bought the AAC products? Do you really understand AAC products? Generally speaking, AAC stands for autoclaved aerated concrete; and AAC also can be divided into two main products according to different raw materials, one is called autoclaved sand aerated concrete and the other is called autoclaved ash aerated concrete. Introduction of the Sand AAC. Introduction of the Ash AAC. The differences between sand AAC and ash AAC 1. Raw materials 2. Appearance color 3. Accuracy 4. Compressive strength 5. Dry shrinkage 6. Ingredient 7. Frost resistance 8. Toughness and brittleness 9. Environmental protection and energy consumption Overall, the sand AAC has better performance; and the Ash AAC is more economical.