Definition: a kind of material can be caused by physical and chemical reaction volume expansion, the volume expansion can be applied to materials production, silent blasting and other fields.

Purpose: more common are the concrete expansion agent, expansive agent of refractory material and is mainly used for compensation in the process of material hardening contraction, prevent craze. In recent years, according to the material properties, but also developed a static blasting agent, mainly through the volume expansion of material damage to structures.

Expansive agent material is mainly used in production, more common are the concrete expansion agent and refractories expansion agent. Concrete and monolithic refractories hardening process, often because the contractile properties of the raw material itself cause craze. Cited the expansion agent is to introduce the quantitative volume expansion, compensation shrinkage value of material itself, to prevent the occurrence of shrinkage cracking material, affect the structure, function and appearance. Used widely in recent years, with composite materials research and development, expansion of materials also received attention, various industries are widely used in the material production and manufacturing.