SITREN AirVoid® 655 is a powdered air entrainer based on an amphoteric surfactant. It acts as a strong air-entraining agent for various cement based dry mortars such as renders and plasters. The airvoids have excellent stability that results in high freezing resistance and lower risk of efflorescence of the hardened mortar. In addition, SITREN AirVoid 655 enables faster wetting of the dry mortar particles and improves workability, the ability to trowel and flow ability of technical mortars.