Omni Block utilizes locally quarried, abundant, readily available, indigenous raw materials with low embodied energy counts during the manufacture of the block units. The EPS inserts are made of UL listed non-toxic, chemically stable, CFC-free, VOC-free materials, and have an extremely low flame-spread. The block is a thermally efficient “whole wall” because it combines R-value, the effects of thermal mass, thermal lag, thermal damping, and air-tightness, which result in a passive solar technology. All block and insert material are 100 percent recyclable. There is zero formaldehyde content in any of the components. For more information, visit omniblock.com.