Spray dryer absorber (SDA) material. also known as spray dryer ash. is a byproduct of coal combustion and flue gas scrubbing processes that has self-cementing properties similar to those of class C fly ash. SDA material does not usually meet the existing standards for use as a pozzolan in Portland cement concrete due to its characteristically high sulfur content. https://halohealthcarers.shop/product-category/pain-management/