Advanced Chemical Technologies has been at the forefront of developing environmentally friendly silane-based protective products for concrete, masonry, and natural stone structures. SIL‑ACT® ATS‑300 is the latest development in this family of water repellent solutions. At less than 250 g/L, it is the lowest VOC content 100% silane product on the market, while maintaining the same water repellent characteristics our customers have come to expect. SIL-ACT® ATS‑300 remains easy to apply and has almost no odor.