Tartaric acid is a strong retarder in both cement and gypsum-based systems. When tartaric acid reacts with the mineral phases of the cement, calcium tartrate hydrate is formed, covering the cement particles, thus blocking the hydration. The L+ variety with anti-cake, is highly soluble and free flowing, allowing for easy dispersion in small dosages throughout the finished product. Tartaric acid is a strong retarder in gypsum-based systems. The L+ variety with anti-cake, is highly soluble and free flowing, allowing for easy dispersion in small dosages throughout the finished gypsum mix. The DL variant is also available in granular form.