![900-1]( "900-1")
![900-2 - 副本]( "900-2 - 副本")
![微信截图_20250730103843]( "微信截图_20250730103843")
Basic Product Information
Calcium oxide, with the chemical formula CaO, a molecular weight of 56.08 and a CAS number of 1305-78-8, is a common inorganic compound. It usually appears as a white to off-white powder or solid, is odorless, and has a relatively high melting point (2572°C) and boiling point (2850°C), with a density of 3.35g/cm³ in the solid state. In terms of chemical properties, calcium oxide is a typical basic oxide.
It reacts violently with water to form calcium hydroxide (known as slaked lime) and releases a large amount of heat. This process is called "slaking of lime", and the chemical equation is CaO + H₂O = Ca(OH)₂. In addition, it can react with acids (such as hydrochloric acid and sulfuric acid) to produce corresponding calcium salts and water. For example, it reacts with hydrochloric acid to form calcium chloride and water (CaO + 2HCl = CaCl₂ + H₂O). Under high-temperature conditions, it can also react with acidic oxides such as carbon dioxide and sulfur dioxide. For instance, it reacts with carbon dioxide to form calcium carbonate (CaO + CO₂ = CaCO₃). This property makes it commonly used to absorb acidic components in gases.
![39cfd6fbaed81aa9da267e926b5224c]( "39cfd6fbaed81aa9da267e926b5224c")
Strict Product Quality Testing We have built a fully independent in-house laboratory staffed with a team of experienced professional technical and high-tech testing talents. Supported by complete advanced testing instruments and standardized testing procedures, our lab carries out comprehensive testing work to strictly control product quality at all stages.
Throughout the whole production process, professional technical personnel conduct regular sampling and systematic testing of semi-finished and finished products. They continuously track production indicators, monitor product performance in real time and deliver timely quality feedback to the production workshop. Once any abnormal data is detected, corresponding adjustment measures will be implemented immediately to eliminate hidden quality risks.
Every procedure, ranging from raw material incoming inspection and raw material storage, processing and production, to finished product packaging and delivery, is subject to rigorous standardized inspection. Before shipment, every truckload of finished goods must complete a full set of quality tests. Only goods that fully meet internal quality specifications can be approved to leave the factory. This comprehensive quality management system effectively stabilizes product consistency and guarantees that the qualification rate of products supplied to customers consistently meets stringent industry and customized high standards.
PACKAGING & DELIVERY
![微信截图_20250611142359]( "微信截图_20250611142359")
Qualification Certifications
![未命名]( "未命名")
Own mines in Hubei
Changshu Hongyu Calcium owns independent limestone mines in Hubei Province, enabling integrated full industrial chain operations covering ore mining, calcination processing and finished product delivery. We have access to high-grade limestone resources with stable calcium content and controllable impurities such as iron and magnesium. Product purity, activity and whiteness of calcium oxide and calcium hydroxide are guaranteed from the raw material source. Consistent specifications across batches support customized production requirements including low-iron and high-purity grades.
Raw ore screening and deep processing are fully self-controlled. We can select ores targetedly and adjust product indicators flexibly according to clients’ standards. With over 40 years of experience in the calcium chemical industry, our mines adopt modern mining management systems. Supported by three production lines and a daily output of 600 tons, we continuously supply stable, cost-effective calcium products for customers at home and abroad.
Strict Product Quality Testing 
