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Our core calcium hydroxide product lines are engineered to meet the demanding requirements of paint, coating, and surface treatment manufacturers worldwide.
Pure Calcium Hydroxide — commonly known as slaked lime or hydrated lime — is a white, odorless, and highly alkaline inorganic compound with the chemical formula Ca(OH)₂. In the paint and coatings industry, it serves as a multifunctional raw material, delivering pH regulation, anti-corrosion properties, superior whiteness, and cost-effective functional performance.
With a purity level exceeding 95% and ultra-fine particle size distribution, industrial-grade pure calcium hydroxide integrates seamlessly into water-based paints, architectural coatings, industrial primers, and protective surface treatments. Its high surface area and reactive hydroxide groups make it an ideal functional additive for improving adhesion, durability, and long-term coating stability.
Pure Calcium Hydroxide (Ca(OH)₂) with ≥95% purity and D97 particle size <10μm delivers optimal dispersion, whiteness, and alkalinity control in modern paint formulations.
The global paint and coatings market surpassed USD 180 billion in 2023 and is projected to reach USD 260 billion by 2030, growing at a CAGR of approximately 5.2%. Within this expanding market, inorganic functional additives — especially high-purity calcium compounds — are experiencing accelerating demand driven by stricter environmental regulations, the shift toward water-based coatings, and rising infrastructure investment across Asia-Pacific, the Middle East, and Africa.
China remains the world's largest producer and consumer of calcium hydroxide, accounting for over 40% of global output. Leading manufacturers such as Shandong Useen Calcium Co., Ltd. are scaling production capacity and investing in precision processing technologies to meet the increasingly stringent specifications demanded by global coatings formulators.
The transition from solvent-based to water-based coating systems — accelerated by VOC emission regulations in Europe, North America, and China — is particularly favorable for calcium hydroxide, which functions as a natural pH buffer and alkalinity stabilizer in aqueous paint formulations.
Backed by world-class automated production infrastructure and decades of calcium chemistry expertise, we deliver consistent quality at scale.
Our pure calcium hydroxide is engineered to deliver measurable performance improvements across all major paint and coating formulation parameters.
Stringent manufacturing controls ensure minimal impurities, delivering consistent whiteness (GE brightness ≥92), superior opacity, and reliable batch-to-batch performance for premium coating formulations.
Precision milling achieves D50 <3μm and D97 <10μm, enabling excellent dispersion in waterborne systems, reduced settling, and smooth film formation with enhanced surface gloss.
The alkaline nature of Ca(OH)₂ passivates metal substrates, inhibiting rust formation. It is widely used in anti-corrosion primers for steel structures, bridges, and industrial equipment.
Calcium hydroxide is a naturally derived, non-toxic inorganic compound that integrates seamlessly into zero-VOC and low-VOC water-based coating systems, supporting green building certifications.
At optimized loading levels, pure calcium hydroxide contributes to paint viscosity and sag resistance, improving application properties for both brush and spray applications.
As a partial replacement for titanium dioxide (TiO₂), calcium hydroxide significantly reduces formulation costs while maintaining opacity and whiteness in architectural and decorative paints.
Pure calcium hydroxide plays a differentiated functional role across multiple paint and coating segments. Below is a detailed breakdown of its key application scenarios.
In interior and exterior wall paints, calcium hydroxide acts as a pH stabilizer and functional extender. Its high whiteness and fine particle size contribute to brightness, covering power, and resistance to mold and mildew due to its alkaline environment. It is especially effective in lime-based and mineral paints for heritage building restoration.
Pure calcium hydroxide is a critical component in anti-corrosion primers for steel, iron, and aluminum substrates. Its passivating alkalinity neutralizes acidic corrosion products, while its fine particle structure provides excellent adhesion to metal surfaces. Applications include offshore structures, pipelines, bridges, and industrial machinery.
In automotive primers and underbody coatings, calcium hydroxide contributes to corrosion inhibition and improves the adhesion of subsequent topcoat layers. It is used in electrocoating (e-coat) bath formulations as a pH control agent, ensuring stable deposition and uniform film thickness across complex automotive body geometries.
Marine coating systems require extreme durability against saltwater, UV exposure, and biofouling. Calcium hydroxide's strong alkalinity creates an inhospitable environment for marine organisms, making it a valuable additive in antifouling and protective coatings for ship hulls, offshore platforms, and port infrastructure.
Calcium hydroxide contributes to the thermal stability of intumescent coating systems. During a fire event, it participates in endothermic decomposition reactions that absorb heat and release water vapor, helping to delay flame spread and protect structural steel elements in commercial and industrial buildings.
As the coatings industry pivots toward sustainable formulations, calcium hydroxide is gaining traction in bio-based and natural paint systems. Its mineral origin, non-toxic profile, and compatibility with plant-based binders make it ideal for eco-label certified paints targeting LEED, BREEAM, and EU Ecolabel compliance.
Several macro and micro industry trends are reshaping the role of pure calcium hydroxide in global paint and coating production through 2030.
Tightening VOC regulations in the EU (Directive 2004/42/EC), the US EPA, and China's GB standards are accelerating the transition from solvent-borne to water-based systems. Calcium hydroxide's natural compatibility with aqueous formulations positions it as a preferred functional additive in this transition, offering pH buffering and stability without introducing organic solvents.
Rapid urbanization in Southeast Asia, India, and Sub-Saharan Africa is driving unprecedented demand for architectural and protective coatings. The Asia-Pacific coatings market is expected to grow at a CAGR of 6.1% through 2030, directly increasing consumption of cost-effective functional fillers like pure calcium hydroxide in large-volume paint production.
Advanced surface treatment technologies — including stearic acid coating and silane coupling agent modification — are enabling next-generation calcium hydroxide products with enhanced hydrophobicity, improved polymer compatibility, and superior dispersion in high-performance coating systems. Nano-scale calcium hydroxide (<100nm) is emerging as a premium additive for specialty coatings.
The development of self-healing, anti-bacterial, and photocatalytic coatings is creating new demand for calcium-based functional additives. Calcium hydroxide's ability to release hydroxide ions on demand makes it a candidate for pH-responsive smart coating systems that autonomously inhibit corrosion when a coating is breached.
Coatings manufacturers are under increasing pressure to demonstrate sustainable supply chains. Calcium hydroxide, derived from abundant natural limestone through well-established calcination and hydration processes, offers a verifiable, low-carbon-footprint raw material. Producers investing in renewable energy-powered kilns further reduce the carbon intensity of calcium hydroxide manufacturing.
Industry 4.0 technologies — including AI-driven process control, real-time particle size monitoring, and automated quality inspection — are being deployed in leading calcium hydroxide plants to achieve unprecedented consistency. This digital transformation enables manufacturers to meet the tightest specifications demanded by global coatings OEMs and formulators.
Shandong Useen Calcium Co., Ltd. specializes in a range of products, including nano-scale calcium carbonate, food-grade calcium carbonate, calcium oxide, calcium hydroxide, and light calcium carbonate. Our company owns 17 fully automated calcium oxide production lines, three calcium hydroxide production lines, and nine calcium carbonate production lines.
Its annual output is 200,000 tons for nano-calcium carbonate, 200,000 tons for calcium hydroxide, 160,000 tons for light calcium carbonate, 360,000 tons for heavy calcium carbonate, and 1 million tons for calcium oxide.
Our materials are used across a wide range of industries including PVC pipes, automotive primers, paper, printing inks, wires and cables, sealants, rubber products, tyres, and more. Our clients rely on us for consistency, tailored solutions, and support in scaling their operations without compromising on quality. Our company is the first in China to apply nano calcium carbonate to PE blow molding products, which can replace traditional filling materials and has excellent performance.
Innovation is at the core of everything we do. In recent years, we have made significant investments in R&D, focusing on the development of new technologies and next-generation calcium products. Our company has established close "industry-university-research" cooperation relationships with well-known foreign industry experts, the Institute of Process Engineering of the Chinese Academy of Sciences, Tsinghua University, China University of Geosciences, Beijing University of Science and Technology, Shandong University, etc.
Through our industry-university-research partnerships, we have established strong capabilities in applied research, product development, and advanced process engineering. These collaborations allow us to continuously evolve, improve our formulations, and meet the changing demands of global industries.
Our materials are used across a wide range of industries including PVC pipes, automotive primers, paper, printing inks, wires and cables, sealants, rubber products, tyres, and more. Our clients rely on us for consistency, tailored solutions, and support in scaling their operations without compromising on quality.
Our company is the first in China to apply nano calcium carbonate to PE blow molding products, which can replace traditional filling materials and has excellent performance.
Request a Quote TodayFrom calcium hydroxide to nano calcium carbonate, our comprehensive product portfolio supports every layer of the paint and coating production process.
