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Calcium carbide powder (CaC₂) is a high-value industrial mineral that serves as a foundational raw material and processing agent in the global plastics and rubber manufacturing sectors. As a precursor to acetylene gas and a key calcium-delivery agent, it underpins the synthesis of vinyl chloride monomer (VCM) for PVC production, acts as a desulfurizing agent in polymer processing, and contributes to the performance enhancement of rubber compounding. Its chemistry is deeply embedded in the supply chain of modern materials science.
When calcium carbide reacts with water, it produces acetylene (C₂H₂) — the essential building block for PVC (polyvinyl chloride) via the acetylene-based VCM route. This pathway accounts for a significant portion of PVC production capacity in Asia, particularly in China, where coal-based acetylene chemistry remains commercially dominant. In rubber manufacturing, calcium carbide-derived compounds contribute to vulcanization chemistry, antioxidant systems, and processing aid formulations, enabling manufacturers to achieve superior tensile strength, elasticity, and durability.
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 — delivering world-class output capacity to serve global plastics and rubber manufacturers.
From PVC pipe extrusion to high-performance tyre compounds, calcium carbide powder and its derivative calcium-based materials play transformative roles across the full value chain of plastics and rubber manufacturing.
Calcium carbide-derived acetylene is the primary feedstock for VCM synthesis in the acetylene-based PVC production route. Calcium carbonate fillers derived from the same calcium chemistry are widely used in PVC pipe compounding to reduce cost, improve rigidity, and enhance processing stability. Our GCC and PCC products deliver optimal whiteness and particle size distribution for PVC applications.
In automotive rubber manufacturing, nano calcium carbonate derived from calcium carbide chemistry serves as a high-performance reinforcing filler in tyre sidewalls, engine mounts, seals, and gaskets. Its ultra-fine particle size (40–100 nm) improves tensile strength, tear resistance, and aging properties compared to conventional fillers, enabling lighter and longer-lasting automotive components.
Calcium carbonate is a critical filler in PVC and XLPE cable insulation and jacketing compounds. It improves flame retardancy, reduces smoke density, and lowers dielectric constant — all critical performance parameters for modern electrical infrastructure. Our surface-treated calcium carbonate products offer excellent dispersion and compatibility with polyolefin and PVC matrices.
In silicone, polyurethane, and MS-polymer sealants, nano calcium carbonate acts as both a reinforcing filler and a rheology modifier. Its surface-treated variants provide excellent thixotropy, prevent sagging, and improve adhesion to substrates. This makes it indispensable in construction, automotive assembly, and electronics encapsulation applications.
Calcium oxide (quicklime) — a direct product of calcium carbide processing — is used as a desiccant and acid scavenger in rubber compounding. It neutralizes HCl generated during PVC processing and controls moisture in moisture-sensitive rubber formulations. Calcium hydroxide is similarly used as an activator and co-agent in sulfur vulcanization systems for NR, SBR, and EPDM rubbers.
Useen is the first company in China to apply nano calcium carbonate to PE blow molding products — replacing traditional filling materials with a superior-performance, cost-effective alternative. This breakthrough application demonstrates how calcium-based chemistry is enabling the next generation of lightweight, recyclable plastic packaging and industrial containers.
The global plastics and rubber industry is undergoing a structural transformation driven by sustainability mandates, lightweighting imperatives, and advanced material performance requirements. These megatrends are reshaping demand for calcium carbide and calcium carbonate products.
PVC demand is surging across Southeast Asia, South Asia, and Africa, driven by urbanization, infrastructure investment, and construction activity. The acetylene-based PVC route — heavily dependent on calcium carbide — remains the dominant production pathway in China and is expanding in other coal-rich nations. Global PVC consumption is projected to exceed 60 million tonnes annually by 2030.
The shift from conventional carbon black and silica fillers to nano calcium carbonate in rubber compounding is accelerating. Nano CaCO₃ offers a superior surface-area-to-volume ratio, enabling better polymer-filler interaction, improved mechanical properties, and reduced compound density — critical for EV lightweighting and next-generation tyre performance standards.
As the plastics industry transitions toward bio-based and recycled polymers (rPET, bio-PE, PLA), calcium carbonate fillers are proving compatible with these new matrices, offering cost reduction and performance enhancement without compromising recyclability. Calcium carbide chemistry also supports the production of calcium-based flame retardants that replace halogenated alternatives.
China produces over 70% of the world's calcium carbide and is the leading exporter of calcium carbonate products to the global rubber and plastics industries. Shandong province, home to Useen Calcium, is a major production center with world-class infrastructure, logistics networks, and deep integration with downstream polymer manufacturers — ensuring competitive pricing and reliable supply chains.
The electric vehicle revolution is creating new demand for high-performance rubber compounds in battery seals, thermal management systems, and NVH (noise, vibration, harshness) components. Calcium carbonate-filled EPDM and silicone rubber formulations are at the forefront of this innovation, offering dielectric properties, heat resistance, and dimensional stability required for EV applications.
Calcium carbide and carbonate producers are investing heavily in Industry 4.0 technologies — automated quality control, AI-driven particle size optimization, and real-time process monitoring. Useen's 17 fully automated production lines exemplify this trend, ensuring consistent product quality, reduced waste, and faster response to customer specification changes.
Premium-grade limestone and calcium-bearing minerals are carefully selected and tested for purity, mineralogy, and trace element content before entering production.
High-temperature calcination in automated kilns converts limestone to calcium oxide with precise control over reactivity, surface area, and bulk density.
Controlled carbonation reactions produce nano and precipitated calcium carbonate with tailored crystal morphology, particle size, and surface chemistry for specific polymer applications.
Surface modification with stearic acid and coupling agents ensures optimal compatibility with polymer matrices. Every batch undergoes rigorous QC testing before dispatch.
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, and more.
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.
