Changshu Hongyu Calcium Industry Co., Ltd., founded in 1984, is a professional manufacturer specializing in lime and calcium-based materials with more than 40 years of experience in the industry.
The company is headquartered in Changshu, Jiangsu Province, with a second production base in Hubei Province, and owns a high-purity limestone mine that ensures a stable and reliable source of raw materials.
This vertical integration — from mining to finished products — allows Hongyu to maintain full control over quality and consistency.
Our main product lines include:
Calcium Oxide (CaO) — high-reactivity quicklime in lump, granular, and powder forms.
Calcium Hydroxide (Ca(OH)2) — produced by advanced wet-process technology, featuring high purity and excellent whiteness.
Calcium Carbonate (CaCO3) — including ground, coated, and nano calcium carbonate, as well as calcium sand and calcium pebbles for landscaping and architectural use.
With a daily production capacity of around 500 tons, Hongyu Calcium has established a complete industrial chain integrating mining, calcination, hydration, grinding, packaging, and testing.
All products are strictly inspected in-house and comply with SGS and ISO international quality standards.
Our modern laboratory is equipped with whiteness testers, laser particle-size analyzers, BET surface area instruments, and high-temperature furnaces, ensuring accurate testing of each production batch.
Thanks to this commitment to quality, Hongyu products are exported to more than 20 countries and regions, covering Southeast Asia, the Middle East, Europe, and Africa.
At Hongyu Calcium, we uphold the principles of "Quality First, Integrity Always" and are dedicated to offering our global partners not only reliable products but also tailored technical support and stable long-term supply solutions.
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