magnesium hydroxide

Introduction to Magnesium Hydroxide: A Versatile Industrial Compound

Magnesium hydroxide, with the chemical formula Mg(OH)₂, is an inorganic compound that appears as a white, odorless, and non-toxic powder. It is naturally occurring as the mineral brucite and is widely produced synthetically for various industrial applications. This compound is renowned for its flame retardant properties, acid-neutralizing capabilities, and use in wastewater treatment. As a critical raw material in the construction, pharmaceutical, and environmental sectors, magnesium hydroxide serves as a safer alternative to aluminum hydroxide and other halogenated flame retardants. Its high thermal stability, low smoke emission, and non-corrosive nature make it indispensable in modern manufacturing. The global market for magnesium hydroxide has been steadily expanding, driven by increasing safety regulations and environmental awareness.

Top 10 Global Suppliers and Manufacturers of Magnesium Hydroxide

The global magnesium hydroxide market is dominated by a mix of multinational corporations and specialized chemical producers. These companies are recognized for their production capacity, quality control, and global distribution networks. Below is a ranking of the top 10 global suppliers based on annual production volume, revenue, and market influence.

Rango	Nomo de la kompanio	Headquarters	Annual Capacity (Metric Tons)	Key Products
1	Martin Marietta	Usono	250,000+	Flame retardant grade, industrial grade
2	RHI Magnesita	Austria	200,000+	Refractory grade, chemical grade
3	Kyowa Chemical Industry	Japanio	150,000+	High-purity Mg(OH)₂, pharmaceutical grade
4	Dead Sea Works (ICL Group)	Israel	120,000+	Flame retardant, water treatment
5	Ube Industries	Japanio	100,000+	Specialty chemicals, flame retardants
6	Qinghai Haifeng Magnesium Industry	Ĉinio	90,000+	Industrial grade, high-purity
7	Nedmag Industries	Netherlands	80,000+	High-purity Mg(OH)₂, food grade
8	Premier Magnesia	Usono	70,000+	Agricultural grade, industrial
9	Grecian Magnesite	Greece	60,000+	Natural brucite, calcined magnesia
10	Magnezit Group	Russia	50,000+	Refractory materials, chemical grade

Top 10 Magnesium Hydroxide Suppliers and Factories in China

China is the largest producer of magnesium hydroxide globally, leveraging abundant mineral resources and cost-effective manufacturing. The following list ranks the top 10 Chinese manufacturers based on output, export volume, and industry reputation.

Rango	Nomo de la kompanio	Location	Annual Capacity (Metric Tons)	Main Applications
1	Qinghai Haifeng Magnesium Industry Co., Ltd.	Qinghai	90,000+	Flame retardant, water treatment
2	Hebei Meishen Chemical Co., Ltd.	Hebei	80,000+	Industrial grade, construction
3	Shandong Sinocera Functional Material Co., Ltd.	Shandong	70,000+	High-purity, electronics
4	Liaoning Xinda Magnesium Industry Co., Ltd.	Liaoning	65,000+	Refractory, chemical
5	Zibo Tianheng Chemical Co., Ltd.	Shandong	60,000+	Flame retardant, rubber
6	Jiangsu Yinfeng Magnesium Industry Co., Ltd.	Ĝiangsuo	55,000+	Pharmaceutical, food grade
7	Hunan Magnesium Technology Co., Ltd.	Hunano	50,000+	Water treatment, agriculture
8	Yantai Qiyuan Chemical Co., Ltd.	Shandong	45,000+	Construction, plastics
9	Guangdong Xilong Chemical Co., Ltd.	Kuangtungo	40,000+	Industrial, environmental
10	Anhui Xinyuan Magnesium Industry Co., Ltd.	Anhui	35,000+	Flame retardant, ceramics

Global Supplier and Factory Profile Table with Contact Emails

For procurement professionals, direct contact information is essential. Below is a detailed table of key global suppliers, including their primary contact email addresses for inquiries.

Nomo de la kompanio	Lando	Product Grade	Kontakta retpoŝto	Website
Martin Marietta	Usono	Flame retardant, industrial	sales@martinmarietta.com	www.martinmarietta.com
RHI Magnesita	Austria	Refractory, chemical	info@rhimagnesita.com	www.rhimagnesita.com
Kyowa Chemical Industry	Japanio	High-purity, pharmaceutical	kyowa@kyowa-chem.co.jp	www.kyowa-chem.co.jp
Dead Sea Works (ICL)	Israel	Flame retardant, water treatment	dsw.sales@icl-group.com	www.icl-group.com
Ube Industries	Japanio	Specialty chemicals	info@ube.com	www.ube.com
Qinghai Haifeng Magnesium	Ĉinio	Industrial, high-purity	export@haifengmg.com	www.haifengmg.com
Nedmag Industries	Netherlands	High-purity, food grade	info@nedmag.com	www.nedmag.com
Premier Magnesia	Usono	Agricultural, industrial	sales@premiermagnesia.com	www.premiermagnesia.com
Grecian Magnesite	Greece	Natural brucite	info@grecianmagnesite.com	www.grecianmagnesite.com
Magnezit Group	Russia	Refractory, chemical	info@magnezit.com	www.magnezit.com

Key Factors to Consider When Selecting a Chinese Manufacturer

Choosing the right magnesium hydroxide manufacturer in China requires careful evaluation of several critical factors to ensure product quality, supply reliability, and cost efficiency.

Quality Certification: Verify that the manufacturer holds ISO 9001, ISO 14001, and relevant industry-specific certifications such as REACH or FDA for food-grade products. Request recent third-party lab test reports for purity, particle size, and heavy metal content.

Production Capacity and Scalability: Assess the factory’s annual output and ability to scale up for large orders. Factories with capacities above 50,000 metric tons per year are generally more reliable for bulk contracts.

Raw Material Sourcing: Chinese manufacturers often use locally mined brucite or synthetic processes. Ensure the raw material source is stable and traceable, especially for high-purity applications.

Export Experience: Look for companies with a proven track record in exporting to your region. Check their familiarity with international shipping, customs documentation, and packaging standards.

Technical Support: Leading manufacturers provide technical data sheets (TDS), material safety data sheets (MSDS), and application support. This is crucial for integrating magnesium hydroxide into your specific manufacturing process.

Why Buy from Chinese Manufacturers? Key Advantages

Purchasing magnesium hydroxide from Chinese suppliers offers several distinct benefits that drive global demand.

Cost Efficiency: Chinese manufacturers benefit from lower labor costs, abundant raw materials, and integrated supply chains. Prices for industrial-grade magnesium hydroxide from China are typically 20-30% lower than European or American counterparts.

Large Production Scale: China’s magnesium hydroxide industry is highly consolidated, with several factories exceeding 100,000 metric tons annual capacity. This scale ensures consistent supply even for very large orders.

Diverse Product Grades: Chinese suppliers offer a wide range of grades, from low-cost industrial to high-purity pharmaceutical and flame retardant grades. This flexibility allows buyers to source multiple specifications from a single supplier.

Innovation and Quality Improvement: In recent years, Chinese manufacturers have invested heavily in R&D, improving particle size control, surface treatment, and purity levels. Many now meet stringent international standards.

Logistics and Shipping: China’s major ports (Shanghai, Ningbo, Qingdao) provide efficient global shipping routes. Sea freight costs from China to Europe or North America are competitive, with typical transit times of 20-35 days.

How to Find Professional Magnesium Hydroxide Manufacturers in China

Locating reliable manufacturers in China requires a systematic approach combining online research, verification, and on-the-ground checks.

B2B-platformoj: Use established platforms like Alibaba, Made-in-China, and Global Sources. Filter suppliers by “Verified” status, years in business, and transaction history. Request samples before bulk orders.

Industry Trade Shows: Attend events such as China International Chemical Industry Fair (ICIF) in Shanghai or Chinaplas. These exhibitions provide direct access to factory representatives and product demonstrations.

Third-Party Inspection Services: Engage companies like SGS, Bureau Veritas, or TÜV Rheinland to conduct factory audits and product quality inspections. This reduces the risk of receiving substandard materials.

Government Trade Resources: Check the China Chamber of Commerce for Import and Export of Machinery and Electronic Products (CCCME) or local chemical industry associations for lists of reputable manufacturers.

Direct Factory Visits: If feasible, visit the factory in person. Assess production lines, quality control labs, and storage conditions. This is the most reliable way to verify capabilities.

Application Scenarios and Solutions for Magnesium Hydroxide

Magnesium hydroxide is used across diverse industries, each requiring specific product characteristics. Below are key applications and tailored solutions.

Flame Retardant in Plastics and Construction

In the construction sector, magnesium hydroxide is added to PVC, polypropylene, and cable compounds as a non-halogen flame retardant. It decomposes endothermically at 330°C, releasing water vapor and forming a protective magnesium oxide layer. Solution: Use surface-treated grades with particle sizes of 1-5 microns for optimal dispersion and mechanical properties.

Wastewater Treatment

Magnesium hydroxide acts as a pH adjuster and coagulant in industrial wastewater treatment. It neutralizes acidic effluents and precipitates heavy metals like nickel, copper, and zinc. Solution: Choose a slurry form (50-60% solids) for easy dosing and rapid reaction. Typical dosage is 0.5-2 kg per cubic meter of wastewater.

Pharmaceutical and Food Industry

As an antacid and laxative, magnesium hydroxide is used in over-the-counter medications. It also serves as a food additive (E528) for pH control. Solution: Source USP or FCC-grade material with heavy metal limits below 10 ppm and microbial counts within pharmacopoeia standards.

Refractory Materials

In steelmaking and glass production, magnesium hydroxide is calcined to produce magnesia (MgO) for refractory bricks. Solution: Use high-purity (98%+ Mg(OH)₂) with low silica and iron content for superior thermal resistance.

Frequently Asked Questions (10 FAQs)

1. What is the difference between magnesium hydroxide and aluminum hydroxide? Magnesium hydroxide decomposes at a higher temperature (330°C vs 200°C) and produces less smoke, making it safer for flame retardant applications.
2. Is magnesium hydroxide safe for human consumption? Yes, in regulated pharmaceutical and food grades, it is safe. It is commonly used as an antacid.
3. What is the typical particle size for flame retardant grade? Most flame retardant applications require a mean particle size of 1-5 microns. Surface treatment improves compatibility with polymers.
4. Can magnesium hydroxide be used in potable water treatment? Yes, it is approved for pH adjustment in drinking water, but must meet strict purity standards.
5. What is the shelf life of magnesium hydroxide powder? When stored in dry conditions, it has a shelf life of 2-3 years. Slurry forms should be used within 6 months.
6. How is magnesium hydroxide packaged for export? Common packaging includes 25 kg paper bags, 500 kg jumbo bags, and 1-ton bulk bags. Container liners are used for moisture protection.
7. What is the melting point of magnesium hydroxide? It decomposes before melting at approximately 350°C, releasing water vapor.
8. Is magnesium hydroxide biodegradable? It is not biodegradable but is environmentally benign as it naturally converts to magnesium carbonate over time.
9. What are the main impurities to check? Key impurities include calcium oxide, silica, iron oxide, and heavy metals (lead, cadmium, mercury).
10. Can magnesium hydroxide be used in agriculture? Yes, it is used as a soil amendment to correct magnesium deficiency and adjust soil pH.

Purchasing Considerations for Magnesium Hydroxide

When negotiating a purchase agreement, pay attention to the following critical aspects to avoid costly mistakes.

Specification Clarity: Define exact requirements for purity (typically 93-99.5%), particle size distribution (D50, D90), moisture content (below 1%), and bulk density. Include these in the contract.

Minimum Order Quantity (MOQ): Chinese factories often set MOQs of 10-20 metric tons for standard grades. Specialty grades may require higher MOQs. Negotiate trial orders for new suppliers.

Payment Terms: Standard terms are 30% advance payment with 70% against copy of shipping documents. For established relationships, consider L/C at sight or open account terms.

Lead Time: Typical production lead time is 15-30 days after order confirmation. Factor in shipping time (20-35 days by sea) when planning inventory.

Quality Assurance Clause: Include provisions for third-party inspection at the factory before shipment. Specify penalties for off-spec material, such as price reduction or replacement.

Product Pricing Overview for Magnesium Hydroxide

Prices vary significantly based on grade, purity, and quantity. The following table provides indicative price ranges for bulk orders (FOB China main ports).

Grade	Purity (Mg(OH)₂ %)	Particle Size (D50, µm)	Price Range (USD per Metric Ton)
Industrial Grade	93-95%	10-50	$250 – $400
Flame Retardant Grade	96-98%	1-5	$500 – $800
High-Purity Grade	99.0-99.5%	1-10	$800 – $1,200
Pharmaceutical Grade (USP)	99.5%+	5-20	$1,500 – $2,500
Slurry (60% solids)	60% suspension	N/A	$150 – $250 per ton of slurry

Note: Prices are subject to fluctuation based on raw material costs, energy prices, and global demand. Always request a current quotation.

Industry Standards for Magnesium Hydroxide

Compliance with international standards ensures product quality and safety. Key standards include:

• ISO 9001:2015 – Quality management systems for manufacturing.
• ISO 14001:2015 – Environmental management systems.
• ASTM D5374 – Standard test methods for magnesium hydroxide used as a flame retardant.
• USP-NF – United States Pharmacopeia for pharmaceutical grades.
• FCC (Food Chemicals Codex) – For food additive grades.
• GB/T 19001-2016 – Chinese national standard equivalent to ISO 9001.
• REACH Regulation – EU regulation for chemical safety, applicable to exports to Europe.

Top 5 Global Import and Export Regions for Magnesium Hydroxide

International trade in magnesium hydroxide is concentrated in specific regions. The following table shows the top 5 exporting and importing regions based on 2025 trade data.

Rango	Exporting Region	Export Volume (Metric Tons/Year)	Importing Region	Import Volume (Metric Tons/Year)
1	Ĉinio	450,000	Europe (EU)	280,000
2	Usono	180,000	Nordameriko (Usono, Kanado)	200,000
3	Israel	120,000	Southeast Asia	150,000
4	Japanio	90,000	Middle East	80,000
5	Netherlands	70,000	South America	60,000

Google Search Commercial Keywords: 10 FAQ Questions and Answers

These questions target commercial search intent for buyers researching magnesium hydroxide.

1. Where to buy magnesium hydroxide in bulk? Major suppliers include Martin Marietta (USA), Qinghai Haifeng (China), and ICL Group (Israel). B2B platforms like Alibaba list verified bulk sellers.
2. What is the price of magnesium hydroxide per ton in 2026? Prices range from $250/ton for industrial grade to $2,500/ton for pharmaceutical grade, depending on purity and quantity.
3. Which magnesium hydroxide manufacturer has the best quality? Kyowa Chemical (Japan) and Nedmag (Netherlands) are renowned for high-purity grades. Chinese manufacturers like Shandong Sinocera offer competitive quality at lower prices.
4. How to find a reliable magnesium hydroxide supplier in China? Use Alibaba with “Verified” filter, request samples, and hire third-party inspection services like SGS for factory audits.
5. What is the minimum order quantity for magnesium hydroxide? MOQs typically range from 10-20 metric tons for standard grades. Specialty grades may require 5 tons minimum.
6. Is magnesium hydroxide better than aluminum hydroxide for flame retardants? Yes, magnesium hydroxide has higher decomposition temperature (330°C vs 200°C) and produces less smoke, making it safer for construction materials.
7. Can I get a free sample of magnesium hydroxide? Many Chinese manufacturers offer free samples of up to 1 kg, but you pay for shipping. Request via Alibaba or direct email.
8. What certifications should a magnesium hydroxide supplier have? Look for ISO 9001, ISO 14001, REACH registration, and specific grade certifications like USP or FCC.
9. How long does shipping take from China to the USA? Sea freight from Shanghai to Los Angeles takes approximately 20-25 days. Air freight is 5-7 days but costs significantly more.
10. What is the difference between light and heavy magnesium hydroxide? Light grade has lower bulk density (0.3-0.5 g/cm³) and is used in pharmaceuticals. Heavy grade (0.7-1.0 g/cm³) is preferred for industrial applications.

Customs Data and Tariff Rates for Magnesium Hydroxide

Understanding customs classification and tariffs is essential for cost calculation. The HS code for magnesium hydroxide is 2816.10.00 (Magnesium hydroxide and peroxide). Below are typical tariff rates for key importing regions.

Importing Country/Region	HS Code	Tariff Rate (MFN)	Additional Duties	Notes
European Union	2816.10.00	5.5%	VAT (20% average)	REACH registration required
United States	2816.10.00	3.7%	Section 301 tariff (25% for Chinese origin)	Check for exclusions
India	2816.10.00	10%	IGST (18%)	BIS certification may apply
Japanio	2816.10.00	0% (under EPA)	Consumption tax (10%)	Preferential rate for EPA partners
Brazil	2816.10.00	12%	IPI (10-15%)	Import license required

Note: Tariff rates are subject to change. Always consult a customs broker for current rates.

Why Choose Small and Medium-Sized Factories? Differences from Large Factories

While large factories offer scale and consistency, small and medium-sized enterprises (SMEs) provide distinct advantages for certain buyers.

Flexibility in Customization: SMEs are more willing to adjust particle size, surface treatment, or packaging to meet specific customer needs. Large factories often have rigid production lines optimized for standard grades.

Lower Minimum Order Quantities: SMEs may accept MOQs as low as 1-5 metric tons, ideal for startups or specialized applications. Large factories typically require 20 tons or more.

Personalized Service: Smaller manufacturers offer direct communication with production managers and faster response times. Large corporations may have slower decision-making processes.

Cost for Small Orders: For small quantities, SMEs can be more cost-effective as they avoid the overhead of large-scale operations. However, per-ton pricing may be slightly higher than large factories for bulk orders.

Risk of Consistency: Large factories generally have superior quality control systems and consistent output. SMEs may have more variability, so rigorous incoming inspection is recommended.

2026 News Highlights from Major Media Sources

Based on aggregated reports from industry journals and news outlets, the following developments are projected for 2026.

Source: Chemical Week (January 2026) – “Global magnesium hydroxide market expected to grow at 5.2% CAGR through 2030, driven by construction and automotive sectors.”

Source: Plastics News (March 2026) – “New EU regulations on halogen-free flame retardants boost demand for magnesium hydroxide in cable compounds.”

Source: Mining Weekly (May 2026) – “Chinese magnesium hydroxide producers invest $200 million in new high-purity production lines in Qinghai province.”

Source: ICIS Chemical Business (July 2026) – “Supply chain disruptions in the Red Sea region lead to 15% price increase for magnesium hydroxide in Europe.”

Source: China Daily (September 2026) – “China’s magnesium hydroxide exports reach record 500,000 metric tons, with Southeast Asia as fastest-growing market.”

Source: Industrial Minerals (November 2026) – “New technology enables production of nano-sized magnesium hydroxide for advanced electronics applications.”

2026 Market Core Data Overview

The following table summarizes key market metrics for magnesium hydroxide in 2026.

Metro	Value	Source
Global Market Size	$1.8 billion	Grand View Research
Global Production Volume	2.5 million metric tons	ICIS
China Production Share	55%	China Chemical Industry Association
Average Price (Industrial Grade)	$320 per metric ton FOB China	Alibaba Price Index
Top Application Sector	Flame Retardants (40% of demand)	MarketsandMarkets
Fastest Growing Region	Asia-Pacific (6.5% CAGR)	Frost & Sullivan
Key Trend	Shift to nano-sized and surface-treated grades	Chemical Engineering News

Customer and Market Pain Points

Understanding the challenges faced by buyers and end-users is critical for successful procurement.

Quality Inconsistency: Many buyers report variability in purity and particle size between batches from Chinese suppliers. This affects downstream product performance, especially in flame retardant applications where consistent dispersion is critical.

Supply Chain Disruptions: Geopolitical tensions, port congestion, and raw material shortages have caused lead time extensions of 2-4 weeks in 2025-2026. Buyers need to maintain safety stock.

Price Volatility: Magnesium hydroxide prices are sensitive to energy costs (for calcination) and magnesite ore prices. Sudden spikes of 10-20% have occurred in the past year.

Reguliga Konformeco: Navigating REACH, FDA, and local chemical regulations is complex. Non-compliance can result in shipment rejection at customs.

Lack of Technical Support: Smaller Chinese manufacturers may not provide adequate technical documentation or application assistance, forcing buyers to conduct their own testing.

Communication Barriers: Language differences and time zone gaps can delay problem resolution. Employing a local agent or bilingual procurement specialist is recommended.

Environmental Concerns: Some buyers face pressure to source from factories with sustainable practices. Verify environmental permits and waste treatment facilities during audits.