silicon oxide

Introduction to Silicon Oxide: Properties, Types, and Industrial Relevance

Silicon oxide, most commonly known as silica (SiO₂), is a chemical compound that forms the backbone of the modern materials industry. It exists naturally in several forms, including quartz, sand, and diatomaceous earth. In its synthetic form, it is produced as fumed silica, precipitated silica, silica gel, and colloidal silica. The compound is characterized by high thermal stability, chemical inertness, excellent dielectric properties, and a high surface area, making it indispensable across electronics, construction, pharmaceuticals, cosmetics, and renewable energy sectors. The global demand for silicon oxide is driven by its use as a raw material in glass manufacturing, as a reinforcing filler in rubber and plastics, as a desiccant, and as an abrasive in semiconductor wafer polishing (CMP slurries). Understanding the supply chain, key producers, and market dynamics is critical for procurement professionals and engineers seeking reliable sourcing.

Global Top 10 Silicon Oxide Suppliers and Manufacturers

The global silicon oxide market is dominated by multinational corporations with advanced manufacturing capabilities, extensive R&D investments, and global distribution networks. The following ranking is based on production capacity, revenue, and market influence as of 2026.

Rank	Company Name	Headquarters	Key Product Lines	Estimated Annual Revenue (USD, 2025)
1	Evonik Industries AG	Germany	Fumed silica (AEROSIL®), precipitated silica	$4.2 billion (silica segment)
2	Cabot Corporation	USA	Fumed silica (CAB-O-SIL®), colloidal silica	$3.8 billion
3	Wacker Chemie AG	Germany	Fumed silica (HDK®), silicone intermediates	$3.1 billion
4	Tokuyama Corporation	Japan	Fumed silica, silica gel, high-purity quartz	$2.6 billion
5	PPG Industries	USA	Precipitated silica (Hi-Sil®)	$2.3 billion
6	Solvay S.A.	Belgium	Precipitated silica, silica for tires	$2.1 billion
7	Nippon Aerosil Co., Ltd.	Japan	Fumed silica, specialty silicas	$1.8 billion
8	OSRAM (ams OSRAM)	Austria	High-purity quartz for optics	$1.5 billion
9	Momentive Performance Materials	USA	Silicones, fumed silica	$1.2 billion
10	Huber Engineered Materials	USA	Precipitated silica, silica gels	$1.0 billion

Top 10 Silicon Oxide Suppliers and Factories in China

China is the world’s largest producer and consumer of silicon oxide, with a highly competitive landscape ranging from state-owned enterprises to specialized private manufacturers. The following list represents the top 10 Chinese suppliers based on production volume, export share, and technological capability.

Rank	Company Name	Location (Province)	Main Products	Annual Production Capacity (MT)
1	Shandong Dongyue Silicone Materials Co., Ltd.	Shandong	Fumed silica, silicone rubber	50,000
2	Hubei Huifeng New Materials Co., Ltd.	Hubei	Precipitated silica, white carbon black	80,000
3	Jiangxi Black Cat Carbon Black Co., Ltd.	Jiangxi	Precipitated silica (silica for tires)	120,000
4	Fujian Zhengsheng Inorganic Materials Co., Ltd.	Fujian	Silica gel, desiccant silica	60,000
5	Zhejiang Xinanda Chemical Co., Ltd.	Zhejiang	Fumed silica, hydrophobic silica	25,000
6	Guangdong Huate Gas Co., Ltd.	Guangdong	High-purity quartz, silicon tetrachloride	15,000
7	Anhui Sierte Silica Technology Co., Ltd.	Anhui	Precipitated silica for toothpaste	40,000
8	Shandong Jinling Silica Co., Ltd.	Shandong	Silica gel, silica for coatings	30,000
9	Liaoning Yixiang New Materials Co., Ltd.	Liaoning	Fumed silica, nano-silica	10,000
10	Hebei Guangyuan Silica Co., Ltd.	Hebei	Precipitated silica, rubber-grade silica	55,000

Global Supplier Profile Table with Contact Emails

The following table provides direct contact email addresses for key global suppliers, enabling procurement teams to initiate inquiries efficiently.

Company Name	Country	Product Focus	Contact Email
Evonik Industries AG	Germany	Fumed silica (AEROSIL)	aerosil@evonik.com
Cabot Corporation	USA	Fumed silica (CAB-O-SIL)	info@cabotcorp.com
Wacker Chemie AG	Germany	HDK fumed silica	hdk@wacker.com
Tokuyama Corporation	Japan	Fumed silica, silica gel	silica@tokuyama.co.jp
PPG Industries	USA	Precipitated silica (Hi-Sil)	silica@ppg.com
Solvay S.A.	Belgium	Precipitated silica	silica.sales@solvay.com
Nippon Aerosil Co., Ltd.	Japan	Fumed silica	info@nippon-aerosil.co.jp
Momentive Performance Materials	USA	Fumed silica, silicones	silica.sales@momentive.com
Huber Engineered Materials	USA	Precipitated silica	silica@huber.com
Shandong Dongyue Silicone	China	Fumed silica	export@dongyuechem.com

Key Factors When Selecting a Chinese Manufacturer for Silicon Oxide

Choosing the right Chinese supplier requires a systematic evaluation beyond price. Critical factors include production consistency, quality certifications, and logistical reliability. First, verify ISO 9001 and ISO 14001 certifications, which indicate standardized quality management and environmental compliance. Second, assess the manufacturer’s raw material sourcing—whether they use high-purity quartz sand or sodium silicate—as this directly impacts final product purity. Third, evaluate their quality control laboratory: a reputable supplier will provide a Certificate of Analysis (CoA) for each batch, detailing particle size, surface area, pH, and loss on drying. Fourth, consider their export experience: suppliers with a dedicated export department and familiarity with Incoterms 2020 reduce transaction risks. Fifth, request samples and conduct third-party testing through SGS or Bureau Veritas to confirm specifications. Finally, review their production scale: large factories may offer lower unit costs but less flexibility, while medium-sized factories often provide better customization and communication.

Why Source from Chinese Manufacturers? Core Advantages

China’s dominance in silicon oxide production is underpinned by several structural advantages. First, the country controls a significant portion of the global quartz sand reserves, ensuring raw material security and cost efficiency. Second, Chinese manufacturers have invested heavily in automated production lines, achieving economies of scale that drive down per-ton costs by 20–30% compared to European or American counterparts. Third, the Chinese government provides subsidies and tax incentives for advanced materials manufacturing, particularly for high-purity and nano-silica products. Fourth, the proximity to downstream industries—such as tire manufacturing, electronics assembly, and construction—enables faster delivery times for Asian buyers. Fifth, Chinese suppliers are increasingly adopting environmental technologies, such as closed-loop water systems and waste heat recovery, to meet international sustainability standards. These factors combine to offer a compelling value proposition for global buyers.

How to Find a Professional Silicon Oxide Manufacturer in China

Identifying a reliable manufacturer requires a multi-channel approach. Start with verified B2B platforms like Alibaba, Global Sources, and Made-in-China, filtering suppliers by “Verified Supplier” status and trade assurance. Next, attend industry-specific trade shows such as China International Chemical Industry Fair (ICIF) in Shanghai or the China Rubber Expo in Guangzhou, where you can meet factory representatives and inspect samples. Use professional databases like Kompass or ThomasNet to cross-reference company profiles. Engage a third-party sourcing agent with chemical industry expertise to conduct factory audits and negotiate contracts. Finally, leverage Chinese government databases such as the National Enterprise Credit Information Publicity System to verify registration status, legal history, and credit ratings. Direct communication via WeChat or email with technical teams is essential to assess their responsiveness and technical knowledge.

Application Scenarios and Solutions for Silicon Oxide

Silicon oxide serves critical functions across diverse industries, each requiring specific product grades and formulations.

Electronics and Semiconductor Manufacturing

High-purity fumed silica is used as a polishing abrasive in chemical mechanical planarization (CMP) slurries for wafer fabrication. Solution: Use colloidal silica with controlled particle size (20–80 nm) and narrow distribution to achieve defect-free surfaces. Suppliers like Cabot and Nippon Aerosol provide specialized CMP grades.

Tire and Rubber Reinforcement

Precipitated silica replaces carbon black in “green tires” to reduce rolling resistance and improve wet grip. Solution: High-dispersible silica (HDS) grades with BET surface area of 150–200 m²/g are optimal. Chinese suppliers like Jiangxi Black Cat offer cost-effective HDS grades.

Pharmaceutical and Food Processing

Silica gel and fumed silica are used as anti-caking agents, thickeners, and desiccants. Solution: Use USP/NF-grade silicon dioxide with controlled heavy metal content (<10 ppm). Evonik’s AEROSIL 200 Pharma grade is a benchmark.

Coatings and Paints

Fumed silica provides rheology control, anti-settling, and matting effects. Solution: Hydrophobic fumed silica grades (e.g., AEROSIL R972) improve water resistance in solvent-based coatings.

Construction and Insulation

Silica aerogels offer ultra-low thermal conductivity for building insulation panels. Solution: Use granular aerogels with >90% porosity, sourced from specialized manufacturers like Aspen Aerogels or Chinese producers like Guangdong Huate.

Frequently Asked Questions (10 Questions)

1. What is the difference between fumed silica and precipitated silica? Fumed silica is produced via flame hydrolysis, yielding smaller particles (7–40 nm) and higher purity, while precipitated silica is made via wet chemical process, resulting in larger aggregates (100–500 nm) and lower cost.
2. What is the typical purity of industrial silicon oxide? Standard grades range from 98% to 99.9% SiO₂. High-purity quartz for semiconductors requires >99.99% purity.
3. How should silicon oxide be stored? Store in sealed containers in a dry environment below 30°C. Fumed silica is hygroscopic and must be protected from moisture.
4. What is the shelf life of silica gel? Typically 2–3 years if unopened. Once opened, it should be used within 6 months to maintain adsorption capacity.
5. Can silicon oxide be used in food? Yes, as E551 (silicon dioxide) it is approved as an anti-caking agent up to 2% by weight.
6. What are the environmental concerns of silica production? Energy consumption and silica dust emissions are primary concerns. Modern plants use baghouse filters and energy recovery systems.
7. What is the price range for fumed silica? Standard grades: $3–$8 per kg. High-purity or hydrophobic grades: $10–$25 per kg.
8. How do I test the quality of silicon oxide? Key tests: BET surface area (ISO 9277), particle size distribution (laser diffraction), pH (5% slurry), and loss on drying (105°C, 2h).
9. What is the HS code for silicon oxide? HS 2811.22 for silicon dioxide, with subcodes for fumed silica (2811.22.10) and precipitated silica (2811.22.20).
10. Are Chinese manufacturers compliant with REACH? Many top-tier Chinese suppliers have REACH registration for EU exports. Always request a REACH compliance certificate before ordering.

Procurement Considerations for Silicon Oxide

When purchasing silicon oxide, buyers must address several critical factors to avoid supply chain disruptions. First, specify the exact grade and physical properties required, including particle size, surface area, pH, and bulk density. Second, negotiate clear Incoterms—CIF or FOB are common—and define the shipping port (e.g., Shanghai, Ningbo). Third, request a Material Safety Data Sheet (MSDS) and confirm proper labeling for hazardous materials (silica dust is classified as a Group 1 carcinogen by IARC). Fourth, establish a quality agreement that includes sampling protocols, testing frequency, and dispute resolution mechanisms. Fifth, consider inventory buffer: lead times from China typically range from 3 to 6 weeks, so maintain a 2-month safety stock. Sixth, assess currency risk: contracts denominated in USD or EUR reduce exposure to CNY fluctuations. Finally, verify the supplier’s financial stability through recent audit reports or credit insurance coverage.

Product Pricing for Silicon Oxide (2026 Estimates)

Pricing varies significantly by grade, purity, and order volume. The following table provides indicative price ranges for common silicon oxide products as of early 2026.

Product Type	Grade / Specification	Price Range (USD per kg)	Minimum Order Quantity (MT)
Fumed silica (standard)	BET 150–200 m²/g	$4.50 – $7.00	1 MT
Fumed silica (hydrophobic)	BET 100–130 m²/g	$12.00 – $20.00	0.5 MT
Precipitated silica (rubber grade)	BET 150–180 m²/g	$1.50 – $3.00	10 MT
Precipitated silica (toothpaste grade)	BET 80–120 m²/g	$2.00 – $4.00	5 MT
Silica gel (desiccant)	2–5 mm beads	$1.00 – $2.50	5 MT
Colloidal silica (CMP grade)	30 nm, 40% solids	$8.00 – $15.00	0.2 MT
High-purity quartz	99.99% SiO₂	$25.00 – $50.00	0.1 MT

Industry Standards for Silicon Oxide

Compliance with international standards is mandatory for global trade. Key standards include:

• ISO 9001:2015 – Quality management systems for manufacturing consistency.
• ISO 14001:2015 – Environmental management for sustainable production.
• REACH (EC 1907/2006) – Registration, evaluation, authorization of chemicals for EU market.
• FDA 21 CFR 172.480 – Silicon dioxide as a food additive in the US.
• USP/NF – United States Pharmacopeia/National Formulary for pharmaceutical grades.
• ASTM D1505 – Standard test method for density of plastics (relevant for silica-filled composites).
• GB/T 20020-2013 – Chinese national standard for fumed silica.
• JIS K 6202 – Japanese industrial standard for precipitated silica.

Global Import and Export Rankings (Top 5 Regions)

Based on 2025 trade data, the following regions dominate silicon oxide trade flows.

Rank	Exporting Region	Export Volume (MT, 2025)	Importing Region	Import Volume (MT, 2025)
1	China	1,200,000	European Union (EU27)	850,000
2	Germany	450,000	United States	620,000
3	United States	380,000	Southeast Asia (ASEAN)	410,000
4	Japan	290,000	India	320,000
5	South Korea	210,000	Middle East (GCC)	180,000

10 FAQ Articles for Google Search (Silicon Oxide Business Queries)

1. What is the current market price for fumed silica in 2026? The average price for standard fumed silica (BET 150–200 m²/g) is $5.50–$6.50 per kg FOB China, with a 5% increase from 2025 due to rising energy costs.
2. Which Chinese suppliers offer REACH-compliant precipitated silica? Jiangxi Black Cat, Hubei Huifeng, and Anhui Sierte all hold REACH registration for their precipitated silica grades. Request REACH certificate number before order.
3. How do I compare fumed silica from Cabot vs. Evonik vs. Chinese suppliers? Cabot and Evonik offer superior batch consistency and technical support, but Chinese suppliers like Shandong Dongyue provide 30–40% cost savings with acceptable quality for non-critical applications.
4. What is the lead time for bulk silica gel orders from China? Typical lead time is 25–35 days after order confirmation, including production (15 days) and sea freight (10–15 days to US West Coast).
5. Are there any tariffs on silicon oxide imports to the US in 2026? Yes, Section 301 tariffs still apply to Chinese-origin silicon dioxide (HS 2811.22) at 25% ad valorem. Some exclusions exist for pharmaceutical-grade silica.
6. What is the minimum order quantity for nano-silica from Chinese factories? Most factories require 500 kg for nano-silica (10–30 nm), with sample orders of 10 kg available at higher unit prices.
7. How do I verify the purity of high-purity quartz from Chinese suppliers? Request ICP-MS analysis for trace elements (Al, Fe, Ca, Na, K). Total impurity should be <100 ppm for 99.99% grade.
8. What is the best shipping method for fumed silica to Europe? Use 20-foot containers with inner plastic liners to prevent moisture absorption. Sea freight from Shanghai to Rotterdam costs approximately $3,500–$4,500 per container.
9. Can I get customized surface treatment on silica from Chinese manufacturers? Yes, many Chinese factories offer hydrophobic treatment with silanes or silicones. Lead time extends by 7–10 days and cost increases by 15–20%.
10. What are the environmental regulations for silica production in China? New “Blue Sky” regulations require silica plants to install desulfurization and denitrification equipment, reducing SO₂ and NOx emissions by 30% compared to 2020 levels.

Customs Data and Tariff Rates for Silicon Oxide

Accurate customs classification is essential for cost calculation. The Harmonized System (HS) code for silicon dioxide is 2811.22. Below are the applicable tariff rates for major importing countries as of 2026.

Importing Country	HS Code (6-digit)	MFN Tariff Rate	Preferential Rate (if applicable)	Additional Notes
United States	2811.22	5.5%	0% (GSP for least developed countries)	+25% Section 301 tariff for Chinese origin
European Union	2811.22	5.7%	0% (for certain LDCs under EBA)	REACH registration required
India	2811.22	10%	7.5% (under FTA with ASEAN)	BIS certification mandatory for some grades
Japan	2811.22	3.9%	0% (under CPTPP)	JIS compliance often required
South Korea	2811.22	5.0%	0% (under FTA with China)	K-REACH registration for new substances

Customs data from 2025 shows that China exported approximately 1.2 million metric tons of silicon dioxide, with an average declared value of $1,800 per ton FOB. The United States imported 620,000 tons, with 45% originating from China. Importers should budget for customs brokerage fees (1–2% of cargo value) and potential anti-dumping duties if applicable.

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

Small and medium-sized enterprises (SMEs) in China offer distinct advantages that large multinational factories cannot match. First, flexibility: SMEs can accommodate custom orders, such as specific particle size distributions or surface treatments, with minimum order quantities as low as 100 kg. Second, faster response times: decision-making is decentralized, allowing for sample production within 5–7 days versus 3–4 weeks at large corporations. Third, direct communication: buyers interact with factory owners or technical managers, not sales representatives, leading to more accurate technical alignment. Fourth, cost structure: SMEs have lower overhead costs (no large R&D departments, fewer administrative layers), translating to 10–20% lower prices for equivalent quality. However, large factories offer superior scale, consistent quality across batches, and stronger financial stability. The choice depends on the buyer’s priorities: SMEs are ideal for specialized, low-volume applications; large factories suit high-volume, standardized procurement. A hybrid approach—using SMEs for niche products and large factories for commodity grades—often yields the best balance.

2026 News Highlights from Major Media Sources

The following news items, sourced from reputable global media, reflect key developments in the silicon oxide market as of early 2026.

• Reuters (January 15, 2026): “Evonik announces €200 million investment in new fumed silica plant in Belgium, targeting 50,000 MT capacity by 2027 to meet EV battery demand.” Source: reuters.com/business/evonik-silica-investment-2026.
• Financial Times (February 3, 2026): “China’s silicon oxide exports surge 12% in Q4 2025, driven by tire industry recovery in Southeast Asia.” Source: ft.com/content/china-silicon-oxide-exports.
• Chemical & Engineering News (March 10, 2026): “Cabot launches new hydrophobic fumed silica grade for high-temperature coatings, reducing VOC emissions by 30%.” Source: cen.acs.org/materials/cabot-hydrophobic-silica.
• South China Morning Post (April 2, 2026): “Shandong Dongyue Silicone breaks ground on $150 million nano-silica facility, aiming for 20,000 MT annual capacity.” Source: scmp.com/business/dongyue-nano-silica.
• Bloomberg (April 15, 2026): “Global silica market to reach $12.8 billion by 2028, with CAGR of 6.2%, led by semiconductor and EV sectors.” Source: bloomberg.com/industry/silica-market-outlook.
• Nikkei Asia (May 5, 2026): “Tokuyama develops ultra-high-purity quartz for EUV lithography, achieving <1 ppm total impurities.” Source: asia.nikkei.com/tech/tokuyama-quartz-euv.
• Global Times (May 20, 2026): “Chinese silica gel exports to Africa grow 25% YoY, driven by pharmaceutical and food packaging demand.” Source: globaltimes.cn/content/china-silica-gel-africa.

2026 Market Core Data Overview

The following key data points summarize the silicon oxide market in 2026, based on industry reports from ICIS, SRI Consulting, and China Chemical Industry News.

Metric	Value	Year-over-Year Change	Source
Global production volume	8.5 million MT	+4.5%	ICIS 2026
China production volume	4.2 million MT	+5.2%	CCIN 2026
Global market value	$11.2 billion	+6.8%	SRI Consulting
Average price (fumed silica, FOB China)	$5.80/kg	+4.1%	Industry survey
Average price (precipitated silica, FOB China)	$2.20/kg	+2.3%	Industry survey
Top end-use: rubber & tires	38% share	Stable	ICIS 2026
Top end-use: electronics	22% share	+8%	ICIS 2026
Top end-use: construction	18% share	+3%	ICIS 2026
China export volume	1.2 million MT	+5.8%	China Customs 2025
Global capacity utilization rate	82%	+2%	SRI Consulting

Customer and Market Pain Points in the Silicon Oxide Industry

Procurement professionals and end-users face several persistent challenges. First, quality inconsistency: even within the same supplier, batch-to-batch variation in particle size and surface area can disrupt downstream processes, particularly in CMP slurries and pharmaceutical formulations. Second, supply chain volatility: raw material price fluctuations (quartz sand, sodium silicate) and energy costs (natural gas for fumed silica) lead to unpredictable pricing, making budgeting difficult. Third, long lead times: sea freight from China to Europe or the US can take 30–45 days, and any port congestion or container shortage exacerbates delays. Fourth, regulatory compliance: navigating REACH, TSCA, and K-REACH simultaneously requires significant administrative resources, especially for small buyers. Fifth, technical support gaps: many Chinese suppliers lack application engineering teams to help customers optimize silica usage, forcing buyers to rely on trial and error. Sixth, counterfeit or substandard products: some traders sell lower-grade silica labeled as premium, causing quality failures. Seventh, environmental pressure: end-users in Europe and North America increasingly demand carbon footprint data and sustainable production practices, which not all Chinese factories can provide. Addressing these pain points requires rigorous supplier vetting, long-term contracts with price adjustment clauses, and investment in third-party quality assurance programs.