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Posted by Admin on April, 15, 2026
Why Your COA Is the Most Underread — Yet Most Critical — Document in Your Supply Chain
Every shipment of feldspar or quartz that arrives at your ceramic plant, glass furnace, or tile factory comes with a document that most procurement teams scan in under 30 seconds: the Certificate of Analysis (COA). Yet buried in its rows of oxide percentages and mesh specifications lies the difference between a flawless white ceramic body and a kiln full of warped, discoloured rejects.
In 2024–2025, as global ceramics demand surged post-pandemic and supply chains stretched across continents, the number of fraudulent, incomplete, or misleading COAs entering the market has risen sharply. The explosion of AI-generated certificates and template-copy documents is making it harder than ever for QC managers to distinguish a genuinely high-purity product from a mediocre one dressed in professional-looking paperwork.
This guide — produced by Aalok Overseas / FeldsparIndia.com, one of India's most trusted mineral exporters — breaks down the anatomy of a legitimate, high-purity COA, explains the related MSDS/SDS document, demystifies the AI Certificate of Origin and AIFTA preferential trade certificates, and gives you 5 unmistakable red flags to look for before you approve any shipment.
Global Demand for Best High-Purity Feldspar & Quartz
Who Uses Feldspar & Quartz? — Industries in Multiple Languages
Feldspar and quartz are not niche industrial minerals — they are the backbone of some of the world's largest manufacturing sectors. Here is a global snapshot of the key industries that depend on high-purity, accurately documented feldspar and quartz:
Key Mineral Production Areas — Feldspar & Quartz in India
| State / Region | Mineral | Key Districts | Quality Characteristics |
|---|---|---|---|
| Rajasthan ⭐ BEST | Potash Feldspar, Quartz | Ajmer, Bhilwara, Pali, Nagaur, Sikar | High K₂O (11–13%), ultra-low Fe₂O₃ (<0.06%), consistent whiteness 88–92% |
| Gujarat | Soda Feldspar, Quartz | Surendranagar, Rajkot, Bhavnagar, Morbi | High Na₂O (9–11%), excellent glaze-grade material |
| Andhra Pradesh | Feldspar, Quartz Silica | Nellore, Kadapa, Prakasam | Low iron quartz, ceramics grade SiO₂ 98–99% |
| Tamil Nadu | Quartz, Silica Sand | Salem, Namakkal, Vellore | Glass-grade quartz, high SiO₂ 99–99.5% |
| Jharkhand | Quartz, Feldspar | Koderma, Giridih, Hazaribagh | Specialty ceramic and refractory applications |
| Karnataka | Quartz, Feldspar | Hassan, Mysore, Chitradurga | Electronics and high-purity refractory grade |
Aalok Overseas / FeldsparIndia.com sources from Rajasthan and Gujarat — the best production zones for export-grade, high-purity feldspar and quartz in India. All material undergoes independent third-party lab analysis before shipment.
What Is a COA (Certificate of Analysis)?
A Certificate of Analysis (COA) is a formal quality document issued by a manufacturer or an accredited third-party laboratory that details the chemical composition, physical properties, and compliance parameters of a mineral product in a specific batch or lot. For feldspar and quartz, the COA is the single most important document that determines whether a raw material meets your ceramic, glass, or refractory recipe requirements.
International buyers know this document by many names:
Standard Parameters in a Feldspar COA — What Every Number Means
| Parameter | Potash Feldspar (K-Spar) | Soda Feldspar (Na-Spar) | Why It Matters for Ceramics |
|---|---|---|---|
| SiO₂ (Silica) | 64–68% | 65–69% | Glass network former; affects viscosity, shrinkage & strength |
| Al₂O₃ (Alumina) | 17–20% | 18–21% | Refractory strength, hardness, thermal resistance |
| K₂O (Potash) | 10–13% ⭐ | <2% | Flux at 1000–1200°C; controls melting behaviour & translucency |
| Na₂O (Soda) | <3% | 8–12% ⭐ | Lower-melting flux; essential for glaze fluidity |
| Fe₂O₃ (Iron Oxide) | <0.08% | <0.12% | CRITICAL: Fe₂O₃ above 0.15% causes yellowing/graying of fired ware |
| TiO₂ (Titanium) | <0.02% | <0.02% | Causes yellowness — must be ultra-low for white bodies & sanitaryware |
| CaO (Calcium) | <1% | <1.5% | Can cause lime pitting if above 2%; check carefully |
| MgO (Magnesia) | <0.1% | <0.1% | Minor flux effect; low is better for consistency |
| LOI (Loss on Ignition) | <0.5% | <0.5% | Organic or carbonate content; high LOI = kiln gas, blistering |
| Whiteness (Elrepho) | 85–92% | 82–90% | Fired colour prediction — critical for white tile & sanitaryware |
| D50 / Mesh Size | As agreed | As agreed | Reactivity, flowability, blending consistency in body |
Standard Parameters in a Quartz / Silica COA
| Parameter | Ceramic Grade | Glass Grade | Electronics / HP Grade | Impact |
|---|---|---|---|---|
| SiO₂ | 97–99% | 99.0–99.5% | 99.9%+ | Core quality indicator; higher = purer |
| Fe₂O₃ | <0.05% | <0.02% | <0.001% | Discolouration & electrical conductivity in electronics |
| Al₂O₃ | <0.5% | <0.2% | <0.05% | Affects viscosity of glass melt |
| TiO₂ | <0.05% | <0.02% | <0.005% | Yellowing agent — critical in optical glass |
| Moisture | <0.3% | <0.1% | <0.05% | Affects transport weight, flowability, processing |
| Mesh / Grain Size | As specified | As specified | Ultra-fine specified | Critical for reactivity & consistent processing |
What Is an MSDS / SDS? — Material Safety Data Sheet for Feldspar & Quartz
A Material Safety Data Sheet (MSDS), now globally standardised as SDS (Safety Data Sheet) under the GHS (Globally Harmonised System of Classification and Labelling of Chemicals), is a mandatory safety document that accompanies industrial minerals including feldspar and quartz in all professional trade transactions.
The MSDS/SDS is known internationally as:
- Sicherheitsdatenblatt (SDB) — Germany, Austria, Switzerland
- Fiche de Données de Sécurité (FDS) — France, Belgium, Quebec
- Ficha de Datos de Seguridad (FDS) — Spain, Latin America
- برگه اطلاعات ایمنی مواد — Iran / Farsi
- 安全数据表 / 化学品安全数据表 — China
- 安全データシート (SDS) — Japan
- صحيفة بيانات السلامة — Arabic-speaking markets
- Güvenlik Bilgi Formu (GBF) — Turkey
The 16 Sections of a Compliant Feldspar / Quartz SDS
| # | SDS Section | Key Information for Feldspar / Quartz | QC Relevance |
|---|---|---|---|
| 1 | Identification | Product name, grade, supplier details, emergency contact | Verify supplier legitimacy |
| 2 | Hazard Identification | GHS classification — feldspar is irritant; quartz is IARC Group 1 carcinogen (respirable crystalline silica) | PPE requirements |
| 3 | Composition / Ingredients | CAS numbers: Feldspar 68476-25-5; Quartz/SiO₂ 14808-60-7 | Verify chemical identity |
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