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D1394-76 – Standard Test Method Technical Guide
The ASTM D1394-76 standard, reapproved in 2020, provides standardized test methods for the chemical analysis of white titanium dioxide pigments. These methods are essential for quality control in the paint and related coatings industries. The standard covers procedures for determining moisture, total titanium, aluminum oxide, and silica, ensuring comprehensive analysis of these pigments.
🧪 Standard Overview and Test Methods
This standard includes several key analytical procedures, each designed for specific components of titanium dioxide pigments. The following table summarizes the main test methods and their corresponding sections in the standard.
| 🟦 Section | 📏 Procedure | 🎯 Description |
|---|---|---|
| 4 | Sample Preparation | Thorough mixing and comminution of sample |
| 7 | Moisture Determination | Hygroscopic moisture test according to D280 |
| 8–12 | Total Titanium (Jones Reductor Method) | Reduction using Jones reductor followed by titration |
| 13–17 | Total Titanium (Aluminum Reduction Method) | Reduction using aluminum for titanium determination |
| 18–22 | Aluminum Oxide | Quantitative analysis of Al₂O₃ |
| 23–29 | Silica | Determination of SiO₂ content |
The qualitative analysis sections (5 and 6) provide reagents and procedures for identifying impurities, including ammonium hydroxide, hydrogen peroxide, and hydrogen sulfide tests.
📊 Reagent and Sample Requirements
The standard mandates specific reagent grades and water purity to ensure accuracy. All reagents should be ACS reagent grade unless otherwise specified. Water must conform to Type IV of ASTM D1193.
| 🟦 Reagent | 📐 Specification | ⚡ Notes |
|---|---|---|
| Ammonium Hydroxide | sp gr 0.90 | Concentrated NH₄OH |
| Hydrochloric Acid | sp gr 1.19 | Concentrated HCl |
| Hydrogen Peroxide | 30% | Concentrated H₂O₂ |
| Sulfuric Acid | sp gr 1.84 | Concentrated H₂SO₄ |
| Reagent Water | Type IV per D1193 | For all test solutions |
Sample preparation is critical: the sample must be thoroughly mixed and comminuted before taking portions for analysis to ensure representative results.
For optimal accuracy, use only reagent grade chemicals and ensure water meets Type IV standards as specified in D1193.
Handle concentrated acids and hydrogen peroxide with care. Refer to Section 19 for specific hazard information.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D1394-76?
This standard covers test methods for chemical analysis of white titanium dioxide pigments, including moisture, total titanium, aluminum oxide, and silica determination.
💡 How should the pigment sample be prepared?
The sample must be thoroughly mixed and comminuted to ensure homogeneity before analysis.
⚡ What safety precautions are mentioned?
A specific hazard statement is provided in Section 19. Users must establish appropriate safety and health practices, especially when handling hazardous chemicals.
📌 What type of water is required for the tests?
Reagent water conforming to Type IV of ASTM Specification D1193 should be used unless otherwise indicated.