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D1762-84 – Standard Test Method Technical Guide
📐 Standard Overview and Scope
ASTM D1762-84 (Reapproved 2021) defines a standard test method for the chemical analysis of wood charcoal, covering moisture, volatile matter, and ash content. It is applicable to both lumps and briquets, facilitating quality evaluation and production assessment. This method is significant for evaluating charcoal made from low-quality wood and residues, assisting in production assessment and new method development. The method uses common laboratory apparatus, suitable for routine analyses of numerous samples.
⚙️ Required Apparatus and Sample Preparation
The standard requires specific equipment: a drying oven at 105±1°C, a muffle furnace for 750±5°C and 950±5°C, an analytical balance with 0.1 mg sensitivity, airtight containers, No. 20 (850 µm) sieves, porcelain crucibles (41×37 mm with lids), and a desiccator with calcium chloride. Samples must be representative and air-dried if wet. For moisture analysis, grind samples to pass the No. 20 sieve to prevent moisture loss from grinding heat. Sample selection shall follow Practices D346, D3176, and D3180.
| 🟦 Apparatus | 📏 Specification | 🎯 Application |
|---|---|---|
| Drying Oven | 105±1°C | Moisture determination |
| Muffle Furnace | 750±5°C | Ash determination |
| Muffle Furnace | 950±5°C | Volatile matter determination |
| Analytical Balance | Sensitivity: 0.1 mg | All weight measurements |
| Porcelain Crucibles | 41×37 mm with lids | Sample containment during heating |
💡 This method is adapted for routine analysis of large sample numbers, using equipment found in most laboratories.
📊 Key Test Methods and Specifications
The test method includes three main analyses. Moisture content is measured as weight loss at 105°C in a drying oven. Volatile matter is determined as weight loss at 950°C under specified conditions (including use of covered crucibles). Ash content is the residue after burning at 750°C to constant weight. These values are essential for evaluating charcoal quality and optimizing production.
| ⚡ Parameter | 📐 Temperature | 🔍 Measurement Principle |
|---|---|---|
| Moisture | 105±1°C | Loss in weight |
| Volatile Matter | 950±5°C | Loss in weight under specified conditions |
| Ash | 750±5°C | Residue after burning to constant weight |
⚠️ For purchase specifications, moisture content must be determined on samples ground to pass a No. 20 (850 µm) sieve to avoid moisture loss due to heat generation during grinding.
❓ Frequently Asked Questions
🔍 What does ASTM D1762-84 cover?
It covers the determination of moisture, volatile matter, and ash in wood charcoal, applicable to both lumps and briquets for quality evaluation.
💡 How should wet charcoal samples be prepared?
Rain-soaked or wet samples should be air-dried before analysis to ensure accurate results.
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.