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D4206-96 – Standard Test Method Technical Guide
📐 Test Apparatus and Preparation
The test apparatus is built around a block of aluminum alloy or other nonrusting metal with high heat conductivity. This block has a concave depression called the “well” designed to hold the liquid mixture. A standard source of flame is attached to the block, capable of being swung over the center of the well at a specified distance. Prior to testing, the block is heated to a required temperature of 120°F (49°C).
| 🟦 Component | 📏 Description |
|---|---|
| Metal Block | Aluminum alloy or nonrusting metal with high thermal conductivity |
| Well | Concave depression for containing the liquid sample |
| Flame Source | Standard flame source that can be swung over the well center |
💡 Tip: Always preheat the block to 120°F (49°C) accurately to ensure consistent test results across different samples.
⚙️ Test Procedure and Evaluation
The test procedure involves heating the metal block to 120°F (49°C) and placing the liquid mixture in the concave well. The standard flame source is then swung over the center of the well at a specified distance, and the operator observes whether the mixture sustains burning. This test method is a modification of the British Standard BS-3900 Part A-11, Small Scale Test for Combustibility, allowing direct observation of sustained burning rather than deduction from flash point.
📊 Applications and Key Specifications
This test method is designed for determining the sustained burning characteristics of mixtures of flammable and nonflammable liquids or liquids with widely different flash points. It is often used after flash point determination, particularly when the flash point is below flammability classification limits such as 100°F specified by the U.S. Department of Transportation. Values are stated in inch-pound units with SI conversions in parentheses. The standard is not intended for direct fire hazard assessment but can serve as an element in fire hazard or risk assessments.
| 📐 Parameter | 🎯 Specification |
|---|---|
| Test Temperature | 120°F (49°C) |
| Reference Standard | BS-3900 Part A-11 |
| Scope of Application | Mixtures of flammable and nonflammable liquids |
⚠️ Warning: This standard does not purport to address all safety concerns. Users are responsible for establishing appropriate safety, health, and environmental practices before use.
❓ Frequently Asked Questions
🔍 What is the main purpose of ASTM D4206-96?
To determine the sustained burning characteristics of liquid mixtures using a small scale open-cup apparatus.
💡 How does this test relate to flash point determination?
It can be used in conjunction with flash point testing to assess whether a mixture sustains burning, especially when flash points are below classification limits.
⚡ What is the specified test temperature?
The apparatus is heated to 120°F (49°C) for testing.
📌 What British Standard is referenced?
BS-3900 Part A-11, Small Scale Test for Combustibility.