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D459-16 – Standard Test Method Technical Guide
📖 Scope and Overview
This standard, designated D459-16, is under the jurisdiction of ASTM Committee D12 on Soaps and Other Detergents and the direct responsibility of Subcommittee D12.32 on Nomenclature and Definitions. It covers terminology relating to soaps and other detergents, originally approved in 1937 and last revised in 2016. The scope ensures clear and consistent definitions across the industry.
It references several ASTM standards for testing and analysis, including D460 for sampling and chemical analysis, D820 for soaps containing synthetic detergents, D2330 for methylene blue active substances, D2667 for biodegradability, D2960 for controlled laundering, D4265 for stain removal, and D5548 for color transfer.
Note: This standard is critical for consistent language in research, manufacturing, and quality control of soaps and detergents.
🧪 Key Terminology and Definitions
The standard provides definitions for a wide range of terms. Key terms include active oxygen and available chlorine, which have specific equivalent weights. Surfactant types such as ampholytic and anionic are also defined, along with test-related terms like artificially soiled cloth.
| 🟦 Term | 📏 Definition | ⚡ Value |
|---|---|---|
| Active Oxygen | Oxidizing power of oxygen as peroxide or similar moieties | Eq. wt. 8.00 |
| Available Chlorine | Oxidizing power of chlorine as hypochlorite | Eq. wt. 35.45 |
| ABS | Alkyl benzene sulfonate (branched chains) | N/A |
| LAS | Linear alkyl benzene sulfonate | N/A |
| Acid-Wash Color | Color developed in acid from sulfuric acid test | Method-specific |
| Builder | Material enhancing cleaning efficiency | N/A |
Additional terms include ampholytic surfactant, anionic detergent, and brightener (see fluorescent whitening agents). These definitions are essential for interpreting test results and product specifications.
⚙️ Important Parameters and Standards
The standard includes definitions for properties like buffer action (resistance to pH change) and bathroom soil (insoluble precipitate from soap in hard water). Test methods for these parameters are referenced to ensure uniformity in evaluating detergents.
Important: Definitions like “active oxygen” and “available chlorine” are standardized with specific equivalent weights, which are critical for accurate formulation and analysis of cleaning compounds.
❓ Frequently Asked Questions
🔍 What does ABS stand for?
It stands for alkyl benzene sulfonate, typically referring to branched chain compounds in the context of soaps and detergents.
💡 How is active oxygen defined?
It is the oxidizing power of oxygen present as peroxide or similar moieties in solution, expressed as oxygen with an equivalent weight of 8.00.
⚡ What is the equivalent weight of available chlorine?
Available chlorine has an equivalent weight of 35.45, representing its oxidizing power as determined by thiosulfate titration.
📌 What are the primary references for chemical analysis?
Standards like D460 (sampling and chemical analysis of soaps) and D820 (soaps with synthetic detergents) are referenced for consistent testing.