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D1842-63 – Standard Test Method Technical Guide
ASTM D1842-63 (Reapproved 1998) specifies the requirements for distilled corn fatty acids derived from corn oil, typically from recovered corn oil. This standard ensures quality for use in protective coatings and other applications.
📐 Scope and Referenced Standards
The scope of this standard covers distilled fatty acids from corn oil. It references several ASTM standards for testing: D 1467 Guide for Testing Fatty Acids Used in Protective Coatings, D 1544 Test Method for Color of Transparent Liquids (Gardner Color Scale), D 1959 Test Method for Iodine Value of Drying Oils and Fatty Acids, D 1962 Test Method for Saponification Value of Drying Oils, Fatty Acids, and Polymerized Fatty Acids, D 1965 Test Method for Unsaponifiable Matter in Drying Oils, Fatty Acids, and Polymerized Fatty Acids, D 1980 Test Method for Acid Value of Fatty Acids and Polymerized Fatty Acids, and D 1982 Test Method for Titer of Fatty Acids.
⚙️ Properties and Requirements
Distilled corn fatty acids must conform to the requirements in Table 1. The key properties include acid value, saponification value, unsaponifiable matter, iodine value, color, and titer.
| 🟦 Property | 📏 Test Method | 🎯 Requirement |
|---|---|---|
| Acid value | D 1980 | 195 to 205 |
| Saponification value | D 1962 | 197 to 207 |
| Unsaponifiable matter, max, % | D 1965 | 1.50 |
| Iodine value, min | D 1959 | 110 |
| Color, Gardner, max | D 1544 | 8 |
| Titer, °C | D 1982 | 26 to 32 |
All testing should be performed in accordance with ASTM D 1467 to ensure consistent and reliable results.
📊 Test Methods
The properties enumerated in this specification are determined using specific ASTM test methods. Acid value is measured per D 1980, saponification value per D 1962, unsaponifiable matter per D 1965, iodine value per D 1959, color per D 1544, and titer per D 1982. These methods provide accurate characterization of distilled corn fatty acids.
Note that this standard was reapproved in 1998 and is subject to revision. Always use the current version for compliance.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D1842-63?
It covers distilled fatty acids derived from corn oil, typically recovered corn oil, used in protective coatings and other applications.
💡 How is the acid value determined?
The acid value is determined using ASTM D 1980, which involves titration to measure free fatty acids.
⚡ What does the iodine value indicate?
Iodine value indicates the degree of unsaturation; for distilled corn fatty acids, it must be at least 110.
📌 Why is titer important?
Titer, measured by D 1982, specifies the solidification point range of 26 to 32°C, which is critical for handling and formulation.