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D260-86 – Standard Test Method Technical Guide
🛢️ Product Scope and Classification
Boiled linseed oil is a treated drying oil widely used in paints, varnishes, and wood finishes. ASTM D260-86, reapproved in 2001, defines two specific types: Type I, Regular Boiled Linseed Oil, and Type II, Double Boiled Linseed Oil. The primary distinction lies in their specific gravity and acid value limits, reflecting different treatment processes and viscosities. Both types, however, maintain a standard saponification value. This specification ensures uniformity in quality for industrial and commercial applications.
📏 Key Physical Properties and Composition
The specification outlines strict property ranges to classify the oils. These properties are critical for ensuring consistent drying behavior and film performance. Conformance to these limits is verified using specific ASTM standard test methods.
| 📐 Property | 🎯 Type I (Regular Boiled) | ⚡ Type II (Double Boiled) | 🔬 ASTM Test Method |
|---|---|---|---|
| Specific Gravity (25/25°C) | 0.928 to 0.938 | 0.930 to 0.945 | D 1963 / D 1475 |
| Acid Value (max) | 7.5 | 8.0 | D 1639 |
| Saponification Value | 189 | 189 | D 1962 |
💡 Tip: While the saponification value is identical for both types (189), the higher specific gravity and acid value of Type II Double Boiled oil indicates a slightly thicker, more processed oil suited for specialized high-build coating applications.
🧪 Standard Test Methods and Verification
Adherence to ASTM D260-86 requires that all properties be determined according to the associated ASTM test methods referenced in the specification. Key methods include D1475 for density, D1639 for acid value, D1963 for specific gravity, and D1962 for saponification value. Additional tests for quality control, such as color per D1544, ash content per D1951, drying properties per D1953, iodine value per D1959, and unsaponifiable matter per D1965, ensure the oil meets comprehensive industry standards for clarity and composition.
⚡ Important: Standard D 1953 for drying properties has been discontinued. Users must refer to the latest approved test methods applicable to the current standard for reporting drying time characteristics.
❓ Frequently Asked Questions
🔍 What is the main difference between Type I and Type II boiled linseed oil?
According to ASTM D260-86, the primary differences are in specific gravity and acid value. Type II (Double Boiled) has a higher specific gravity (0.930-0.945 vs 0.928-0.938) and a slightly higher maximum acid value (8.0 vs 7.5). This suggests a modified processing method resulting in a more bodied or polymerized state.
💡 What is the significance of the saponification value?
The saponification value is a measure of the average molecular weight of the fatty acids present in the oil. Both types of boiled linseed oil specified in this standard must have a saponification value of 189, indicating a consistent chemical composition profile typical of the raw linseed oil source.
⚡ Which test methods are referenced in this specification?
ASTM D260-86 relies on a suite of test methods. For the core properties listed in Table 1, it specifically references D1963 (Specific Gravity) and D1475 (Density). For additional compositional analysis, methods like D1639 (Acid Value), D1962 (Saponification Value), D1959 (Iodine Value), D1965 (Unsaponifiable Matter), D1951 (Ash), and D2090 (Clarity and Cleanness) are employed.
© 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence.