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D234-82 – Standard Test Method Technical Guide
📋 Scope and Referenced Documents
This specification, ASTM D234 – 82 (Reapproved 1998), covers raw linseed oil obtained from flaxseed. The standard is issued under the fixed designation D234 and is under the jurisdiction of ASTM Committee D-1 on Paint and Related Coatings, Materials, and Applications. Key referenced documents include Test Methods D 93, D 555, D 1466, D 1544, D 1639, D 1954, D 1959, D 1960, D 1962, D 1963, D 1965, D 1966, and D 2090, which provide test procedures for various properties such as flash point, specific gravity, acid value, and color.
Note: Raw linseed oil is a natural product. In unusual crop years, color, iodine value, and acid value may vary from stated limits. Such deviations should be agreed upon between purchaser and supplier per Note 1 of the standard.
📊 Properties and Specifications
Raw linseed oil must conform to the physical and chemical requirements listed in Table 1 of the standard. These properties ensure consistent performance in drying oil applications. The table below summarizes the key limits and associated test methods.
| 🟦 Property | 📏 Requirement | 🔬 ASTM Method |
|---|---|---|
| Specific gravity, 25/25°C | 0.926 to 0.931 | D 1963 |
| Acid value, max | 4.0 | D 1639 |
| Saponification value | 189.0 to 195.0 | D 1962 |
| Unsaponifiable matter | As specified in standard | D 1965 |
Additional properties like color (per D 1544) and foots content (per D 1954 or D 1966) are referenced but not explicitly limited in the table. The standard emphasizes that raw linseed oil is a natural product, requiring flexibility in specification limits during unusual crop years.
🔬 Test Methods and Compliance
Sampling must follow Test Method D 1466 for liquid oils and fatty acids. All properties shall be determined using the applicable ASTM methods listed in Table 1. Guide D 555 provides discussion on the significance of these test methods for drying oils. For clarity and cleanness, refer to Test Method D 2090. Compliance with these methods ensures reliable and reproducible results for raw linseed oil.
Sampling caution: Proper sampling is critical per D 1466 to avoid contamination. Ensure samples are representative of the bulk oil to guarantee accurate property verification.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D234?
ASTM D234 covers raw linseed oil, defining its properties and test methods. It applies to oil obtained from flaxseed used in paints, varnishes, and coatings.
💡 Why is specific gravity important for raw linseed oil?
Specific gravity (0.926 to 0.931 at 25/25°C) indicates oil purity and consistency. It is measured per D 1963 and helps verify that the oil meets density standards for industrial use.
⚡ How should variations in properties be handled?
Due to natural crop variations, acid value, iodine value, and color may differ from limits. Such variances require mutual agreement between purchaser and supplier, as stated in Note 1.
📌 What test method is used for saponification value?
The saponification value (189.0 to 195.0) is determined using Test Method D 1962, which measures the alkali required to saponify the oil, reflecting fatty acid composition.