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D1858-63 – Standard Test Method Technical Guide
ASTM D1858–63 (Reapproved 2000) specifies the requirements for creosote-petroleum solution, a blend used in the preservative treatment of timber. The standard defines the composition, referencing ASTM D390 for coal-tar creosote and ASTM D1859 for petroleum, and mandates a minimum creosote content of 50% by volume. Due to the lack of post-blending analysis methods, components must be tested individually before mixing.
📐 Composition and Specifications
Section 3.1 of the standard outlines the composition: the creosote-petroleum solution must consist of coal-tar creosote conforming to ASTM D390 and petroleum conforming to ASTM D1859, with not less than 50 volume percent of creosote. The table below summarizes the component requirements.
| 🟦 Component | 📏 Referenced Standard | 📐 Requirement |
|---|---|---|
| Coal-Tar Creosote | ASTM D390 | Conforms to Specification D390 |
| Petroleum for Blending | ASTM D1859 | Conforms to Specification D1859 |
| Creosote Content (Final Solution) | — | Not less than 50% by volume |
⚙️ Pre-Blending Analysis Requirements
Per Section 4.1, once the materials have been blended, there is no existing standard method to determine the relative amounts of the components. Therefore, each component must be analyzed separately before blending to ensure conformance to the respective specifications. This pre-blending analysis is critical for quality assurance.
⚠️ Warning: No standard test method exists for verifying the component ratio after blending. Always perform individual component testing before mixing.
💡 Technical Note: Ensure that both the creosote and petroleum meet their respective ASTM specifications (D390 and D1859) prior to blending to maintain solution integrity.
❓ Frequently Asked Questions
🔍 What is the minimum creosote content required in the solution?
The standard specifies that the creosote-petroleum solution must contain not less than 50% by volume of creosote (Section 3.1).
💡 Can the blended solution be tested for component ratios?
No. Section 4.1 states that once blended, there is no standard method to determine the relative amounts of creosote and petroleum.
⚡ Which ASTM standards are referenced for the components?
The standard references ASTM D390 for coal-tar creosote and ASTM D1859 for petroleum (Section 2.1).
📌 What is the scope of this specification?
As per Section 1.1, this specification covers creosote-petroleum solution for use in the preservative treatment of timber.