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D1760-01 – Standard Test Method Technical Guide
📐 Scope and Terminology
ASTM D1760 – 01, Standard Specification for Pressure Treatment of Timber Products, establishes the requirements for treating round, sawn, and otherwise fabricated timber products—including utility poles, piles, posts, crossties, lumber, timbers, glued laminated timbers, and plywood—with preservative materials in a closed vessel under pressure. The standard defines preservative materials and solutions as substances that protect wood from the destructive action of fungi, insects, and marine borers when injected into the wood structure.
This specification is divided into two general sections: Sections 1 through 9 provide the baseline technical requirements relating to all species and commodities, while Tables 1 through 7 detail specific requirements for individual species and commodities. The values stated in inch-pound units are to be considered as standard for this specification (Section 1.3).
📋 Referenced Preservative and Solvent Specifications
D1760 relies on a comprehensive set of ASTM standards for the specification and testing of preservative materials. All treatment must comply with the applicable material specification and the corresponding commodity table. A selection of key referenced documents is provided below.
| 🟦 Preservative / Solvent Material | 📏 ASTM Specification |
|---|---|
| Coal-Tar Creosote (for Piles, Poles, and Timbers) | D 390 |
| Creosote-Coal Tar Solution | D 391 |
| Pentachlorophenol | D 1272 |
| Ammoniacal Copper Arsenate & Ammoniacal Copper Zinc Arsenate | D 1325 |
| Acid Copper Chromate | D 1624 |
| Chromated Copper Arsenate (CCA) | D 1625 |
| Creosote-Petroleum Solution | D 1858 |
| High-Boiling Hydrocarbon Solvent (Oil-Borne) | D 2604 |
| Volatile Petroleum Solvent (LPG for PCP Solutions) | D 2605 |
| Low-Boiling Hydrocarbon Solvent (Oil-Borne) | D 3225 |
| Copper bis(Dimethyldithiocarbamate) | D 5653 |
| Ammoniacal Copper Quat Type B (ACQ-B) | D 5654 |
💡 Practical Note: The list of referenced standards in D1760 also includes critical chemical analysis methods (e.g., D 1326, D 1627, D 1628, D 2085, D 5584, D 5655) and test methods for moisture and preservative content (D 1860). Always verify the latest editions of these standards for current testing and analysis protocols.
⚙️ General Requirements for Treating Phases
Section 4 of the standard establishes the fundamental process boundaries for all treating phases. Unless explicitly modified or supplemented by the commodity-specific tables, the following general requirements apply to every species and treatment process.
| 📐 Treating Phase Parameter | 🎯 Core Requirement | ⚡ Description (D1760, Section 4.1.1) |
|---|---|---|
| Maximum Time Duration | Shall not be exceeded | Total elapsed time for a specific treating phase. |
| Maximum Temperature | Shall not be exceeded | Critical limit to prevent wood degradation and maintain preservative stability. |
| Maximum Pressure | Shall not be exceeded | Ensures material integrity and overall process safety. |
| Phase Definition | Condition-driven start & end | Phase begins when a change in cylinder conditions is initiated; ends when new conditions are imposed or the cylinder is emptied of preservative. |
⚠️ Critical Requirement for Specifiers: Section 4.1 explicitly states that if these general requirements are to be modified to meet special conditions, complete detailed instructions shall be given by the purchaser or specifier. The requirements in Tables 1–7 for specific species and commodities vary widely, so great care must be exercised in applying them to specific instances.
For every treating phase defined by the standard, strict adherence to the established maximum limits for time, temperature, and pressure is mandatory. These general provisions form the backbone of the cycle specification, ensuring that pressure-treated timber products meet the necessary durability and structural performance criteria.
❓ Frequently Asked Questions
🔍 What specific products fall under the definition of “timber products”?
Per Section 3.1.2, timber products include round, sawn, and otherwise fabricated materials. Examples listed specifically in the standard include utility poles, piles, posts, crossties, lumber, timbers, glued laminated timbers (glulam), and plywood.
💡 How does D1760 define a “phase” within the treating cycle?
A treating phase is defined in Section 4.1.1 as the interval that begins when a change in conditions within the cylinder is initiated and ends when either new conditions are imposed or the cylinder is emptied of preservative.
⚡ What is the relationship between the general requirements and the commodity tables?
Sections 1–9 provide the baseline technical requirements covering all treatment scenarios. The specific commodity tables (Tables 1–7) serve to modify or supplement these general rules, providing tailored requirements for specific wood species and end-use commodities.
📌 Are SI or inch-pound units specified as the standard for this specification?
Section 1.3 clearly states that the values stated in inch-pound units are to be considered as standard for ASTM D1760 – 01.