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D5654-95 – Standard Test Method Technical Guide
This specification defines the requirements for ammoniacal copper quat Type B (ACQ-B) solution used in wood preservative treatments. Issued under ASTM D 5654 – 95 (Reapproved 2000), the standard ensures consistent composition and performance for effective protection.
📐 Composition and Properties
The ACQ-B solution is formulated with bivalent copper and didecyldimethylammonium chloride (DDAC). Per Section 3.1, the ingredients must be present in the following proportions: copper calculated as CuO at 66.7% by weight and quat as DDAC at 33.3% by weight. These are dissolved in an aqueous ammonia solution, with the ammonia weight at least 1.0 times the copper oxide weight. Additionally, carbonate anions, often from ammonium bicarbonate, must be included at a level of at least 0.65 times the copper oxide weight (Section 3.2).
📊 Composition Limits and Tolerances
The composition may vary within specified limits as per Section 3.3. Deviations outside these limits are permitted under Section 3.4 provided that retention is determined by assay and immediate corrective action is taken.
| 🟦 Component | 📏 Minimum (%) | 📐 Maximum (%) |
|---|---|---|
| Copper as CuO | 62.0 | 71.0 |
| Quat as DDAC | 29.0 | 38.0 |
📌 Purity Requirement: The treating solution must contain bivalent copper and quaternary ammonium compounds with purity exceeding 95% on an anhydrous basis (Section 3.5). This ensures high-quality preservative action.
⚙️ Chemical Analysis and Compliance
Chemical analysis of ACQ-B must be performed in accordance with ASTM Test Methods D 5584 (Section 4.1). This standard ensures accurate determination of active ingredient levels. The keywords associated with this specification include ACQ-B, ammoniacal copper quat, and preservative.
⚡ Deviation Alert: If the treating solution composition falls outside the limits in the table, immediate adjustment is required. Assay results must confirm minimum active ingredient levels as per Table 1 of the standard (Section 3.4).
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D5654-95? This specification covers ammoniacal copper quat Type B (ACQ-B) solution for use in the preservative treatment of wood.
💡 What are the primary ingredients in ACQ-B? The primary ingredients are copper, calculated as CuO (66.7% by weight), and quat as didecyldimethylammonium chloride (DDAC) (33.3% by weight).
⚡ What are the allowed composition tolerances? Copper as CuO can range from 62.0% to 71.0%, and quat as DDAC from 29.0% to 38.0% (Section 3.3).
📌 How is the preservative analyzed for compliance? The material must be analyzed in accordance with ASTM Test Methods D 5584 to ensure it meets the specified requirements.