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D563-88 – Standard Test Method Technical Guide
This article provides a technical overview of ASTM D563-88 (Reapproved 1996)e1, the standard test method for determining the phthalic anhydride content of alkyd resins and resin solutions. The method is widely used in the coatings industry for quality control and formulation analysis.
📐 Scope and Limitations
The phthalic anhydride content is a critical parameter that directly controls the properties of the final film for alkyd-based coatings. This standard is specifically applicable to alkyd resins and resin solutions, including those modified with styrene.
⚠️ Important Restriction: This test method is explicitly not suitable for alkyd resins containing other dibasic acids such as maleic or fumaric, or for resins modified with urea, melamine, or phenolic resins. The presence of these modifiers interferes with the chemical determination and will yield inaccurate results.
⚙️ Apparatus and Reagent Specifications
Compliance with this standard requires strict adherence to specific laboratory apparatus and high-purity reagents. All reagents must meet the specifications of the Committee on Analytical Reagents of the American Chemical Society, and water must be Type II reagent water per Specification D1193.
| 🟦 Component | 📏 Specification |
|---|---|
| Reaction Vessel | 500 mL
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