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D1243-22 – Standard Test Method Technical Guide
🔬 Scope and Significance of D1243-22
The ASTM D1243-22 standard specifically addresses the determination of the dilute solution viscosity of vinyl chloride polymers using cyclohexanone as the solvent. The result is reported as the inherent viscosity (logarithmic viscosity number). This value is critically linked to the average molecular size of the polymer fraction that successfully dissolves in the specified solvent, providing an essential quality control metric for PVC resins.
This test method is strictly limited to materials that form clear, uniform solutions at the test dilution. It is essential to note that while this standard shares a subject with ISO 1628-2, the technical contents differ significantly.
⚙️ Test Method and Calculation
The core procedure involves dissolving a sample of the resin in cyclohexanone to achieve a solution of a specific, controlled concentration. The inherent viscosity is then calculated from the measured flow times of the pure solvent and of the resulting polymer solution. These measurements require specific equipment adhering to several other ASTM standards.
📌 Editorial Note: The equation in Section 9.1 of the standard received an editorial correction in October 2023. Ensure you are using the most current version of the standard for calculations.
⚠️ Safety and Compliance: This standard does not purport to address all safety concerns. It is the responsibility of the user to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
📐 Essential Equipment and References
Successfully conducting D1243-22 requires strict adherence to specifications outlined in a family of supplementary standards.
| 🟦 Equipment / Material | 📏 Governing Document © 2026 TNLab — This article is a technical interpretation for reference only. The original standard as published by ASTM International takes precedence. 📥 Standard Documents Download |
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