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D2857-22 – Standard Test Method Technical Guide
📐 Scope and Applicability
ASTM D2857-22 is a standard practice for determining the dilute solution viscosity of polymers. It serves as a universal guide applicable to all polymers that can be completely dissolved without chemical reaction or degradation, forming solutions stable over time at temperatures ranging from ambient to 150°C.
This practice is designed to augment existing test methods for specific materials, including nylon (Test Methods D789), poly(vinyl chloride) (Test Methods D1243 and D3591), polyethylene (Test Method D1601), and poly(ethylene terephthalate) (Test Method D4603). It is particularly useful when troubleshooting issues or characterizing polymers not covered by a dedicated standard.
⚙️ Key Measured Properties and Nomenclature
The standard defines three primary viscosity measurements for characterizing polymer solutions. The table below summarizes the nomenclature used in the practice.
| 🟦 Primary Term | 📏 Alternative Term | 🎯 Description |
|---|---|---|
| Relative Viscosity | Viscosity Ratio | The ratio of the solution viscosity to the pure solvent viscosity. |
| Inherent Viscosity | Logarithmic Viscosity Number | The natural logarithm of the relative viscosity divided by
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