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D1766-05 – Standard Test Method Technical Guide
📜 Scope and Significance
The ASTM D1766-05 (Reapproved 2021) standard provides a practical test method for determining the solubility of commercial chemicals used in rubber products. This method is specifically designed as a raw material quality-control tool (Section 4.1) and is not a rigorous determination of thermodynamic solubility. It measures the total solubility of all components in the proportions present under the test conditions.
⚠️ Application Limitation: This test method explicitly does not measure the solubility of a rubber chemical in rubber (Section 1.4). It assesses solubility in specific organic solvents under controlled laboratory conditions. Users must establish appropriate safety practices before use (Section 1.6).
⚙️ Test Procedure and Conditions
The procedure involves preparing a saturated solution by shaking the test specimen in a specified volume of solvent, followed by a settling period. A clear aliquot of the supernatant solution is then evaporated to determine the mass of dissolved solids (Section 3.1).
Required Apparatus
| 🟦 Apparatus | 📏 Specification |
|---|---|
| Container | 100 cm³ (4-oz) glass bottle with screw cap and metal foil liner |
| Weighing Bottle | 50 cm³, ground-glass, low-form with cover |
| Oven | Constant-temperature, Type B per E145, 110°C max |
Procedure Steps
| 📐 Step | 🎯 Action | ⚡ Condition |
|---|---|---|
| 1 | Place 50 cm³ of solvent in a container. Add test specimen to saturation plus 25% excess. | Shake mechanically for a minimum of 4 h at room temperature. |
| 2 | Hold the mixture and shake occasionally. | Minimum of 4 h at 23 ± 0.5 °C. |
| 3 | Allow solids to settle. Remove 25 cm³ aliquots
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