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D6419-00 – Standard Test Method Technical Guide
📐 Scope and Summary of Test Method
ASTM D6419-00 (Reapproved 2023), issued under the fixed designation D6419, provides the specific procedure for determining the weight percent volatile content of sheet-fed and coldset (non-heatset) web offset printing inks and their vehicles. Under the jurisdiction of D01.56 on Printing Inks, this method is the procedure of choice for these materials, which typically contain a wide range of high-boiling hydrocarbons and often exhibit a volatile content below 25%.
The test method works by precisely weighing a specimen, dispersing it in toluene, and heating it in a controlled oven to drive off volatiles. The percent volatile is calculated from the loss in weight. It is based on Test Method D2369 but imposes tighter parameters to improve precision for offset inks.
💡 Critical Distinction from D2369: Interlaboratory studies confirmed that the tolerances in D2369 (±0.1 g specimen weight, ±5 °C oven temperature) were insufficient for the precision required by sheet-fed and coldset web offset inks. D6419-00 mandates a specimen weight of 0.300 g ± 0.001 g and an oven temperature of 110 °C ± 1 °C.
⚙️ Test Procedure and Instrumentation
The test procedure mandates rigorous control of sample mass and thermal conditions to ensure reproducibility. A specimen of 0.300 g ± 0.001 g is weighed into an aluminum foil dish. The ink is then dispersed in 3 mL of toluene to ensure volatile components are not trapped during heating. The dish is placed in a gravity-convection or forced-ventilation oven (meeting Specification E145) preheated and stabilized at 110 °C ± 1 °C for exactly 60 minutes. Following the heating period and cooling, the residue is reweighed to calculate the volatile content by loss in mass.
🔬 Critical Test Parameter Comparison
| 🟦 Parameter | 📏 D6419-00 Requirement | ⚡ D2369 Requirement |
|---|---|---|
| Specimen Mass | 0.300 g ± 0.001 g | 0.3 g ± 0.1 g |
| Solvent Dispersion | 3 mL Toluene | 3 mL Toluene |
| Oven Temperature | 110 °C ± 1 °C | 110 °C ± 5 °C |
| Heating Duration | 60 Minutes | 60 Minutes |
📊 Key Measured Properties and Significance
The primary measurable property is the weight percent volatile content. This data is critically important for multiple stakeholders in the printing industry:
- Ink Manufacturers: Validation of product formulations and batch-to-batch quality control.
- Printers: Assessment of ink drying characteristics and performance in non-heatset and sheet-fed processes.
- Environmental Compliance: The volatile content is a fundamental factor in determining the mass of volatile organic compounds (VOCs) emitted, aligning with protocols such as EPA Reference Method 24.
⚠️ Material Exclusion: Section 1.3 of the standard explicitly states this test method is not applicable to ultra-violet (UV) or electron beam (EB) cured materials. These systems require reactive curing via UV light or an electron beam to determine volatile content properly and cannot be assessed using this thermal oven method.
🎯 Applicability Guide
| 🎯 Material Type | 🟦 Status | 📝 Key Notes |
|---|---|---|
| Sheet-Fed Offset Printing Inks | Applicable | Primary validated application of the method. |