ASTM D6738 Method for Precipitated Silica – Volatile Content
ASTM D6738 includes determining volatile content in precipitated silica. The volatile content of precipitated silica may affect the properties of a rubber mixture containing silica and the properties of the final product.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM D6738 is a test method for determining the volatile content of precipitated hydrated silicas. The volatility is primarily due to excess water adsorbed on the surfaces of the silica particles.
This test method provides a convenient and accurate means of determining volatile matter content by measuring weight loss during controlled heating and cooling. The value is given as a percentage and rounded to the nearest 0.1%. ASTM D6738 is widely used in quality control and material characterization of silica materials.
Scope, Applications, and Benefits
Scope
ASTM D6738 evaluates:
- Volatile content in precipitated hydrated silicas
- Surface-adsorbed moisture levels
- Material stability and consistency
- Quality variations in silica production
The method applies to precipitated silica materials with controlled particle-size distributions.
Applications
- Rubber and tire manufacturing
- Coatings and paints
- Adhesives and sealants
- Cosmetics and personal care products
- Chemical processing
- Quality control testing
- Research and development
Benefits
- Provides standardized volatile content data
- Supports process control
- Helps maintain consistent product quality
- Enables comparison between silica batches
- Cost-effective and straightforward testing method
- Improves material performance assessment
Test Process
Pan Weighing & Sample Addition
The empty pan is weighed (W₁), and the silica sample is added and reweighed (W₂).
1Heating
The sample is heated as specified to remove volatile content.
2Cooling & Final Weighing
Pan is cooled in a desiccator and reweighed after reaching room temperature (W₃).
3Calculation
Volatile content is calculated using the standard formula.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Precipitated hydrated silicas |
| Particle Size Range | 20 nm to 200 nm |
| Conditioning | Controlled temperature reaction |
| Output Units | % Volatiles |
Instrumentation Used for Testing
- Analytical balance
- Aluminum weighing pans
- Drying oven or heating apparatus
- Desiccator
- Temperature control system
- Data recording system
Results and Deliverables
- Volatile content percentage
- Batch comparison reports
- Quality control documentation
- Material stability assessment
Frequently Asked Questions
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