When it comes to sieves, there are two main standards: ASTM and ISO/BS. These standards have some key differences that can affect your particle size analysis.
4 Key Differences Between ASTM and ISO/BS Standards Sieves
1. Measurement Units for Sieve Diameters
- ASTM Standards: Sieve diameters are measured in inches.
- ISO/BS Standards: Sieve diameters are measured in millimeters.
2. Sieve Diameter Measurements
- ASTM Standards: Common diameters include 8 inches and 12 inches.
- ISO/BS Standards: Corresponding measurements are 200 mm and 300 mm.
- Comparison: There is a slight discrepancy in actual measurements. An 8-inch ASTM sieve is equivalent to 203 mm, not 200 mm. A 12-inch sieve is 305 mm, not 300 mm. This means that sieves with nominal diameters of 8 inches and 200 mm, or 12 inches and 300 mm, cannot be nested due to dimensional differences.
3. Mesh Numbers vs. Wire Spacing
- ASTM Standards: Mesh numbers indicate the number of wires per inch (25.4 mm). This system is based on the density of the wire mesh.
- ISO/BS Standards: These standards use wire spacing, which directly measures the distance between the wires. This method provides a more direct measurement of the sieve's opening size.
4. Distinct Approaches in Defining and Manufacturing Test Sieves
- Both ASTM and ISO/BS standards aim to provide accurate and reliable tools for particle size analysis.
- The choice between ASTM and ISO/BS sieves depends on the specific requirements of the testing environment and the materials being tested.
- It is crucial for laboratories and testing facilities to ensure they are using the appropriate sieves based on the standards relevant to their operations and the regulatory requirements they must adhere to.
Continue Exploring, Consult Our Experts
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