Overview
ASTM E1520-23 is the Standard Test Method for Particle Counts Per Pound of Granular Carriers and Dry-Applied Granular Formulations, developed by ASTM International. This standard provides a method for determining the number of particles per pound of clay granular carriers and clay-based granular formulations, with applicability extending to other granular materials. Particle count analysis is essential in quality control, product formulation, and compliance within industries that use granular pesticides, fertilizers, and similar products.
This test method focuses on granules in the 6 to 80 mesh size range (3.36 to 0.17 mm). Results are expressed in SI units, and users must ensure appropriate safety, health, and environmental practices during testing.
Key Topics
- Applicability: Principally intended for clay granular carriers and clay-based formulations but suitable for other similar materials.
- Particle Size Range: Applicable to granules within 6 to 80 mesh (3.36 mm to 0.17 mm); users must specify the sieve sizes used for reporting.
- Testing Procedure:
- A known weight of the granular material is added to a series of stacked stainless-steel sieves, shaken for a specified time, and then weighed to determine the distribution across sieve sizes.
- The percentage and number of particles retained on each sieve are calculated to obtain the total particle count per pound.
- Calculation: The particle count is determined from the measured distribution, using multiplication factors based on sieve size and bulk density.
- Safety Guidance: Users must read precautionary statements related to the material. Proper personal protective equipment (PPE) and containment practices are required, especially for pesticide formulations.
- Limitations: Designed for spherical or near-spherical particles; use on non-spherical granules may result in inaccurate counts.
Applications
Employing ASTM E1520-23 enables laboratories, manufacturers, and quality control professionals to:
- Quality Control: Assess the consistency and suitability of granular carrier materials for pesticide, fertilizer, or similar granular formulations.
- Regulatory Compliance: Ensure product formulations comply with industry and environmental regulations by providing reliable particle count data.
- Process Optimization: Improve product performance and application by monitoring particle counts and size distribution, leading to enhanced uniformity and efficacy in final formulations.
- Research & Development: Compare different granular carriers or improve formulation processes by establishing standardized measurement practices.
- Material Comparison: Evaluate and qualify suppliers and batches of granular material based on quantifiable and repeatable particle counts.
Related Standards
For comprehensive analysis and consistency, ASTM E1520-23 should be used alongside these related ASTM standards:
- ASTM E11 - Specification for Woven Wire Test Sieve Cloth and Test Sieves
- ASTM E725 - Test Method for Sampling Granular Carriers and Granular Pesticides
- ASTM E726 - Test Method for Particle Size Distribution of Granular Carriers and Granular Pesticides
- ASTM E727/E727M - Test Methods for Determining Bulk Density of Granular Carriers and Granular Pesticides
These standards collectively provide guidance on sampling, particle size distribution, and bulk density, supporting reliable and consistent testing and reporting.
Keywords: ASTM E1520-23, particle count, granular carriers, clay-based granular formulations, sieve analysis, quality control, pesticide formulations, bulk density, mesh size, standard test method, particle size analysis.