Overview
EN 12047:1996 - "Solid fertilizers - Measurement of static angle of repose (ISO 8398:1989 modified)" is a CEN standard that describes a laboratory method to determine the static angle of repose of solid fertilizers. The procedure is intended for free-flowing fertilizers and sets applicability limits for particle size and measured angles. The standard is based on ISO 8398:1989 (modified) and is commonly referenced in fertilizer quality control and materials-handling specifications.
Key Topics
- Scope and applicability
- Method applies to free-flowing solid fertilizers.
- Not suitable for materials containing a large proportion of particles exceeding 5 mm diameter.
- The published scope states suitability for measuring static angles of repose greater than 20 °C (as written in the source text); users should verify the intended unit or check national errata or the original ISO text for clarification.
- Reference to ISO 8398
- Procedure is derived from and modified relative to ISO 8398:1989.
- Measurement focus
- Standard defines how to determine the static angle of repose, a key indicator of flowability and bulk behaviour of granular fertilizers.
- Limitations
- Intended only for free-flowing products; not suitable for coarse or highly cohesive materials.
Applications
- Quality control and product specification
- Use the angle-of-repose measurement to monitor batch-to-batch consistency and to support product claims about flow characteristics.
- Storage and handling design
- Inform hopper, silo and conveyor design by providing a parameter related to heap stability and flow.
- Packaging and logistics
- Assess potential handling issues (bridging, arching) during filling, transport and discharge operations.
- R&D and formulation
- Guide formulation changes and granulation processes to achieve desired flow properties.
- Laboratories and certification
- Adopted by testing labs, fertilizer producers, and inspection bodies for routine testing and compliance checks.
Related Standards
- ISO 8398:1989 - original international method on which EN 12047 is based (modified in the EN version).
- National adoptions and later revisions: check current CEN listings and national standards bodies for updated versions, national annexes, or errata.
Note: For implementation, consult the full EN 12047:1996 text or the relevant national adoption to ensure procedural details, apparatus specifications and any national modifications are followed.