ISO 11057:2011

Overview

ISO 11057:2011 - Air quality: Test method for filtration characterization of cleanable filter media specifies a standard reference test method for the comparative evaluation of pulse‑jet cleanable filter media used in dry gas cleaning (e.g., bag filters, pocket filters, cartridge filters). The standard defines a reference apparatus and operating method, the required test facility characteristics, test sequences, measured parameters and the processing/presentation of results. Results are intended to support selection, development and classification of filter media (including PM2.5-related checks), but are not intended to predict absolute full‑scale system performance.

Key technical topics and requirements

• Standard reference apparatus and procedure - a defined test rig and step‑by‑step method are given; other apparatus can be accepted only after comparison testing against the reference apparatus (clause 6.1).
• Measured parameters include: pressure drop, residual pressure drop after pulse cleaning, cycle time, dust collection efficiency, particle number/mass concentration in clean gas (emissions), and feed‑rate stability of test dust.
• Test conditions and facility characteristics - requirements for gas flows (nominal, operating, standard), dispersion air quality, mixing section homogeneity, environmental controls and calibration of particle counters/photometers.
• Aerosol and particle metrics - definitions and use of equivalent diameters (aerodynamic, light‑scattering, volume equivalent), particle size distributions and optical particle counters (OPC).
• Data processing and presentation - standardized procedures for evaluating and reporting filtration characterization results to allow comparative assessments.
• Limitations - the method provides comparative, standardized laboratory characterization; it is not a direct predictor of full‑scale filter installation performance or service life without further validation.

Practical applications and users

Who uses ISO 11057:

• Filter media manufacturers - to evaluate and develop media (filtration performance, cleanability, durability).
• Filter and equipment OEMs - for media selection and optimization of pulse‑jet cleaning parameters.
• Third‑party test laboratories and test houses - for comparative media classification and accreditation of equivalent test rigs.
• Industrial plant operators and environmental engineers - to assess emission characteristics (including PM2.5 tendencies) and to support filter maintenance planning.
• R&D teams - for controlled aging tests, lifetime projections and comparative performance studies.

Practical benefits:

• Enables consistent, repeatable comparison of cleanable filter media.
• Supports informed selection and optimization of filter systems and cleaning cycles.
• Provides standardized data useful for regulatory and procurement decisions.

Related standards

ISO 11057:2011 builds on and aligns with established methods such as VDI 3926 Part 1, ASTM D6830, JIS Z 8909‑1, and GB/T 6719, and should be used alongside relevant local air‑quality and emissions standards when assessing real‑world compliance.