ISO 8486-2:2007 PDF

Bonded abrasives — Determination and designation of grain size distribution — Part 2: Microgrits F230 to F2000

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Title (English):

ISO 8486-2:2007

Bonded abrasives — Determination and designation of grain size distribution — Part 2: Microgrits F230 to F2000

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 32
Publication date:: July 25, 2007
Edition:: ISO IS 8486 edition 2 version 1
ICS:: 25.100.70

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Description (English):

ISO 8486-2:2007 sets forth a method for determining or checking the size distribution of microgrits F230 to F2000 in fused aluminium oxide and silicon carbide. It specifies the grit designation for the testing of those grits used in the manufacture of bonded abrasive products and general industrial applications and those removed from bonded products, as well as loose grits used in polishing.

Technical details

Technical committee: ISO/TC 29/SC 5 - Grinding wheels and abrasives
SKU: ISO 8486-2:2007

Abstract

Overview

ISO 8486-2:2007 specifies how to determine and designate the grain size distribution of microgrits (F230 to F2000) used in bonded abrasives. The standard covers fused aluminium oxide and silicon carbide microgrits used in manufacturing bonded abrasive products, loose polishing grits, and grits recovered from bonded products. ISO 8486-2 defines a graduated F-series (thirteen microgrits) with median sizes from about 53 µm down to 1.2 µm, and sets the sedimentation-based test procedures and acceptance criteria for each grade.

Key topics and technical requirements

Scope and definitions: Microgrits are defined as grits with median grain sizes (d50) of 60 µm or less determined by sedimentation.
Grain size criteria: Three simultaneous criteria govern conformity:
- maximum permissible theoretical diameter at the 3% (d3) point;
- median theoretical diameter at the 50% (d50) point (must fall within specified tolerances);
- minimum attainment at the 80% and 94/95% (d80, d94/95) points.
Test methods: Primary methods are sedimentation-based:
- Photosedimentometer methods using Micro‑F‑Mastergrits (mastergrit calibration);
- US sedimentation tube method and related sedimentation analyses;
- Examples also include Sedigraph/X‑ray gravitational instruments and Coulter counters (as instrument types to indicate in test designation).
Calibration and correction: Use of certified Micro‑F‑Mastergrits (MPA Darmstadt certificates) to correct instrument bias - measured d50 differences are algebraically applied to sample results.
Sample preparation: Dispersion by ultrasonics is recommended.
Permissible deviations: Tables provide measurement tolerance allowances to account for sampling and instrument variability; these are added to the tabulated limits for compliance.
Annexes: Informative material includes an electrical resistance method, record forms for sedimentation results, and example data presentation.

Overview

Key topics and technical requirements

Scope and definitions: Microgrits are defined as grits with median grain sizes (d50) of 60 µm or less determined by sedimentation.
Grain size criteria: Three simultaneous criteria govern conformity:
- maximum permissible theoretical diameter at the 3% (d3) point;
- median theoretical diameter at the 50% (d50) point (must fall within specified tolerances);
- minimum attainment at the 80% and 94/95% (d80, d94/95) points.
Test methods: Primary methods are sedimentation-based:
- Photosedimentometer methods using Micro‑F‑Mastergrits (mastergrit calibration);
- US sedimentation tube method and related sedimentation analyses;
- Examples also include Sedigraph/X‑ray gravitational instruments and Coulter counters (as instrument types to indicate in test designation).
Calibration and correction: Use of certified Micro‑F‑Mastergrits (MPA Darmstadt certificates) to correct instrument bias - measured d50 differences are algebraically applied to sample results.
Sample preparation: Dispersion by ultrasonics is recommended.
Permissible deviations: Tables provide measurement tolerance allowances to account for sampling and instrument variability; these are added to the tabulated limits for compliance.
Annexes: Informative material includes an electrical resistance method, record forms for sedimentation results, and example data presentation.

ISO 8486-2:2007 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Abstract

Overview

Key topics and technical requirements

Applications and users

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