ISO 8503-1-2012 pdf download.Preparation of steel substrates before application of paints and related products – Surface roughness characteristics of blast-cleaned steel substrates – Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces.
This part of ISO 8503 specifies the requirements for ISO surface profile comparators, which are intended for visual and tactile comparison of steel substrates which have been blast-cleaned with either shot abrasives or grit abrasives. This part of ISO 8503 also includes definitions of the terms used in the ISO 8503 series and requirements for the care of ISO surface profile comparators.
NOTE 1 ISO surface profile comparators are used for assessing, on site, the roughness of surfaces before the application of paints and related products or other protective treatments.
NOTE 2 Where appropriate, those ISO comparators can be used for assessing the roughness profile of other abrasive blast-cleaned substrates and, in addition, their use is not restricted solely to surfaces that are to be painted.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates alter overall removal of previous coatings
ISO 8503-2, Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 2: Method for the grading of surface profile of abrasive blast-cleaned steel — Comparator procedure
ISO 8503-3, Preparation of steel substrates before application of paints arid related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 3: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Focusing microscope procedure
ISO 8503-4, Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 4: Method for the calibration of ISO surface profile comparators and for the determination of surface profile — Stylus instrument procedure
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 surface profile
micro-roughness of a surface
NOTE This is generally expressed as the height of the major peaks relative to the major valleys. This term is defined in ISO 4287 as a “profile that results from the intersection of the real surface by a specified plane. Characteristics of the roughness of blast-cleaned surfaces are defined in 3.7, 38, 3.10 to 3.12 and in ISO 8503-4.
3.2 ISO surface profile comparator
planar plate of four segments on which are imparted reference surface profiles (3.1)
NOTE The reference surface profiles are prepared by forming, on a corrosion-resistant metal, positive replicas of an appropriately blast-cleaned mild steel coupon (3.3) (see Clause 4).
3.3 coupon
mild steel flat plate of four segments and of sufficient gauge such that blast-cleaning does not cause distortion
3.4 surface profile comparator
specimen surface, or surface of known average profile, representing a particular abrasive blast-cleaning process
NOTE The comparator is used to give guidance on the appearance and feel of an abrasive b’ast-cleaned surface and to enable an assessment to be made of the profile of the surface.
3.5 grit comparator ISO Comparator G comparator with surface profiles (3.1) corresponding to (or simulating) surfaces obtained by abrasive blastcleaning with metallic or mineral grit
3.6 shot comparator ISO Comparator S comparator with surface profiles (3.1) corresponding to (or simulating) surfaces obtained by abrasive blastcleaning with metallic shot.
4 Iso surface profile comparators
ISO surface profile comparators shall be planar and shall have the dimensions given in Figure 1. The segments shall conform to the values given in Table 1 where measured in accordance with the methods described in ISO 8503-3 or ISO 8503-4. The visual assessment (of the ISO comparator) shall not be inferior to preparation grade Sa 21/2 of ISo 8501-1.
ISO surface profile comparators shall be manufactured by forming positive replicas from nickel or other corrosion-resistant metals using master coupons prepared from mild steel.ISO 8503-1 pdf free download.