Near-White Blast Cleaning

1 sspc -SP 10/NACE No. 2 September 1, 200072 Joint Surface Preparation StandardSSPC-SP NO. 10/NACE NO. 2 Near-White Blast CleaningThis sspc : The Society for Protective Coatings andNACE International standard represents a consensus ofthose individual members who have reviewed this docu-ment, its scope and provisions. Its acceptance does not inany respect preclude anyone, having adopted the standardor not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not in conformance withthis standard. Nothing contained in this standard is to beconstrued as granting any right, by implication or otherwise,to manufacture, sell, or use in connection with any method,apparatus, or product covered by Letters Patent, or asindemnifying or protecting anyone against liability for in-fringement of Letters Patent.

2 This standard representsminimum requirements and should in no way be interpretedas a restriction on the use of better procedures or is this standard intended to apply in all casesrelating to the subject. Unpredictable circumstances maynegate the usefulness of this standard in specific and NACE assume no responsibility for the interpre-tation or use of this standard by other parties and acceptresponsibility for only those official interpretations issued bySSPC or NACE in accordance with their respective govern-ing procedures and policies, which preclude the issuance ofinterpretations by individual of this standard are responsible for reviewingappropriate health, safety, and regulatory documents andfor determining their applicability in relation to this standardprior to its use.

3 This sspc /NACE standard may not neces-sarily address all potential health and safety problems orenvironmental hazards associated with the use of materials,equipment and/or operations detailed or referred to withinthis standard. Users of this standard are also responsible forestablishing appropriate health, safety, and environmentalprotection practices, in consultation with appropriate regu-latory authorities, if necessary, to achieve compliance withany existing applicable regulatory requirements prior to theuse of this NOTICE: sspc /NACE standards aresubject to periodic review and may be revised or withdrawnat any time without prior notice.

4 sspc and NACE requirethat action be taken to reaffirm, revise, or withdraw thisstandard no later than five years from the date of initialpublication. The user is cautioned to obtain the latestedition. Purchasers may receive current information on allstandards and other publications by contacting the organi-zations at the addresses below: NACE Box 218340 Houston, TX 77218-8340(telephone +1 281/228-6200) sspc : The Society for Protective Coatings40 24th Street, Sixth FloorPittsburgh, PA 15222(telephone +1 412/281-2331)ForewordThis joint standard covers the use of Blast cleaningabrasives to achieve a defined degree of Cleaning of steelsurfaces prior to the application of a protective coating orlining system.

5 This standard is intended for use by coatingor lining specifiers, applicators, inspectors, or others whoseresponsibility it may be to define a standard degree ofsurface focus of this standard is Near-White metal blastcleaning. white metal Blast Cleaning , commercial blastcleaning, industrial Blast Cleaning and brush-off Blast clean-ing are addressed in separate Blast Cleaning provides a greater degree ofcleaning than commercial Blast Cleaning ( sspc -SP 6/NACENo. 3), but less than white metal Blast Cleaning ( sspc -SP 5/NACE No. 1). Near-White Blast Cleaning is used when the objective isto remove all rust, coating, and mill scale, but when the extraeffort required to remove all stains of these materials isdetermined to be unwarranted.

6 Staining shall be limited tono more than 5 percent of each unit area of Blast Cleaning allows staining on only 5percent of each unit area of surface, while commercial blastcleaning allows staining on 33 percent of each unit area ofsurface. white metal Blast Cleaning does not permit anystaining to remain on the joint standard was prepared by the sspc /NACETask Group A on Surface Preparation by Abrasive BlastCleaning. This joint Task Group includes members of boththe sspc Surface Preparation Committee and the NACEUnit Committee T-6G on Surface 10/NACE No. 2 September 1, 2000731. This joint standard covers the requirements fornear- white Blast Cleaning of unpainted or painted steelsurfaces by the use of abrasives.

7 These requirementsinclude the end condition of the surface and materials andprocedures necessary to achieve and verify the end This joint standard allows random staining toremain on no more than 5 percent of each unit area ofsurface as defined in Section The mandatory requirements are described inSections 1 to 9 as follows:Section 1 GeneralSection 2 DefinitionSection 3 ReferencesSection 4 Procedures Before Blast CleaningSection 5 Blast Cleaning Methods and OperationSection 6 Blast Cleaning AbrasivesSection 7 Procedures Following Blast Cleaning andImmediately Prior to CoatingSection 8 InspectionSection 9 Safety and Environmental RequirementsNOTE.

8 Section 10, Comments and Appendix A, Explana-tory Notes are not mandatory requirements of this A Near-White metal Blast cleaned surface, whenviewed without magnification, shall be free of all visible oil,grease, dust, dirt, mill scale, rust, coating, oxides, corrosionproducts, and other foreign matter, except for staining asnoted in Section Random staining shall be limited to no more than 5percent of each unit area of surface as defined in , and may consist of light shadows, slight streaks, orminor discolorations caused by stains of rust, stains of millscale, or stains of previously applied Acceptable variations in appearance that do notaffect surface cleanliness as defined in Section includevariations caused by type of steel, original surface condi-tion, thickness of the steel, weld metal, mill or fabricationmarks, heat treating, heat affected zones, blasting abra-sives, and differences in the Blast When a coating is specified, the surface shall be rough-ened to a degree suitable for the specified coating Immediately prior to coating application.

9 The entiresurface shall comply with the degree of Cleaning Unit area for determinations shall be approximately5776 mm2 (9 in2) ( , a square 76 mm x 76 mm [3 in x 3 in]). sspc -VIS 1-89, photographs A SP-10, B SP-10, CSP-10 or D SP-10 may be specified to supplement thewritten definition. In any dispute, the written standards shalltake precedence over visual standards and information on visual standards and comparatorsis available in Section of Appendix The documents referenced in this standard arelisted in Section The latest issue, revision, or amendment of thereferenced standards in effect on the date of invitation to bidshall govern unless otherwise If there is a conflict between the requirements of anyof the cited reference standards and this standard, therequirements of this standard shall sspc : THE SOCIETY FOR PROTECTIVE COAT-INGS STANDARDS.

10 AB 1 Mineral and Slag AbrasivesAB 2 Cleanliness of Recycled Ferrous MetallicAbrasivesAB 3 Newly Manufactured or Re-ManufacturedSteel AbrasivePA Guide 3A Guide to Safety in Paint ApplicationSP 1 Solvent CleaningVIS 1 Visual Standard for Abrasive Blast CleanedSteel4. Procedures Before Blast Before Blast Cleaning , visible deposits of oil, grease,or other contaminants shall be removed in accordance withSSPC-SP 1 or other agreed upon Before Blast Cleaning , surface imperfections suchas sharp fins, sharp edges, weld spatter, or burning slagshould be removed from the surface to the extent requiredby the procurement documents (project specification).