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 Surface preparation:

refers to the elimination of dirt, debris, paint, rust, concrete..or other contaminates leaving the surface in an ideal state for the application of future coating or bonding. When Sandblasting steel for the purpose of coatings applications the sandblaster needs to follow specific specifications provided by the coatings manufacturer. Steel surface preparation standards measure two critical specifications : Surface profile and Degrees of Cleanliness.

 

Surface Profile:

Profile refers the scratch depth that the abrasive leaves on the steel surface. Abrasives cut into the steel forming peaks and valleys. The depth of the profile is controlled by the size of the abrasive, angle of nozzle, distance of nozzle to surface and compressed air flow. The profile provides a mechanical method of positive, uniform bonding between the coating and the surface.

 

Coating manufacturers test their coatings on various profiles making sure that their products perform as intended. Adhesion and performance of coatings are guaranteed if specifications are followed. Contractors must adhere to these specifications. When profiles exceed the maximum specifications, the peaks may protrude through the coating system, causing it to fail. 

 

Sandblasting Steel: removes rust, dirt, concrete, debris and other contaminates. Sandblasting new steel removes the mill scale. Blasted surface leaves profile.

 

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The following information was collected from the SSPC website.
 
(link provided will conect you to their website)
 
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( SSPC ) The Steel Structures Painting Council

Contact SSPC  http://www..sspc.org/contact.html

Phone
Toll Free: 1.877.281.7772 (US Only)
All Others: 1.412.281.2331

FAX
Administrative: 412.281.9992
Certification, Conferences, Training: 412.281.9993
Publications, Membership: 412.281.9995

 
Degrees of Cleanliness

The Steel Structures Painting Council (SSPC) has established four degrees of cleanliness for blasting, ranging from removal of all contaminants to removal of loos materials only. The four degrees are White Metal Blast, Near White Metal Blast, Commercial Blast, and Brush off Blast For detailed descriptions of each refer to the SSPC's Visual Standards for Abrasive Blast Cleaned Steel.

White Metal Blast

Viewed without magnification, a shite metal blast cleaned surface is free of all visible rust, mill scale, paint, and foreign mater. This degree of cleanliness is usually required where sophisticated points; such as, zinc-rich coatings, will be applied to surfaces exposed to highly corrosive environments. Chemical plants, offshore drilling rigs, and bridges over salt water are typical applications.

Near White Metal Blast

Viewed without magnification, at least 95% of the surface is free of all visible residue after blast cleaning. This is similar to White Metal but some slight staining on the metal is allowed. This degree of cleaning is required where high performance coatings will be applied to steel exposed to harsh elements and heavy usage.

Commercial Blast

Viewed without magnification, at least two thirds of a commercial blast cleaned surface is free of visible residue. It allows some tightly adhering old paint to remain, based on the premise that paint adheres after blasting is unlikely to fail. For most applications where standard coatings will be applied, commercial blast is specified.

Brush Off Blast

Viewed without magnification a brush off blast cleaned surface may have only tightly adhering residues of mill scale, rust, and coatings remaining and must have numerous evenly distributed flecks of underlying metal exposed. This method is acceptable for surfaces not subjected to sever environments or where long-term coating life is not expected


 

Degrees of Cleanliness

SSPC Std.

NACE Std.

SIS Std.

White Metal Blast

SSPC-SP 5

NACE No. 1

SA-3

Near White Metal Blast

SSPC-SP 10

NACE No. 2

SA-2 1/2

Commercial Blast

SSPC-SP 6

NACE No. 3

SA-2

Brush-off Blast

SSPC-SP 7

NACE No. 4

SA-1

 
 
 
          
 
( SSPC ) White Blast Cleaning: A white metal blast cleaned surface, when viewed without magnification, shall be free of all visible oil, grease,
dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter.
 ...more...
 
 
      
 
( SSPC ) Near White Blast Cleaning: This joint standard covers the requirements for near-white blast cleaning of unpainted or painted steel surfaces by the use of abrasives. These requirements include the end condition of the surface and materials and procedures necessary to achieve and verify the end condition...more...
 
         
 
( SSPC ) Commercial Blast Cleaning: This joint standard covers the requirements for commercial blast cleaning of unpainted or painted steel surfaces by the use of abrasives. These requirements include the end condition of the surface and materials and
procedures necessary to achieve and verify the end condition....more...
 
          
 
( SSPC ) Power Tool Cleaning to Bare Cleaning: Metallic surfaces which are prepared according to this specification, when viewed without magnification, shall be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxide, corrosion products, and other foreign matter. Slight residues of rust and paint may be left in the lower portion of pits if the original surface is pitted..  ...more...
 
 
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