Abrasive Blasting

Abrasive Blasting "Sandblasting"

Neumann Industrial Coatings have the capability to Abrasive Blast using either Steel Grit or Crushed Glass media at our Currumbin facility on the Gold Coast. Steel Grit is for use on any heavy Industrial plant and equipment, marine vessel & structure, truck bodies or trailers and can be completed up to Australian Standard class Sa3 (White Metal) or as required. Crushed Glass can be used on lighter steels, galvanized steel, stainless steel or aluminium.
Steel Grit Media
Crushed Glass Media

Abrasive Blasting is often referred to as Sandblasting. Sandblasting is a very general term used to describe the act of propelling very fine bits of material at high-velocity to clean or etch a surface. The term “Sandblasting” is still often mistakenly used to describe other, now more commonly used and better forms of Abrasive Blasting. Find out more about the term “Sandblasting”….

Steel Grit Media

Steel Grit blasting is the most widely used process for cleaning, stripping and removing rust from metal surfaces. The grade or size of the grit determine the ultimate finish. Steel grit is a cast steel angular grit produced by crushing specially heat-treated oversize shot pellets. Its behaviour in service depends on hardness – a characteristic readily modified by suitable heat treatment. We typically use a GL 40 Steel Grit (about 0.5mm), which is harder than the GP Steel Grit, and it is particularly suited to heavy descaling and surface preparation requirements. GL steel grit cleans rapidly to give a clean finish to all surfaces.

Our expert staff can determine the most appropriate method to suit your particular application and desired finish.

Crushed Glass Media

Crushed Glass Media is a 100% recycled material. The angular particles in crushed glass allow for aggressive surface profiling and removal of coatings such as epoxy, paint, alkyds, vinyl, polyurea, coal tar and elastomers. Crushed Glass Grit is much lighter weight than many slags, allowing for increased consumption efficiency and production time – up to 30-50% less glass grit used.

Australian Standards

Neumann Abrasive Blasting follows all applicable Australian Standards in all its abrasive blasting and associated activities.
  • AS1627.4-2005 – Metal finishing – Preparation and pretreatment of surfaces – Part 4: Abrasive blast cleaning of steel 
  • AS1627.9-2002 – Metal finishing – Preparation and pretreatment of surfaces – Part 9: Pictorial surface preparation standards for painting steel surfaces

All Neumann Contractors personnel are competent and suitable trained, qualified and supervised.

Our Abrasive Blasting is fully compliant with:

Rust Grades and Classes of Blast Cleaning

According to AS 1727.9 – Metal finishing – Preparation and pretreatment of surfaces – Pictorial surface preparation standards for painting steel surfaces, there are four initial rust grades, depending on the amount of mill scale and rust. The worst grade of rust that is evident on the steel surface is recorded and treated accordingly. The four Rust Grades are:

GRADE A
Steel surface covered completely with adherent mill scale and with little if any rust.

GRADE B
Steel surface, which has begun to rust and from which the mill scale has begun to flake.

GRADE C
Steel surface on which the mill scale has rusted away or from which it can be scraped, but with little pitting visible to the naked eye.

GRADE D
Steel surface on which the mill scale has rusted away and on which considerable pitting is visible to the naked eye.

Classes of Blast Cleaning

(Abrasive Blasting) – As defined in AS 1727.9 – Metal finishing – Preparation and pretreatment of surfaces – pictorial surface preparation standards for painting steel surfaces, there are also four classes of Blast Cleaning, which are:

Sa 1 (Brush Blast)
Light blast cleaning.  When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter.  The appearance corresponds to the prints designated Sa 1 in AS 1627.9.  NOTE: Mill scale, rust or paint coating is considered to be poorly adhering if it can be removed by lifting with a blunt putty knife.

Sa 2 (Commercial Blast)
Thorough blast cleaning. When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from most mill scale, rust, paint coatings and foreign matter.  Any residual contamination shall be firmly adhering (see note to Sa 1).  It corresponds to the appearance of the prints designated Sa 2 in AS 1627.9.

Sa 2½ (Near White Metal)
Very thorough blast cleaning.  When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from mill scale, rust, paint coatings and foreign matter.  Any remaining contamination shall show only as slight stains in the form of spots or stripes and correspond to the prints designated Sa 2½ in AS 1627.9.

Sa 3 (White Metal)
Blast cleaning to visually clean steel. When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and shall be free from mill scale, rust, paint coating and foreign matter.  It shall then have a uniform metallic colour and correspond to the prints designated Sa 3 in AS 1627.9.

Note: The images shown above are indicative only, they show the results of abrasive blasting to Grade C rusted steel surfaces.

Neumann Industrial Coatings predominately perform abrasive blasting services to a class Sa 2½ (Near White Metal) and Sa 3 (White Metal)

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