Letter 12526

Swedish standard SA 2.5, SA 3 for sand blasting for cast iron part 

I need to know the technical details about the following- Surface preparation - Cast Iron part ( gratings, used for cooking ranges); the surface needs to be prepared by sand blasting as per Swedish Standard , SA 2.5 minimum or better as per Swedish Standard , SA 3. If it is possible then please inform about the surface finish value ( Ra, Rmax eg.) which can be achieved by the above mentioned process.

lease respond as early as possible.

Best Regards,

Souren Pal
ABM STEELS Pvt. Ltd. - Ahmedabad, Gujarat, India

Dear Mr. Souren Pal,

I am also interested in the relationship between the SA standards SA 1, 2 21/2 and 3 and Ra. An interesting answer on your question which may be of help to me?

Best Regards,

Laure Spriensma
Elzinga b.v. - Jirnsum, The Netherlands

I WOULD LIKE TO INQUIRE INFORMATION REGARDING SAND BLASTING PROCEDURES, EQUIPMENTS AND MATERIAL, AS DESCRIBED IN SWEDISH STANDARD SA1,2,2.5,3? YOUR COOPERATION ON THIS MATTER WILL BE HGHLY APPRECIATED.

FADI MUSALLAM
- ABU DHABI, UAE

Mr. Souren Paul , Laure Spriensma, Mr. FADI MUSALLAM,

Surface preparation standards are stipulated by various bodies throughout the world to designate the cleanliness condition of blasted steel, prior to applying a protective coating. The applicable cleanliness standard is usually called for by either the protective coating manufacturer or the owner of the structure to be painted. The most commonly referred to standards are SSPC, NACE, and Swedish Standards. Each standard is divided into four standards of cleanliness, broadly described as follows; brush off, commercial, near white metal, white metal. Whilst each standard may differ slightly in requirements and terminology the following cross reference chart indicates the close approximation of each level of cleanliness for each standard.

BRUSH OFF COMMERCIAL NEAR WHITE METAL WHITE METAL SSPC SP 7 SP 6 SP 10 SP 5 NACE No.4 No.3 No.2 No.1 SWEDISH Sa.1 Sa.2 Sa.2.5 Sa.3

A brief description of each of the four levels of cleanliness is as follows: Brush Off - Loose mill scale, loose rust and foreign particles are removed.

Commercial - Mill scale, rust and foreign particles are substantially removed and grey metal is visible.

Near White Metal - Mill scale, rust and foreign particles are removed to the extent that only traces remain in the form of spots or stripes. The cleaned surface will show varying shades of grey. White Metal - Visible mill scale, rust and foreign particles are entirely removed. The cleaned surface should have a uniform metallic colour but may show varying shades of grey when viewed at different angles.

I hope the above info is useful to you. We are setting up a shipyard and are installing a plate preparation shop.

Regards,

Bijit Sarkar
Shipbuilding - Calcutta, WB, India

Grit profile from blasting according to SA 2-1/2.

Omar Kherici
Bateman Kazakhstan - Almaty, Kazakhstan

Grit blasting. SA 2.5 .... what what is it ? and Y SA 2.5 Y not 4.5 or what ever looking forward for ur reply

Yasir Al-Mahrooqi
Royal Court Afairs - Oman, Muscat

May I know the surface profile difference between SA 2.5 and SA 3 in microns?

Shahaji Doltade
- UAE

Please give me the details of S.A. 2.5. Where can we purchase this standard?

Kuldeep Bhat
Employee - India

What is Sa 2.5 and Sa 2 1/2
Please explain elaborately for the above (with technical support)

Venu Gopalarao
student - Angul, Orissa, India

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