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Swedish Standard SA 2.5 shot blasting / surface prep


(2002)

Q. I need to know the technical details about the following- Surface preparation - Mild steel part the surface needs to be prepared by sand blasting as per Swedish Standard , SA 2.5 minimum or better as per Swedish Standard. If it is possible then please inform about the surface finish value ( Ra, Rmax, e.g.) which can be achieved by the above mentioned process.

Please respond as early as possible.

Best Regards,

T.N.C. RANGANATHAM
SRIHARIKOTA, A.P., INDIA


A. Hi, T.N.C.. This is a Swedish Institute for Standards designation for "near white" blasted finish -- approximately equivalent to NACE No. 2/SSPC-SP10 [link by ed. to spec at TechStreet], and ISO 8501-1 [link by ed. to spec at TechStreet] WA.2.5

I believe it's actually "Sa.2.5", but I don't know if "Sa" is an abbreviation or acronym in Swedish. It is a visual standard, rather than something you measure with a profilometer.

Please see letter 12526 for a more complete explanation. Good luck.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



Readers: To minimize searching & thrashing, and offer multiple viewpoints, we combined multiple threads into the dialog you are viewing. Please forgive any resultant repetition.



Roughness as per Sa 2 1/2

(2004)

Q. For the preparation of CS surface I need to know the grit profile from blasting as per Sa 2-1/2 (roughness). Thank you in advance for your prompt answer.

Omar Kherici
Oil and gas project - Almaty, Kazakhstan


A. Hi Omar. Although there are standards for roughness, Sa 2-1/2 is not a roughness standard, it's a cleanliness standard. There is no specific roughness associated with it.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



Surface preparation without any surface preparation standard

(2004)

Q. What is the standard surface finish values (e.g Ra, Rmax) or units used to measure the surface finish of structural steel products.

What is the importance of surface preparation per SA 2.5. Where can I get hold of this spec - SA 2.5

What are the technical details of this spec Swedish Standard, SA 2.5. What will be the acceptance criterion for shot blasting -- prime or reject.

If product are shotblasted without reference to any surface finish spec, e.g SA 2.5, there will be any conflict/disagreement between the manufacture/purchaser?

felix Motswaledi MOGOAI
Plate manufacturing (rolling & heat treatment) - VANDERBILJPARK, GAUTENG, South Africa


Profilometer

A. Hi Felix.
Sa 2.5 is a cleanliness standard, not a surface roughness standard. An example of a surface roughness standard would be ISO 8503.

One reason cleanliness is required is because paint will not adhere properly to a dirty surface.

If you offer any service without reference to a spec, just expecting agreement with your customer about "implied industry methods" there is a significant chance of conflict after the job is completed; it's a bad idea :-(

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



Method for sandblasting to SSPC Sa 2.5

(2006)

Q. We are repairing our existing navigational buoys. we want to know about sandblasting method conforming to SSPC Sa 2.5 standard. please help us. thanks!

Genesis G [last name deleted for privacy by Editor]
construction business - Subic, Philippines


(2006)

A. Sa 2.5 equals SSPC 10. Sa is Swedish standard which is often used in marine work.
Regards,

Jim Wood
- Concord, California


(2006)

A. SA2.5, also known as near-white blast cleaning is a method of preparing steel surfaces which, when viewed without magnification, shall be free of all visible oil, grease, dirt, dust, mill scale, rust and paint / coatings. Generally evenly dispersed very light shadows, streaks and discolourations caused by stains of rust, mill scale or previously applied paint / coatings may remain on no more than 5% of the surface

Marilyn Rushworth
- Halifax, England



Readers: To minimize searching & thrashing, and offer multiple viewpoints, we combined multiple threads into the dialog you are viewing. Please forgive any resultant repetition.



September 3, 2009

Q. What is Sa 2 1/2 regarding surface preparation. and Sa stand for what?

dushyant upadhyay
- varansi, u.p., India


September 3, 2009

A. Hi, Dushyant. This is a Swedish Institute for Standards designation for "near white" blasted finish -- approximately equivalent to NACE No. 2/SSPC-SP10 [link by ed. to spec at TechStreet] 2, and ISO 8501-1 [link by ed. to spec at TechStreet] WA.2.5

I believe it's actually "Sa.2.5", but I don't know is "Sa" is an abbreviation or acronym in Swedish.

Please see letter 12526 for a more complete explanation.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



December 14, 2016 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Hello,

My question is kind of a general one. I was wondering if shot blasting process is applied for more surface area creation for the primer to adsorb or it's done only for cleaning the rust on metal pieces? For example I have got a metal piece and I'm asked to shotblast it to SA 2.5 norm. What will happen if I apply primer and paint within 310-450 micrometers thickness but shotblast isn't SA 2.5? Will the paint peel within time? Will shotblasting in SA 2.5 give my paint a longer life for it to stick onto the metal?

Thanks for sharing your time and I appreciate all help!

Ali Kanir
- Turkey, Istanbul


December 19, 2016

A. Specifications are basically acceptable guidelines. Meaning that if you do not conform to the specifications you will probably not achieve the surface finish or life span that the process is designed to produce. You will still get a surface that will accept a secondary process; however, the over all results will fail the time element.

tony kenton
AF Kenton
Nova Finishing Systems Inc.
Hatboro, Pennsylvania


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