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topic 12526p2

Sand blasting standards: Swedish SA 1, SA 2, SA 2.5, SA 3 vs. NACE and Ra

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A discussion started in 2002 but continuing through 2019

December 31, 2011 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Is it possible to achieve surface roughness 6.3 Ra from initial surface roughness 12.5 Ra by grit blasting with SA1 or SA1-1/2? Material forged steel.

Abdullah Ansari
wind energy - Pune, Maharashtra, India

January 19, 2012

A. Are you sure you are talking Ra? I don't think you can achieve those results using any blasting media.

tony kenton
AF Kenton
Hatboro, Pennsylvania

February 1, 2012

Q. For example: machined surface roughness Ra 12, can we blast it to SA 2.1/2 and achieve surface roughness 6.3 Ra?

Abdullah Ansari [returning]
wind energy - Pune, Maharashtra, India

February 2, 2012

A. Hi, Abdulah. I think AF (Tony) told you "no". To the best of my knowledge, blasting is for cleaning (removing surface contaminants), and I have personally never heard of anyone attempting to polish an article by blasting, so I think he's right.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

P.S. Jan. 2015: Upon re-examination, Abdullah is talking about 6.3 microns not 6.3 microinches; this is not "polishing" and probably is achievable by blasting in some fashion; but I do not have the necessary experience to answer the question of whether or not it is practical to simultaneously blast forged steel to Ra 6.3 microns and Sa 2.5.

January 25, 2012

Q. What is the size and specification of SA2.5 iron grit?

Ashok Kumar
- India

February 17, 2012

A. Dear Mr. Ashok Kumar, Sa 2.5 is a surface cleanliness level. So how can know grit size?
Sohail Hashmi

- karachi, Pakistan

April 13, 2012

Q. 1.What is the max.percentage of humidity to conduct sand blasting of steel structures?

2.How to measure the profiles SA2,SA2.5 & SA3 at site?

Please help me by answering these questions

B V Ganeswara Rao
- Vishakhapatnam,AP,INDIA

May 8, 2012

Q. Dear Sir,
What is the specification grade for normal surface cleaning by hand before painting?

Subramanyan V A
- Calicut,Kerala, India

July 10, 2012

Q. How can we convert Sa 2.5 to millimeters?

- thrissur, kerala, india

July 10, 2012

Patron: "Waiter, my strawberries & cream have mud in them! Did you wash them?"

Waiter: "No problem sir, we can re-slice the berries smaller if the chunks are too large for your taste".

A. Hi cousin Sunilantonyt --

Please start at the top of this page and read it slowly and patiently to understand that Sa 2.5 is a visual standard for cleanliness, like the patron is talking about. It is not a measurement of surface profile like the waiter is talking about -- and no conversion between the two is possible. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

August 21, 2012

Q. Could you tell the difference between rust grades A and B blasted to Sa3?

Almer G.
- philippines

October 16, 2012

Q. What is the meaning of "Degrease" according to SSPC SP1, and Profile 75, Profile 75µm

Javeed Akhlaque
- Pakistan

August 11, 2013

Q. I want clear Visual Photo or Reference of Sa 1 to Sa 3 value after Shot Blasting on HR Sheet (thickness 8-10 mm).

- Jamshedpur, Jharkhand

July 2013

A. Hi Arijit. Please carefully read the page. I already answered that question on October 21, 2012: "HMG Paints Ltd. offers a free 24-page PDF with pictures of these surfaces at:". Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

August 25, 2013

Q. Sir,
What surface profile is for Sa 2.5 sand blasting?

- AbuDhabi, UAE

August 2013

A. Hi Boby. Perhaps we continue to misunderstand each other's words and phrases, but many people have tried to make it clear that Sa 2.5 is a visual standard for cleanliness and it has nothing to do with surface profiles, which are measures of roughness not cleanliness.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

September 12, 2013

Q. As per customer, requirement is sa2.5 -- but we did sa3. Is there any problem?

thiruppathi manikandan
oil field services - hidd, manama,bahrain

September 2013

A. Hi Thiruppathi. I'm not an expert in this subject, but I can't imagine how it could be a problem. It sounds to me like you've simply removed any doubt that the surface is clean enough to comply with Sa2.5. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

October 15, 2013


Manufacturer of LPG Cylinders - DELHI INDIA

October 16, 2013

A. Hi Shriram. This is available for Rs 130 from Jain Book Agency at

Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

February 24, 2014

affil. link
Advances in Abrasive Technology
from Abe Books

affil. link
Abrasive Blasting Operations from Abe Books

Q. Dear sirs,

What is the full form of Sa In Swedish Blasting standard?
My answer was degree of cleanliness in an interview. But interviewer was not satisfied with my answer. The interviewer was From United States in SADARA project at Jubail in Saudi Arabia. So please send answer as soon as you can.

birendra Kumar Kathbaniya
- Dammam, Saudi Arabia

February 2014

A. Hi Birendra. Some have said Sa stands for "standard abrasive", others say it stands for "sand", and others claim the "S" stands for Swedish; I say you can't translate abbreviations between languages in the first place :-)

But perhaps the interviewer's problem with your answer is that "degree of cleanliness" may not have quite conveyed the nature of ISO-8501-1 and the ratings like Sa 1, Sa 2, Sa 2.5 and Sa 3 that are associated with it. I think the main point, which is made several times in this thread, is that it is a standard which includes 24 photographs and is a guide for "Visual assessment of surface cleanliness". Please download the short free booklet from HMG Paints that was previously mentioned and I think you will understand it thoroughly. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

May 13, 2014

A. SA:Sweden Airblast
ST:Sweden Tool

Derek Satre
- Medicine Hat, Alberta, Canada

July 29, 2014

Q. Dear sir,

I want to know about the Swedish standard SA-2.5, i.e., to check surface roughness in microns.

With regards


Rohan jena
- Odisha,india

July 2014

A. Hi cousin Rohan. Please study this thread and you will learn that your question isn't quite properly formed -- because SA-2.5 has nothing to do with microns or surface roughness. Good luck.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha


October 8, 2014

thumbs up signHi Ted,

I said 'Arrrgh' so many times when reading this page. You are a very patient man, and generous with your knowledge. If I could apologise for the blatant ignorance, I would.

Thank you


Matthais DeSOUZA
- Mumbai, Maharashtra, India

October 2014

Thanks Matt. I have the world's best job: I receive & post people's questions & answers from my own home on my own schedule; I can interject my personal opinions at my leisure, and I'm free to google around whenever I find anything interesting -- and get paid for it all through advertising revenue. Yes, I sometimes have to deal with repetition -- but that's a very small price to pay for not having to deal with the much harder stuff that most workers face :-)

I do wish I could save the faster learners from the boredom of repeated answers, but since I haven't figured out how to do that yet, all I can do is try my best to make the site a fun & pleasant place to visit. Thanks again!


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

January 10, 2015

Q. Dear Sir,

I read the entire communication on this page since from the beginning ...

It is clearly mentioned that "Surface roughness" cannot be the outcome of blasting process and it isn't measurable also - NO standard calls...

But I observed one table for standards of surface preparation for steel in which ISO 8503-1 [affil. link to spec at Techstreet] calls for surface roughness characteristics of blast-cleaned surface..

Anyone can assist me in getting more details in the same?

Adik Chavan
- Pune, India

January 2015

thumbs up signHi cousin Adik. Thanks for your patience in reading the whole thing.

Unfortunately I do not have all of the standards that people mention on this site, but ISO 8503-1 [affil. link to spec at Techstreet], which you are talking about, is not the ISO 8501 that other people were talking about. ISO 8501-1 is the "visual standards for cleanliness", and this cannot be equated to surface roughness because it is a visual standard for cleanliness and not a roughness standard. We gave an analogous example that strawberries can be clean or dirty irrespective of the size of the slices.

ISO 8503 appears to be "surface roughness" standards, not visual cleanliness standards.

I don't believe that anyone said that surface roughness "cannot be the outcome of a blasting process and it isn't measurable". The whole point of ISO 8503-1 seems to be that it can be the outcome of blasting and it is measurable. Anthony Kenton and myself did express the opinion that it was probably not practical to achieve an Ra 6.3 polish by blasting, but I think I may have been too hasty :-(
I, and probably Mr. Kenton, was thinking in microinches instead of microns, but upon re-examination microns was probably intended and Ra 6.3 microns is probably doable by blasting -- which is not to say that Abdullah Ansari will necessarily be able to achieve what he wants; I don't know :-)


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

February 25, 2015

Q. I want to know if it is necessary to measure temperature & humidity of surface which is to be sand blasted.

Yogesh Bhujbal
- Satara, Maharashtra, India

February 2015

thumbs up sign Hi Yogesh. I hope some reader fully understands the context of your question because it is too abstract for me. If you are a local weld shop offering to clean up a customer's old lawn mower, the answer is no. If a specification you are processing to requires it, the answer is of course yes. If you are an aerospace shop involved in processing airliner components, the answer is possibly yes.


Ted Mooney, Teds signature
Ted Mooney, P.E. - Pine Beach, New Jersey
Striving to live Aloha

March 3, 2015

A. To add to Ted's answer. We also need to know what materials you are working with. You should also be aware that oxidation is always a problem which is caused by temperature and humidity.

tony kenton
AF Kenton
Hatboro, Pennsylvania

May 30, 2018

Q. What is the blasting type for the interior of an existing petroleum storage tank that's been unused for some period. Note. It has been blasted and primed before use. Now a little pore of corrosion exists. Thanks

Lot aura international limited - ETHIOOE west, Delta state, Nigeria

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