Case tumbler media

shootist22-250 said:
An old wives tale rises again.

In my time on CGN this has to be the umpteenth time it has surfaced.
Let's say it once again....repeat after me...............BRASSO DOES NOT AFFECT BRASS LIFE.

For non-believers, do a search.

Thank you
Click to expand...

I took the time to do a search:
http://www.hghouston.com/coppers/brass77.htm

Stress corrosion cracking (SCC)
Stress corrosion cracking or "season cracking" occurs only in the simultaneous presence of a sufficiently high tensile stress and a specific corrosive environment. For brasses the environment involved is usually one containing ammonia or closely related substances such as amines, but atmospheres containing between 0.05% and 0.5% of sulphur dioxide or nitrites by volume can also cause stress corrosion cracking.

http://en.wikipedia.org/wiki/Brasso
Ingredients
The label of Australian Brasso lists "Liquid Hydrocarbons 630g/L; Ammonia 5g/L", whereas the MSDS for Brasso in North America lists: isopropyl alcohol 3-5%, ammonia 5-10%, silica powder 15-20% and oxalic acid 0-3% as the ingredients.[2]

I repeat: Use Nufinish, it contains no ammonia.

Thank you. :D
 
Hoser-eh said:
I took the time to do a search:
http://www.hghouston.com/coppers/brass77.htm

Stress corrosion cracking (SCC)
Stress corrosion cracking or "season cracking" occurs only in the simultaneous presence of a sufficiently high tensile stress and a specific corrosive environment. For brasses the environment involved is usually one containing ammonia or closely related substances such as amines, but atmospheres containing between 0.05% and 0.5% of sulphur dioxide or nitrites by volume can also cause stress corrosion cracking.

http://en.wikipedia.org/wiki/Brasso
Ingredients
The label of Australian Brasso lists "Liquid Hydrocarbons 630g/L; Ammonia 5g/L", whereas the MSDS for Brasso in North America lists: isopropyl alcohol 3-5%, ammonia 5-10%, silica powder 15-20% and oxalic acid 0-3% as the ingredients.[2]

I repeat: Use Nufinish, it contains no ammonia.

Thank you. :D
Click to expand...


Yes Nufinish does work well.


Well darn.... does that mean if I stop using brasso I can get more than 40-50 reloads, which I currently get, on cases of 22-250 un-annealed brass?:dancingbanana:

Not to prolong this discussion, but what was omitted in your posting on stress corrosion cracking is parameters of ammonia exposure. Such items as temperature, pressure, and concentration of the atmosphere (containing ammonia) and the material being affected are important factors in determining how quickly stress corrosion cracking will take place.

I do not believe that just because ammonia is present stress corrosion cracking will occur. Other factors need to come into play to help the process.
An analogy to this would be hydrogen sulphide gas. In low (<5 ppm). It stinks if you choose to smell it. At 1000ppm it will kill you in less than 2 heart beats.

Anyway, cool discussion and we shall continue on our way and do as we will. :D

Cheers
 
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