the chorizo kid wrote:but with sausage that is not to be eaten fresh, and that also hangs and ages, like their spanish chorizo, the amount of salt is very important. it is a preservative, not just a flavoring agent. you can skimp on fresh, constantly refrigerated and soon to be cooked-and-eaten sausage all you want, but for the others, follow the recipe.
You are absolutely correct,
fresh sausage can have as little or non as the case may be. The norm in the trade is anywhere between 25 - 28g per kg. That being said I used 10g per Kg. There are enough sites out there \UK as well as USA] advocating the use of a lower salt intake.
As for what you mention about sausage that hangs and ages the minimum is from the unscientific test that I have done is 20g per kg. We arrived at this while a friend [a person whom I worked for for two years] had problems producing European wieners, as most know to make these one has to make an emulsion at the start. He had taken the salt content down to 16g per Kg [he was on a health kick, low salt and low fat, both of which did not work] After getting him back on track and explaining the reasons for the bad taste, the separation of the meat as well as the bad colour I dialled in the magic number of 20g per Kg
As said the test are not scientific, but talking to some of the large producers I was right with the number and was told not to go less.