Our group has been looking to make soap from waste glycerin to sell to our University campus. We are new to making this stuff and wanted to glean some insight from the experts.
So besides the SAP test (which seems very similar to the titration method in the biodiesel process to determine the amount of catalyst you use), what kind of quality tests are needed to determine whether your soap is safe to use or not? We want to distribute this product to local dorm rooms and want to be sure that our product is safe for our customers, so are there any simple tests to determine whether it's safe or not? Is it even necessary to investigate this?
Also, after browsing the internet I found this. Would this be useful if we are trying to sell the soap to someone: ASTM Soap Tests
Or would it be a waste of money?
Thanks for the help!
Haven't read The Guide huh?
ASTM testing is great if your batch is 1000gal or so because the results will only be valid for the batch being tested. All follow up batches will not be covered by the test as the parameters may change.
The SAP value for biodiesel glycerine is stable within a percentage point or two and as such does not require continual rechecking for each batch. It is only when you add additional acids whose SAP is not known that testing is required.
I have a great app on my soap site that can help you determine SAP for any unknown acid. Once that SAP value is determined then all you have to do is add it to the pre-established SAP for the biodiesel glycerine and process it.
** Biodiesel Glycerine Soap - The Guide
- on 5 continents helping people make & sell soap from the Biodiesel Glycerine.
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