If you purchased decanned cats, you will have no clue what the yield will be until you ball mill and assay. Otherwise it's a crap shoot.
Some people decan because whoever they dealt with in the past trusted them, and was alright with the yield, etc. If that is the case, if they used to sell to someone else but no longer do, then ask to speak with that person so you can ask questions like "Did they deal with you honestly" or "who was buying your catalytic material" and "why are you not doing it anymore". Answers to questions like these can help you decide if you should be purchasing cats in your particular market.
I know where I live, competition is so tight that you are lucky to find any cats in any quantity. They are all being accumulated and sent out of state to be processed.
Sometimes the person selling the cats sells them decanned because they know you are not going to be able to judge how much PGMs there are, approx. They may be hoping that you overpay because of the work involved in decanning.
Ask the question "how long have you been scrapping cats" if they have for any length of time, they already know better than to decan. Then you ask the question "you know already you get less for decanned cats, why did you decan them?". I think you get the picture.
If he's new, he probably didn't have a clue.
I thought this would probably be a good thread to post this information, this is yield data on different types of cats, with the pictures and what type of vehicle they come from.
https://dl.dropbox.com/u/56505223/Re...Converters.pdf
Good luck
Scott
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