Can anyone tell me where I can what is required to place a childs art stamp on the market. The stamp will be made out of a polymer, not rubber. What testing to we have to do on this polymer?
Thanks

This site might be a good place to start :

http://www.contractlaboratory.com/labclass/toys.cfm

Here you go

http://www.cpsc.gov/

click the business tab

Off the top of my head you'll probably have to check for things like:
hazardous materials of construction
sharp corners and edges
crush it to see if it will shatter or break (leaving a sharp edge or small piece) under a target child's weight
pull it apart to see if any small pieces that could be swallowed will come off
etc