Caution:  If you are going to be citing the NIOSH Recommendations for Chemical Protective Clothing for glove guidance – check when it was published, it is severely dated.

Monona is right, look at the individual glove manufacturer for testing permeation and degradation information.  If you do a Google search, you’ll end up with generic information that will be unreliable – depending upon which glove has been specified. 

Suppliers and Google will provide generic “data” but nothing I would rely upon when you really need to confirm adequate protection. 

It’s late and I can’t remember the name of the organic chemist who started the testing work at Ansell.  He developed the first spreadsheet, which later turned into their database.  When I ran into a new molecule that was going to be tested for toxicity as an investigational new drug, if he could not refer to a very close analog to provide protection, I could send him a sample and he would test to provide a recommendation.  It depends upon what you are trying to protect against.  Is a generic, possibly diluted level of protection adequate or are you trying to protect from a true hazard?