In my search for polyurethane boards to make a plug, I am looking for low density. Approximately 4 to 6 Lbs. Cubic Ft (64 to 96 KG/Cu Meter) I have found a few off-shore suppliers including one each in UK, and Canada. I have made inquiries on pricing vie email or web response forms but I am not getting responses from the USA supplier after I was referred to them by the manufacturer. I would prefer finding a USA supplier to avoid the high cost of shipping and any possible duties or import restrictions. Can anyone please point me to a responsive supplier in the USA for this material?
For reference and perhaps to answer one key question, I do all of my research via the internet at night because I work during the day, so phone conversations is not an option for me.


A Lifelong Learner

I have used a polyisocyanurate product called Trymer available up to 6lb/cu.ft.  I bought it from Poly Cel (http://www.polycelinc.com/materials.html) in MA, USA.  About twice the price of EPS foam of a similar density.  It is easy to sand/machine and it is compatible with polyester resin. 

For a visual, this shows the 2lb version used as a substrate for tooling paste: https://explorecomposites.com/example-projects/building-plugs-with-tooling-paste/