Dave I pulled this off of a HPL manufactures web site, thought you might be interested.
Composition of Rexcel Laminates
Decorative surface papers are impregnated with melamine resins and then pressed over Kraft paper core sheets impregnated with Phenolic resin. These sheets are then bonded at pressures greater than 1000 pounds per square inch at temperatures approaching 300 degrees Fahrenheit. Finished sheets are trimmed, and the backs sanded to facilitate bonding.
Thanks! Sounds like they've gone to a "best of both worlds" use.