@danmar123 I have looked at Richlite in a basic way.
It seemingly comes in at approx' 700Kg/m3
This as a weight is typical of other Phenolics produced from Paper, Cotton or Fibreglass. Compression will only seem to be enough to produce a Board that has a useful structural property.
These Types of Phenolic are usually with a damping factor not as accurate for Damping / Dissipation as is Densified Wood and the few other materials are also comparable.
The Link will offer further guidance.