bulk modulus at 23C:
from dilatometry = 3.4 GPa
from ultrasound = 3.2 GPa
density at 23C:
by weight and dimensions = 0.76 g/cc
48vol% filler based on filler density = 0.32 g/cc
KIC from pre-cracked 3-pt bend samples at 23C = 1.12 ± 0.09 MPa-m1/2
stress at failure from stainless steel napkin ring at 23C
= 49.3 ± 4.9 MPa