# Molecular weights from https://www.nist.gov/pml/atomic-weights-and-isotopic-compositions-relative-atomic-masses.
# Density source: https://en.wikipedia.org/wiki/Polyethylene#High-density_(HDPE)
# Material composition source: same as density

# Material name:
# high density polyethylene (HDPE) - C2H4

# Number of elements:
2

# Density:
0.941000

# Atomic number(s) and corresponding mass fraction(s):
1    0.143724    # hydrogen
6    0.856276    # carbon
