high-acceleration
high-activity
high-alkali
high-alloy
high-altitude
high-alumina
high-and-low
high-angle
high-antiknock
high-apogee
  high-ash
high-attenuation
high-back
high-bake
high-bandgap
high-bandwidth
high-bar
high-baud-rate
high-bit-rate
high-boiling
high-bypass