low-discharge
low-dispersion
low-distortion
low-divergence
low-doped
low-draft
low-drag
low-drift
low-ductile
low-ductility
  low-duty
low-duty-cycle
low-earing
low-early-strength
low-Earth
low-effort
low-emission
low-emittance
low-end
low-end-temperature
low-energy

    low-duty fireclay

    шамот низкой огнеупорности