Iimpawu zekhreyithi yeziqhamo kunye nemifuno:
1. Uqoqosho (olunokurisayikilishwa)
2. Ukhuseleko lokusingqongileyo (ukukhusela indalo esingqongileyo)
3. Ucoceko (iasidi, ialkali, ukungunda, ukufuma, inundu)
4. Ikhuselekile (akukho spikes, akukho radiation, ayinayo ityhefu kwaye ayinancasa)
5. Ukulungeleka (akukho mfuneko yokulungiswa kunye nokuphathwa lula).