E = 30 days of constant exposure cause no damage. Plastic may even tolerate for years.

G = Little or no damage after 30 days of constant exposure to the reagent.

F = Some effect after 7 days of constant exposure. Depending on the plastic, the effect may be crazing, cracking, loss of strength or discoloration. Solvents may cause softening, swelling and/or permeation losses.