Some examples of non-electrolytes are sugar, ether, urea, methanol, chloroform and benzene. A non-electrolyte does not dissociate in an aqueous solution into positive and negative ions. Instead of ionizing in water, non-electrolytes dissolve as molecules.
Another property of these substances is that they do not conduct electricity. Non-electrolytes are usually polar covalent compounds.
The opposite of a non-electrolyte is an electrolyte. This type of substance does dissociate in water, forming positive and negative ions. There are two kinds of electrolytes, which are weak and strong. The difference between a weak and strong electrolyte is that a strong type ionizes completely in a solution while a weak type dissociates partially. While some examples of strong electrolytes are sodium chloride and copper sulfate, weak electrolytes include acetic and benzoic acids.