What is the test for impartiality in arbitration?

An arbitration is in the nature of a judicial determination and arbitrators are to act impartially. In Szilard v. Szasz, 1954 CanLII 4 (SCC), [1955] S.C.R. 3 Rand J. stated: From its inception arbitration has been held to be of the nature of judicial determination and to entail incidents appropriate to that fact. The arbitrators are to exercise their function not as the advocates of the parties nominating them, and a fortiori of one party when they are agreed upon by all, but with as free, independent and impartial minds as the circumstances permit. In particular they must be untrammelled by such influences as to a fair minded person would raise a reasonable doubt of that impersonal attitude which each party is entitled to.