3. The equilibrium methods referred to in paragraph 1(a) are those defined in the following standards:—
(a)International Standards ISO 1516 and ISO 3680 (which show whether or not a liquid is classified on the basis of flash point as extremely flammable, highly flammable or flammable);
(b)International Standards ISO 1523 and ISO 3679 (which provide a value for a flash point).