(a) No material more flammable or combustible than wood or approved plastic shall be used in any permitted combustible sign. No combustible sign shall be illuminated by other than the reflector method of electric lighting and all parts of reflectors shall be of noncombustible material.
(b) Approved combustible plastic is any plastic material more than 0.050 inch thick which, when tested for flammability in sheets 0.060 inch thick in accordance with ASTM D 635, does not burn at a rate exceeding two and one-half inches per minute.
(Ord. 76-36, passed 6-22-1976)