UL 569:2013 pdf download

6.7 Cadmium plating shall be not less than 0.0003 inch (0.o08 mm) thick, and zinc plating shall be notless than 0.0005 inch (0.013 mm) thick. However, on parts where threads constitute the major portion ofthe area, the cadmium or zinc plating shall be not less than 0.00015 inch (0.0038 mm) thick.

7 Materials for Flexible Hose Connectors

7.1 The hose used in the construction of a flexible hose connector shall be provided with a reinforcedsynthetic-rubber inner tube or liner of the oil-resistant type. A rubber cover is not required if the outer braidis impregnated with a rubber cement or compound. A tube or a cover shall be smooth，of uniformthickness,free from pitting,blisters,or other imperfections. Intentional pricking of a cover shall not beconsidered an imperfection.This requirement does not exclude the use of a corrugated cover.

7.2 Aluminum shall not be used in combination with copper or a copper alloy.

7.3 A part made of drawn-brass or machined from brass rod, containing more than 15 percent zinc shallwithstand,without cracking，the Moist Ammonia-Air Stress Cracking Test,Section 23.

7.4 End-connecting fittings shall be of corrosion resistant metal or of steel provided with a protectivecoating having corrosion-resistant qualities at least equivalent to those of the coatings specified in 7.5.7.5 Cadmium plating shall be not less than 0.0003 inch (0.008 mm) thick, and zinc plating shall be notless than 0.o005 inch (0.013 mm) thick.However, on parts where threads constitute the major portion ofthe area, the cadmium or zinc plating shall be not less than 0.00015 inch(0.0038 mm) thick.

8 End Connecting Fittings

8.1 Each end of a connector shall be provided with a connecting fitting consistent with the service forwhich the connector is designed.

8.2 A standard LP-Gas cylinder valve connecting fitting shall comply with the Standard forCompressed-Gas Cylinder Valve Outlet and Inlet Connections,ANSICGA v-1-1987.