Dyna Flex Inc Blog

Nonconductive vs conductive hose – What is the difference?

December 7th, 2009

For some applications it is very important to have nonconductive hose.  For example if you are working close to electric power lines, you don’t want current going through the hose and the fittings. We make a SAE100r7 nonconductive hose which is orange in color and has no carbon black.

Conversely sometimes you may want a hose to be conductive. All hose is conductive. Our orange is less conductive than black because there is no carbon black in it.  With paint spray hose, you want your assembly to be able to conduct a static charge from one fitting, through the hose, to the other fitting.

Paint spray hose has a conductive element in it which makes it conductive.  Here is what nobody tells you. There is little conductivity in the cover you see. Paint spray hose is a good example of conductive hose. 7100 series Airless Paint spray hose usually has a conductive braid or tube that goes through it to help increase it’s conductive.

The static drain is a polymeric material to which carbon black or other conductive filler has been added to achieve the desired level of conductivity. Generally, a hose assembly will be considered sufficiently conductive to dissipate static electric charges if its total resistance is less than 10 ⁸ ohms. While the length of the hose will vary from application to application, ordinary industrial uses usually do not require a hose longer than 30 meters and, therefore, a resistance less than 10 ⁶ ohms per linear 30 centimeters is an acceptable value for most applications.

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Entry Filed under: hose