Unpainted Castings Better for You and the Environment Exceptional Quality , Environmentally Friendly , Non - Toxic
REASONS WHY NEENAH PROMOTES UNPAINTED CASTINGS:
CAST IRON IS CORROSION RESISTANT Cast iron forms an iron - oxide silicate scale that is difficult to penetrate and minimizes and often eliminates further corrosion . There are Neenah Foundry Manhole covers that are over 100 years old that are still in service ! PAINT HIDES DEFECTS Blow holes , shrink , and other defects that can compromise a casting ’ s integrity and strength may be filled and painted to disguise them . Neenah Foundry is committed to quality , and we have nothing to hide , our unpainted castings show the customer exactly what they are getting ! REGULATORY AND STANDARD COMPLIANCE AASHTO M306 Section 5 . 3 . 4 recommends against painting . Federal Aviation Administration Advisory Circular ( FAA AC ) 150 / 5320 - 5D Section 7 - 6 . 1 . 5 states grates shall be unpainted , so any defects remain apparent . 47 out of 50 States utilize unpainted gray and ductile iron castings . CONCRETE ADHERES BETTER TO UNPAINTED CAST IRON Due to the relatively porous nature of cast iron , concrete adheres well to cast iron , adding paint provides a barrier and can cause delamination of the concrete form the cast iron . PAINT IS TEMPORARY AND ADDS TO COST Paint wears off quickly from gray iron infrastructure castings . Sand , dirt , debris and traffic wear off paint quickly . Depending on vehicle or foot traffic , paint may begin to wear off a casting in as little as a few weeks . NO PAINT IS BETTER FOR THE ENVIRONMENT Paint may release harmful chemicals into the air or water . During the painting process , VOCs may be released into the atmosphere . Paint that wears off may enter surface waters and contribute to pollution and contamination . The materials in unpainted cast iron are naturally occurring elements and contain no hazardous substances .
Phone : ( 800 ) 558 - 5075
Email : solutions @ neenahfoundry . com
www . neenahfoundry . com
Figure 2 Casting after partial exposure to wetting
Figure 1 New casting prior to exposure to moisture
Figure 3 Full Surface oxidation after complete wetting
Figure 5 Dark iron-oxide silicate scale and subscale minimizes and often eliminates further corrosion (approximately 6 months)
Figure 4 Black oxide begins forming. Approximately 1 to 2 months
Phone : ( 800 ) 558 - 5075
Email : solutions @ neenahfoundry . com
www . neenahfoundry . com
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