Technical Data - Cooper Industries

1 MaterialsCarbon SteelChannels made from high-quality carbonsteel are continuously roll formed toprecise dimensions. By cold working thesteel mechanical properties are increased,allowing lightweight structures to carry therequired load. Corrosion resistance ofcarbon steel varies widely with coating andalloy. See Finishes for more SteelStainless steel channel is available in AISIType 304 or 316 material. Both arenon-magnetic and belong to the austeniticstainless steels group, based on alloycontent and crystallographic structure. Likecarbon steel, stainless steel exhibitsincreased strength when cold worked conditions make the use ofstainless steel ideal.

2 These includereducing long term maintenance costs,high ambient temperatures, appearance,and stable structural properties such asyield strength, and high creep 304 resists most organic chemicals,dyestuffs and a wide variety of inorganicchemicals at elevated or cryogenictemperatures. Type 316 contains slightlymore nickel and adds molybdenum to giveit better corrosion resistance in chlorideand sulfuric acid environments. For moreinformation concerning the differencesbetween types 304 and 316, aluminum channel is extrudedfrom aluminum alloy 6063-T6. Strut fittingsare made from aluminum alloy high strength to weight ratio ofchannel made of aluminum helps greatlyreduce the overall cost of installationthrough ease of handling and field owes its excellent corrosionresistance to its ability to form analuminum oxide film that immediatelyreforms when scratched or cut.

3 In mostoutdoor applications, aluminum hasexcellent resistance to weathering .The resistance to chemicals, indoor oroutdoor, can best be determined by testsconducted by the user with exposure tothe specific conditions for which it isintended. The corrosion resistance ofaluminum to some commonly knownchemicals is shown in the CorrosionChart on page 10. For further information,contact us or the Aluminum offer two fire retardant (FR) resins forstrut systems, polyester and vinyl resins are ideal for corrosiveenvironments or nonconductiveapplications with moderate strengthrequirements.

4 Some common types ofenvironments where Vinyl Ester Resins arerecommended, that Poly Esters are not,are paper mills, most any metal platingoperation and any condition withconcentrated levels of Chlorine, [ Cl- ].Please consult our fiberglass corrosionresistance charts on page 184 for specificchemical recommendation data . Unlike other base materials depicted inthis catalog, fiberglass exhibits uniquephysical property changes when operatingin elevated temperature conditions that area fraction of increase compared to steel oraluminum. Thus, it is advised against usingfiberglass in temperatures greater than200 refer to the "Corrosion ResistanceGuide" on page 184 for fiberglass strut systems aremanufactured from glass fiber-reinforcedplastic shapes that meet ASTM E-84, Class1 Flame Rating and self-extinguishingrequirements of ASTM D-635.

5 A surfaceveil is applied during pultrusion to insure aresin-rich surface and ultraviolet polyester is sufficient for most uses,vinyl ester is suitable for a broader range B22 SS6 87401A6 Eaton s B-Line Series Steel Strut is stamped with:Traceable to the steel s originMaterial/FinishPart number designationCompany Name Technical DataTechnical DataStrut Systems5 FinishesZinc CoatingsZinc protects steel in two ways. First itprotects the steel as a coating, andsecond as a sacrificial anode to repairbare areas such as cut edges, scratches,and gouges. The corrosion protection ofzinc is directly related to its thickness andthe environment.

6 This means a .2 milcoating will last twice as long as a .1 milcoating in the same also protects cut and drilled ZincElectrogalvanized Zinc (also known as zincplated or electroplated) is the process bywhich a coating of zinc is deposited onthe steel by electrolysis from a bath ofzinc rating of SC3, our standard, provides aminimum zinc coating thickness of .5 mils(excluding hardware, which is SC1 = .2mils).When exposed to air and moisture, zincforms a tough, adherent, protective filmconsisting of a mixture of zinc oxides,hydroxides, and carbonates. This film isin itself a barrier coating which slowssubsequent corrosive attack on the coating is usually recommended forindoor use in relatively dry areas, as itprovides ninety-six hours protection insalt spray testing per ASTM / Zinc Chromium / Zinc is a corrosion resistantcomposition, which was developed toprotect fasteners and small bulk items forautomotive use.

7 The coating applicationshave since been extended to larger partsand other markets. Chromium/Zinc composition is anaqueous coating dispersion containingchromium, proprietary organics, and zincflake. This finish provides 500 hours protectionin salt spray testing per ASTM Zinc(Mill galvanized, hot dip mill galvanizedor continuous hot dip galvanized) Pre-galvanized steel is produced by coatingcoils of sheet steel with zinc bycontinuously rolling the material throughmolten zinc at the mills. This is alsoknown as mill galvanized or hot dip millgalvanized. These coils are then slit tosize and fabricated by roll forming, shear-ing, punching, or forming to produce ourpre-galvanized strut G90 specification calls for a coatingof.

8 90 ounces of zinc per square foot ofsteel. This results in a coating of .45ounces per square foot on each side ofthe sheet. This is important whencomparing this finish to hot dip galvanized after fabrication, cut edges and weldedareas are not normally zinc coated;however, the zinc near the uncoatedmetal becomes a sacrificial anode toprotect the bare areas after a short periodof Dip Galvanized AfterFabrication (Hot dip galvanized orbatch hot dip galvanized)Hot dip galvanized strut products arefabricated from steel and then completelyimmersed in a bath of molten zinc.

9 Ametallic bond occurs resulting in a zinccoating that completely coats all surfaces,including edges and advantage of this method iscoating thickness. Strut products that arehot dip galvanized after fabrication have aminimum thickness of ounces persquare foot on each side, or a total per square foot of steel,according to ASTM zinc thickness is controlled by theamount of time each part is immersed inthe molten zinc bath as well as the speedat which it is removed. The term "doubledipping" refers to parts too large to fit intothe galvanizing kettle and must be dippedone end at a time.

10 It does not refer toextra coating layer of zinc which bonds to steelprovides a dual protection againstcorrosion. It protects first as an overallbarrier coating. If this coating happensto be scratched or gouged, zinc'ssecondary defense is called upon toprotect the steel by galvanic Galvanized After Fabrication isrecommended for prolonged outdoorexposure and will usually protect steel for20 years or more in most atmosphericenvironments and in many industrialenvironments. For best results, a zincrich paint (available from Eaton s B-LineBusiness) should be applied to field zinc rich paint will provide immediateprotection for these areas and eliminatethe short time period for galvanic actionto heal the damaged Life of Zinc Coatings In Various Atmospheric EnvironmentsHot Dip GalvanizedPre-Galvanized= Zinc Coating (.)