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ApprovalsA wide range of approvals assuresthe suitability in contact with gasand drinking water. The testsinclude water purity and bacterialattack. Furthermore the coatingmeets the requirements specifiedfor use in waste water and gas pipesystems. The coating also meets therequirements of Kest SFW 2.0. TheRESICOAT ® R4 epoxy resin carriesover 80 drinking water approvals.Some of these include: Belgaqua(Belgium), DGS (France), KWT(Germany), KIWA (the Netherlands),NSF Standard 61 (USA), WRAS(United Kingdom) as well asdrinking water approvals in Austria,Switzerland and the Czech Republic.And last but not least the RESICOAT ®R4 meets the requirements of DIN30677, 30677 T1 + T2, DIN 3476 andpasses the GSK standard.Coating application processBefore the fittings are coated, theyare cleaned, and then grid-blastedaccording to class SA 2 ½. Bothapplication techniques, FluidisedBed Coating or Electrostatic SprayApplication, are used to apply thecoating to our fittings.Fluidized bed coatingThe powder melts onto thepre-heated grid-blasted fitting andexcessive powder falls off, helped bymovement of the coated part.Electrostatic spray applicationThe powder is applied by anelectrostatic spray gun, eithermanually or by a robot.Anti Friction coatingGalling or fretting is a severe form ofadhesive wear, which occurs duringsliding contact of one surface relativeto another. Clumps of one part maystick to the mating part and breakaway from the surface. This is alsothe case with stainless steel. Toprevent this problem, anti frictioncoatings can be used. Blue colouredcoating indicates that the bolts arestainless steel A2 and black colouredcoating indicates that the bolts arestainless steel A4.Teflon coating (PTFE)In order to prevent friction, thestainless steel bolts are spray-coatedwith fluorocarbon coating, a lowfriction coating applied to threads.This anti friction coating is a drylubricant consisting of suspensionsof the solid lubricant PTFE. Thiscoating has the property of reducingthe torque-tension scatter duringtightening. This type of coating is alsoused to prevent problems caused byweld splatter obstructing the threadsof weld nuts during their placementand it eliminates the need formasking or cleaning when painted,since paint will not adhere to thecoating. The Teflon coating can besupplied in a wide variety of differentcolours.Passivated nutsAnother anti friction measure is theuse of passivated nuts. Here, anotherzinc layer lubricates the threadreducing friction.Anti-Seize CompoundsAnti-seize compounds are usedon the threads of fasteners. Itprevents galling of mating surfaceson especially the stainless steelfasteners. Furthermore it can providea barrier to water penetration sincethe threads are sealed by use of thecompound. On the steel fasteners ittherefore also improves the corrosionresistance to allow the parts tobe subsequently disassembledeven under adverse environmentalconditions. We advise to use alubricant containing molybdenumdisulphide or copper, such asMolykote Cu-7439 plus copper pastor equivalent. This solid lubricantacts as a high pressure resistantfilm. It can be used by itself as a drylubricant as well as in other solidlubricants and in oils and greases.Molykote copper pasteGSK logo188