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Xylan coating preventsleaks past threadsPressure vessels, valves, pipe unions, storagetanks, reactors, pipe lines, and other fluidcontainmentequipment are often fitted withthreaded plugs for inspection, pressure relief,filling, or tapping.Coatings on pipe plugs not only improvetheir performance and reliability but also makethem easier to use. A thin film of Xylan eliminatesthe PTFE tape normally wrapped aroundthe threads to seal them.hostile environment of heat, oil and friction.• Cosworth replaced steel throttle plates withaluminum, which is lighter, but running betweenaluminum guides soon caused scuffing. So theycoated the throttle plate and the guides withXylan, solving the scuffing problem and providingpermanent dry lubrication, even in the presenceof gasoline vapor.• Magnesium castings are lighter, but contactwith harder materials (such as the sinterediron rotor in Cosworth's oil scavenger pump)caused wear, rendering the castings unserviceable.A coating of Xylan 1010 completelysolved the problem. Even after extensive racingtrials, no appreciable wear was evident.Having proved itself on the race track, Xylanis now enabling production car designers to cutweight and wear as they improve performance— all at a lower cost.In addition, the corrosion protection and lowfrictionproperties of the coating greatly reducebreak-out torques, enabling users to remove theplugs at a later date without destroying them.In most instances, the pipe plugs may bereused without difficulty.Xylan coatings are also available in manycolors, enabling users to color-code particularplug sizes and different alloys.Xylan proves a winneron the trackReducing weight and minimizing wear aretwo major objectives of car designers aroundthe world — especially in car racing. But thereis a problem: the lighter the material, the greaterthe tendency to wear.Cosworth Engineering, internationally renowneddesigners of high-performance engines,has solved many design problems withXylan coatings on engine components:• Aluminum cylinder liners save weight, butthey suffer from scuffing. A collar of Xylansprayed around the base of the cylinder linereliminates the problem, even in the engine's16
4. Whitford primersXylan, when combined with a zinc-rich sacrificialprimer, can withstand 1,080 hours of exposure in thesalt-fog cabinet. Rust is minimal, the coating is stillfunctional and the fasteners are fully serviceable.Most Xylan coatings are formulated tofunction as single-coat materials. Thereare times, however, when a primer willprovide significantly improved performance, andtherefore more than justify any additional cost.Note: There is a difference between “primers”and “basecoats”, and the two should not beconfused. Whitford defines the terms as follows:• Primer: a coating designed to standalone and function by itself, but that canalso be used to enhance the performanceof a different topcoat.• Basecoat: a coating designed to be partof a specific system, without which thesystem will not perform as specified. Basecoatsgenerally will not function properlyalone.Primers can be organic or inorganic, metallicor non-metallic. The selection of which primer ismost suitable for an application depends largelyon the desired performance enhancement, theenvironment in which the coating system willoperate, and to a lesser degree on the topcoatto be used.The mechanisms of corrosion control arequite complex. However, as a general principle,Xylan primers improve corrosion resistance byone of three methods. The first is inhibition. Theuse of select pigments inhibits the corrosionreaction and promotes the formation of a stable,passive oxide layer on the metal surface.The second is sacrificial protection. Primershighly filled with anodic metallic pigments corrodemore readily than the base metal. The byproductsof this sacrificial corrosion then fill poreswithin the coating, further reducing the corrosionprocess. The third is the use of inert fillers,which can increase the length of the diffusionpath of the necessary components of corrosion.By providing a barrier to oxygen and moisture,the corrosion reaction is greatly reduced.Regardless of the primer selection or theenvironment to which the coating system isexposed, a primer will only offer enhanced performanceif applied to a properly prepared surface.This is so important to developing the fullpotential of high-performance coatings that thenext chapter is dedicated to proper surfacepreparation and application conditions.Left: Coated bolt but with no primer in ASTM B117 after 500 hours. Right: Same conditions but with a primer.What a difference the use of the right primer can make!17
Page 2 and 3: The purpose of this publicationEver
Page 4 and 5: 1. The surprising success of high-p
Page 6 and 7: are filled with other lubricants (n
Page 8 and 9: LoadincreasesRelationship ofLoad to
Page 10 and 11: stand is approximately 50,000 (PV).
Page 12 and 13: Eliminating ice buildupWhen air flo
Page 14 and 15: is more uniform than that for other
Page 16 and 17: 3. Solving problems with Xylan coat
Page 20 and 21: 5. Applying XylanApplying coatings
Page 22 and 23: ation for steel which is generally
Page 24 and 25: flashing process, in which the carr
Page 26 and 27: Guide to application and processing
Page 28 and 29: tional methods, although the fastes
Page 30 and 31: Service life is extended by at leas
Page 32 and 33: 9. Protecting the environmentThe so
Page 34 and 35: 10. Whitford’s wide range of othe
Page 36 and 37: Xylac coatings are high-temperature
Page 38 and 39: QuikWood ® epoxy patches wood easi
Page 40 and 41: Index and glossaryThese definitions
Page 42 and 43: Whitford keeps Kesternich cabinets
Page 44: How to contact WhitfordWhitford man

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