Phosphate: Probably the oldest and most widely used pretreatments are micro-crystalline, heat-stable phosphate conversion coatings. Phosphating is an inexpensive method of bulk-treating carbon steel prior to applying any Xylan fastener class coating. Phosphate deposition weights should be from 350 to 500 mg/ft2. The phosphate must be microcrystalline and heat-stable (Good examples: Keykote #36 and #40 from MacDermid Inc.) Gritblasting is required for optimum results.
 

Xylan 4090/P-92 primer: Developed for use with the Xylan 1000 series (including 1014) to provide even better corrosion resistance as a thin film over phosphate, it should be used only with the Xylan 1000 series and only to improve corrosion Resistance (it has no effect on adhesion).

This primer is not intended for use with Xylan 1400, 1424, 1427 and 1514. Phosphate pretreatment, in combination with these Xylan coatings, will provide 500 to 1 ,000 hours in the ASTM B-117 Salt Fog Test and l5 cycles in the DlN5001B Kesternich Test (at 2.0 ltrs SO2) with less than 15% red rust.
 

Commercial flash zinc plating:
This is the second most widely used pretreatments. 0.2 - A.3 mil of plating is applied. etched with a modified zinc phosphate (with a 2- minute dwell ) to achieve the required deposition weight, then coated with any Xylan fastener-class coating. This combination provides one of the most cost-effective ways to achieve outstanding corrosion resistance with a thin film.

Zinc platings do not provide make-up lubrication. The Xylan coating does - and it also functions as an excellent sealer. sealer. This system survives 1,000 to 3,000 hours n the ASTM B-1 17 Salt Fog test & 30 to 50 cycles of the DIN 50018 Kesternich Test (at 2.0 ltrs. So2).

Xylan P-5211 primer:
A zinc-rich pretreatments commonly used instead of plating to avoid hydrogen embrittlement. P-5211 is generally used when more than 30 cycles of the DIN 50018 DIN 50018 Kesternich- Test (at 2.0 ltrs SO2) are required Gritblasting and phosphating will enhance the performance of this primer even further. P-5211 is designed for use with Xylan 1400, 1424 & 1427.
 

Xylan P-501 primer:
Designed for use when phosphate is not available, it is used with Xylan 1400, 1424 and 1427 to provide corrosion resistance similar to that of normal phosphate treatment.
 

Xylar 2:
A ceramic-metallic coating that resists oxidation at high temperatures and has long term resistance to salt fog. it can also be used as a stand-alone coating or as a sacrifice a primer for all of our Xylan fastener-class Coatings.

Xylar 2 performs best when tolerances permit >1 mil (>25µm) of film thickness. lt can be applied in multiple coats up to 2 mils (50µm). While it is not always practical to apply 2mils, Xylar 2 at this thickness has reached 10,000 hours in salt fog with minimal red rust. And Xylar 2 will withstand up to 1,100°F/600°C of continuous use.