Different types of ceramic coated self tapping zip screws
01/04/2012

Self-tapping Ceramic Coated Zip Screws

What are ceramic coated zip screws? Everybody is used to seeing common self-tapping needlepoint screws, also known as zip screws, which are plated zinc. These screws are primarily manufactured for inside installations since zinc plating is not really rust resistant enough for outdoor use. Zinc plating is usually available in three colors – white zinc (the most popular), blue zinc (very attractive for screws that are exposed) and yellow zinc (very popular plating for cabinet installers).

Another familiar variation to zip screws are standard zinc plated with the heads of the screws painted to match the gutters or siding.

A much less well known option is the ceramic coated needlepoint screws. Other names used for ceramic coating is Ruspert and Dacromet coatings. These ceramic coated zip screws offer more resistance to rust. The entire screw is coated, including the shank, with a method which can safeguard them with a 500 hour or 1000 hour salt spray tested product. These same screws can be bought with the heads color painted as well. This offers additional protection as well as matching the color scheme of gutters and siding. They are not as rust resistant as, say, stainless steel self-piercing screws, but they do very well in applications that need a little more resistance to rust.

MATERIAL /FINISH: CERAMIC COATED CARBON STEEL (1000 HOUR SALT SPRAY TESTED)

The ceramic coating is a non-organic, tri-layered ceramic surface coating developed to attain the best possible performance in the numerous pollutive and atmospheric conditions that cause corrosion. The 1st layer: a metallic zinc layer, the 2nd layer: a high-grade anti-corrosion chemical conversion film, and the 3rd top layer: a baked ceramic top coating. The distinguishing feature of the silver ceramic coating is the tight joining of the baked ceramic top coating and the chemical conversion film thanks to the cross-linking effect. These layers are bonded together with the metallic zinc layer through chemical reac tions, and this unique method of combining layers results in a rigid and dense combination of the coating films. The coating does not attribute its anti-corrosion properties to merely a single material, but the synergy of these three layers, which combined have superb rust proof qualities.

Compatible with metal coated and painted surfaces, fasteners coated with silver ceramic are resistant to acid and alkaline attack, galvanic corrosion and hydrogen embrittlement.

These fasteners conform to corrosive gas test standard (Kesternich) DIN50018 and give a Salt Spray Fog test to exceed (JISZ2731) 1000 Hours. (ASTM B117)