Mech-Galv Coated Self-drilling Screw, in accordance to RoHS Standard to the European Union,No Hazardous Substances
involve in the coating such as Lead (Pb), Cadmium(Cd), Mercury (Hg) & Hexavalent Chromium (Cr6+). Product qualify for “GREEN
Building” application.
Mechanical galvanized screws coating is produced according to Australia Standard for self-drilling screw corrosion
resistant requirement AS-3566.2-2002 with metallurgical profile micro-density grade 8 requirements,to ensure excellent coating
adhesion. Firstly, the screws are coated by using a 360 degree rotation plating process to mechanically weld zinc & tin ally powder
to the surface. This process helps zinc plating coat evenly on to screw threads which helps to form the first layer of protection from
corrosion. Screws are than soaked in liquid Ruspert and heated for solidification which form a second layer coating that could
generates lubrication during drilling application and help reduce friction that could destruction the inner protection layer of zinc plating.
Process under room temperature eliminates the re-tempering or softening.NON-Exposion to acid during production
prevents screw from hydrogen embrittlement.