Hobson technical document
BDX X9 ProteXion Coating: Corrosivity Categories C1 to CX
A one-page Hobson technical note on the X9 ProteXion coating used on BDX self drilling screws for steel and timber. It states the corrosivity category the coating suits and lists the ISO 9223 and AS 4312 categories from C1 to CX.
What this covers
- X9 ProteXion coating
- Corrosivity categories C1 to CX
- Selection and approval
Applies to Roofing & Cladding Screws and Tek Screws (Self-Drilling Metal Screws).
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- X9 ProteXion coating is suitable for ISO 9223 category 4 (C4, high corrosivity) environments, as also described in AS 4312.
- Corrosivity categories: C1 very low (dry indoors), C2 low (arid or urban inland), C3 medium (coastal or light industrial), C4 high (calm seashore), C5 very high (surf seashore), CX extreme (shoreline with severe surf).
- For distances from the shoreline and other corrosive sources, the document points to AS 4312 Section 3.
- Choosing the right screw means considering the substrate, material thickness, environmental exposure and loads.
- Before X9 coated screws are installed, the technical data and application should be reviewed and approved by the project's qualified design professional.
Who it helps: Builders and designers choosing a screw coating for coastal or industrial sites.
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