BDN POLYXPAND™ fasteners are designed to create a much-required thermal expansion hole on plastic roofing materials and then securely fastened onto the purlin underneath in one-go. Owing to the wings on the drilling tip, a 10mm diameter thermal expansion hole is created during the process, which then snaps off immediately upon coming in contact with steel. A large BAZ washer completes the package, covering the expansion hole while providing superior strength against high winds.
Features and Benefits
True Australian AS3566 Standard
- Hex Washer Flanged Head: Separate EPDM steel bonded washer NOT required. (No risk of leakage)
- Thermoset 100% EPDM BAZ washer:
Weathering Resistant (UV / Ozone / Acid)
100% Leak proof sealing
Perfect fit under hex washer flange
Optional metal washer add-on
Shock absorbing (for high wind areas)
- Creates a 10mm dia. thermal expansion hole for plastics
- Winged Drilling Tip: Wings break off once in contact with the steel purlins, keeping the plastics sheets securely fastened.