--- title: What does bonderized mean in the T-Top 4 in. Bonderized Steel Exhaust Vent Pipe Flashing? description: Bonderized is an additional coating, with an anticorrosive phosphate solution applied over galvanized steel. --- [Skip to content](https://help.gibraltarbuildingproducts.com/en/knowledge/what-does-bonderized-mean-in-the-t-top-4-in.-bonderized-steel-exhaust-vent-pipe-flashing#main-content) English Show submenu for translations ![GBAD Full Color.png](https://blog.stealthbond.com/hubfs/GBAD%20Full%20Color.png) Open main navigation Close main navigation - English Show submenu for translations - Go to www.gibraltarbuildingproducts.com Go to www.gibraltarbuildingproducts.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://help.gibraltarbuildingproducts.com/en/knowledge?hsLang=en) 2. [Ventilation](https://help.gibraltarbuildingproducts.com/en/knowledge/ventilation?hsLang=en) 3. [Roof Louvers](https://help.gibraltarbuildingproducts.com/en/knowledge/ventilation?hsLang=en#roof-louvers) # What does bonderized mean in the T-Top 4 in. Bonderized Steel Exhaust Vent Pipe Flashing? ## Bonderized is an additional coating, with an anticorrosive phosphate solution applied over galvanized steel. Bonderized is an additional coating, with an anticorrosive phosphate solution applied over galvanized steel. 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