Vinyl is impervious to corrosion when placed in contact with steel or aluminum frames, when coated in veneer plaster or wet joint compounds, and resists impacts, dents, and damage during construction. Vinyl has low electrical and thermal conductivity and is considered an excellent insulator, as well as being self-extinguishing and offering better resistance to burning than many other common building materials. No priming is required to add paint to vinyl products due to its paint adhesion properties. Additionally, vinyl has a lower cost than equivalent products manufactured from zinc or aluminum, for use when the highest levels of corrosion resistance are required.
#40 is pictured, there are 5 types of Wide Flange Corner Bead for different applications dictated by the size required by the corner condition.