Tire ash is a raw material used in tire construction. To save money on material costs, some companies use up to 12% tire ash in their tires. High Tire ash content is shown to reduce the longevity and reliability of tires.
Before the advent of electrodeposition coating, the only protective finishes for steel wheels were powder coat, epoxy wet paint, and galvanized. Due to their inability to bond with steel, powder coating and epoxy wet paint offered little resistance in the salt spray test..