Mack Puts Impact-Resistant Glass on New Granite
Mack is making its ImpactShield windshield standard on the new Granite, bringing Corning Fusion5 Glass into a Class 8 vocational truck for fleets chasing uptime.
A windshield aimed at uptime
Mack Trucks is bringing a tougher windshield to the vocational market, making Mack ImpactShield standard on the all-new Mack Granite. The company says the one-piece bonded curved windshield is the first Class 8 truck application of Corning Fusion5 Glass, a material adapted from automotive exterior glass work.
The pitch is straightforward for dump, construction, and other vocational fleets: fewer windshield failures, fewer unplanned service events, and lower replacement costs over the life of the truck. Mack says the design is meant to improve impact resistance, chip resistance, crack resistance, and sand pitting resistance compared with standard Class 8 glass.
Granite timing and model availability
The all-new Granite was shown at ConExpo-Con/Agg 2026 with a galvanized steel cab, 270-degree radar coverage, an Electronic Park Brake with rollaway protection, and a redesigned interior shaped with driver input. ImpactShield will be standard on the Granite when the truck opens for orders in the second half of 2026.
Production is expected to begin in January 2027 at Mack's Lehigh Valley Operations plant in Macungie, Pennsylvania. Mack also plans to offer the windshield as an upgrade option on Mack Aero windshields for the Pioneer, Anthem, and Keystone models.
Why fleets will care
Windshield damage is a small line item until it pulls a truck out of service. For fleets running in jobsites, quarries, and rough vocational routes, a more durable windshield is not a luxury feature. It is a maintenance and uptime lever, especially when glass replacement means downtime, driver disruption, and another repair event to schedule.
