The exterior mirror glass is the reflective insert that sits within the mirror housing, providing the driver with a rearward field of view required by road traffic legislation. Modern mirror glasses are substantially more complex than a flat backed mirror: they incorporate a heating element bonded to the rear face to clear condensation and ice, and many include an electrochromic dimming layer, blue-tinted anti-dazzle coating, or a blind spot indicator LED array integrated into the glass assembly itself. When the glass cracks following a stone impact or develops a delamination bubble along the heating element grid, only the glass insert needs replacing — the housing, adjustment motor, and folding mechanism can be retained. The OE reference is particularly important here because mirror glasses are curved to a specific radius of curvature calibrated for the wing mirror arm length and mounting angle on each vehicle. A glass with a slightly different radius produces a distorted field of view that can misjudge distances. ALKAR and Van Wezel are well-established names in exterior mirror glass coverage for the Volkswagen, Mercedes-Benz, Ford, and Renault ranges. BLIC and Prasco offer further aftermarket breadth. Note that some glasses are supplied with adhesive backing tape — confirm your housing type before ordering.
Mirror glass OE numbers encode the curvature radius, physical dimensions, heating element connector type, and any integrated LED or dimming features specific to your model and trim level. Use the VIN or the make-model-year selector to find your application. Drivers side and passenger side glasses are never interchangeable — the curvature radius is mirrored and they are catalogued as separate OE references. If your glass includes a blind spot indicator, confirm the replacement glass includes the same LED connector or the warning system will not function after fitting.
OEM mirror glasses are produced to the vehicle manufacturer's radius and coating specification — typically including a precision blue-tinted anti-dazzle treatment on the passenger side and a heating grid of defined wattage. Aftermarket glasses from ALKAR, BLIC, or Van Wezel replicate these parameters closely and are suitable for road legal use. The main variable is glass tint uniformity and heating element reliability: budget units sometimes show uneven tinting at the edges or heating grids that fail to clear a full frost within the legislated time at low temperatures.
In most cases the glass insert can be replaced independently of the housing, motor, and casing. The glass is attached to a plastic backing plate that clips or bonds into the housing. Provided the housing, adjustment motor, and folding mechanism are undamaged, a glass-only replacement is straightforward and significantly less expensive than a complete mirror assembly. Heated glasses require the heating connector on the backing plate to be plugged into the corresponding socket inside the housing, so confirm the connector style matches before purchasing.
The most common causes are stone impacts from the road surface, car park manoeuvre contact, or thermal shock from pouring hot water on a frosted glass that has not yet warmed. Failure manifests as a spider-crack radiating from the impact point, delamination of the heating element grid which produces a persistent foggy patch that does not clear, or the glass detaching partially from its backing plate and vibrating at motorway speeds. Some tinted glasses also develop a milky haze at the edges over time as the anti-dazzle coating deteriorates through UV exposure.
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