The Glass Turntable Plate is an OEM part for Frigidaire microwaves. As the surface food rests upon during cooking, it features heat-resistant tempered glass construction suitable for high-power microwave usage.  Causes of damage can include cracking or splitting from thermal shock of sudden temperature changes during repeated heating and cooling cycles. Improper cleaning methods using harsh chemicals may also degrade protective coatings. Symptoms of a faulty glass plate involve:  Cracks or chips exposing sharp edges presenting a hazard Denting or warping preventing level rotation inside the cavity Staining or clouding compromising visibility of cooking foods This OEM Frigidaire replacement part is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore microwave models.5304513473 (AP6301660) replaces 5304463319.