API oval gaskets with Znic plated applied in valve fitting Size:inch 1/2- ... ) gasket shapeoctagonal, oval ,lens, serratedstandardsAPI 6A,HG20633-97,HG20612-97materialsoft iron,carbon steel,304,316,F5,F51,321,347.etc.temperatureAs ... (HB)max temperature(degrees)soft iron90450carbon steel120450F51150540304160600316160600 API Oval Gaskets With Zinc Plated