Fire-safe certification per API 6A requires seals to withstand 1,800°F for 30 minutes. Graphite stem packing and MTM seats maintain shutoff post-burn. The best designs use Inconel 718 body cladding and expanded graphite rings. Leakage is limited to 400 ml/min during fire test. Backseat engagement is verified post-exposure. This certification is mandatory for refinery and LNG plant gat... https://globalsealstech.com/