Selection of mechanical seals for hydrothermal reactors

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I plan to buy a small high-pressure hydrothermal reactor recently; the required pressure is 6 kg, so I intend to acquire a high-temperature and high-pressure mixing tank with a pressure resistance of 8 kg. When consulting suppliers, there are two opinions: 1. Using a 204 mechanical seal allows for a pressure resistance of 0.8 Mpa, so normal operation is not a problem ； 2. Such small containers, sealed with 204, will break down in just a few days. This supplier claims to have been manufacturing reaction vessels for 18 years. After checking relevant information, I learned that the parameters for 204 sealing are as follows: □ Pressure: 0 to 0.8 MPa □ Temperature: 0 to 180°C □ Rotational speed: ≤500 r/min □ Medium: acids, alkalis, oils, polymer suspensions. I’m a bit confused; I hope friends who know more can help me out!