If a steel-lined equipment is lined with two layers of rubber, what is the material of each layer? The same or different?

Is there any relevant material available? The medium is salt acid

The raw materials for our company’s PTFE, PVDF, PFA, MF, ECTFE, and FEP products are manufactured by renowned foreign fluoroplastic companies, while the sheets are produced by well-known foreign industrial plastic manufacturers as well as Swiss engineering plastic companies. • Type: Corrosion-resistant storage tank • Material: Steel tank with plastic lining • Brand: Huahao • Model: As per drawings • Capacity: 50 (m3) • Weight: 1000 (kg) • Suitable for: Corrosive liquids • Specification: 1000–2000 (m) • Height: 2 • Customization available: Yes. The specific features of tanks with fluorine lining (corrosion-resistant lining) are as follows: 1. Resistant to strong acids and strong bases; pH range of 1–14. 2. It can resist the penetration of small molecular gases, including oxygen, carbon dioxide, chlorine, and oxychlorine gases. 3. High purity; the precipitation rate is extremely low, meeting the purity requirements of the photovoltaic industry. 4. Excellent electrical properties. 5. Wide operating temperature range, from ultra-low temperatures to 150°C. 6. Good weather resistance. 7. Flame retardant (oxygen index greater than 52%), and less prone to burning than traditional fluoroplastics. 8. The surface is extremely smooth; it has the smoothest surface of all fluoroplastics, with a very low coefficient of friction. 9. Strong mechanical properties: it is harder and more robust than traditional fluoroplastics, with improved wear resistance.