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Materials are the foundation of a product. To produce high-performance, high-quality products, it is essential to select appropriate materials, manage them properly, and make good use of them, ensuring that the types and specifications of the materials used meet the requirements of customers, design drawings, and relevant standards. The key to material quality control in plate heat exchangers lies in ensuring the economic viability, authenticity, and traceability of major components such as plates, gaskets, compression plates, frames, intermediate partitions, clamping studs, flanges, and connections, as well as the welding materials. This ensures the quality and service life of the product, as well as its safety and reliability. The materials of the main components of plate heat exchangers should meet or exceed the requirements specified in the industry standard \"Plate Heat Exchangers NBT 47004-2009\". Quality control of materials should be applied throughout all stages, including procurement, inspection, management, production, and acceptance. Below, Prippler provides a detailed overview of the materials commonly used in plate heat exchangers: 1. Plates: The choice of material for the plates has a significant impact on the performance, operating conditions, corrosion resistance, and service life of the plate heat exchanger. Below are the common sheet materials and their applicable ranges: Stainless steel 304: Suitable for fluids with low chloride content, such as purified water, river water, edible oil, and mineral oil ； Stainless steel 316: Suitable for purified water, river water, edible oil, mineral oil ； Stainless steel SMO254: Suitable for fluids with high chloride content, such as dilute sulfuric acid, dilute salt solutions, polar-free water solutions, and seawater ； Nickel: Suitable for high temperatures and high concentrations of caustic soda ； Titanium plates: Suitable for seawater, brine, and saline environments. Hastelloy C276/D205/B2G: Suitable for oxidizing acids such as concentrated sulfuric acid, hydrochloric acid, phosphoric acid, and mixed acids. 2. Compression plates (middle partition, frame, end covers): Q235A, Q235B, Q345B. 3. Connectors: 10, 20; stainless steel 304, 316, 321; titanium. 4. Flanges: Q235A, Q235B, Q345B, 20; stainless steel 304, 316, 321; titanium. 5. Clamping studs: 35, 45, 40Cr. 6. Guide rods: Q235A, 45. 7. Support pillars: Q235A. 8. Gaskets: The material of the gaskets affects the operating temperature and the heat exchange medium of the heat exchanger. The following are the common gasket materials used in heat exchangers and the heat transfer media they are suitable for: Nitrile rubber NBR: suitable for water, seawater, mineral oil, vegetable oil, ethanol, ethylene glycol, and alkylbenzene-containing refrigerants ； Ethylene propylene diene monomer rubber EPDM: water, steam, acids, alkalis, NaOH ； Hydrogenated Nitrile HNBR: Suitable for high-temperature mineral oils, high-temperature water, and nitrile rubber ； Fluororubber FKM: steam, high-temperature oil, acids, alkalis. Considering the different components of the material and its specific mechanical properties, as well as the physical properties of the heat transfer medium and the operating conditions, selecting the appropriate and cost-effective material for plate heat exchangers ensures that the plates have good stamping properties. Moreover, in different heat transfer media, such materials exhibit high resistance to corrosion, including resistance to chlorine, acids, and alkalis.