Currently, the common thickness in China ranges from 0.5 to 500mm, with the standard size being 1000*2000mm. Domestic machines can produce widths up to 2000mm and lengths of up to 30,000mm, predominantly using No. 1 electrolytic lead, with some also made from recycled lead. These have slightly lower quality and slightly different pricing. Lead plates are durable, offering excellent corrosion, high-temperature, and fire resistance, and have a longer lifespan than other materials; they are stable in nature, allowing for reuse after installation without affecting their main performance characteristics. Lead plates have a silver-like luster, do not require surface treatments like coloring, and do not fade, maintaining a clear, shiny appearance over time; they are easy to clean, resist dirt, and are simple and convenient to maintain. How to distinguish the quality of radiation shielding lead plates: - Remove the door viewer, doorbell box, or lock handle to inspect the internal structure of the door. The protective door should have several reinforcing rebars to organically connect the front and rear panels. - The protective door should contain materials like asbestos with fireproofing, thermal insulation, and soundproofing properties as fillers. The seller should provide a "Testing Qualification Certificate" from the relevant authorities, verifying compliance with the mandatory standard GB17565-1998 technical requirements. - Feel the weight of the protective door. - Inspect the product's craftsmanship, looking for welding defects and the tightness of the door leaf fit with the door frame. The above is related to lead plates and is intended to be helpful.