1. For those that have reached their replacement deadline, they should be replaced (or identified by an experienced person to determine if they can continue to be used). For those that have not yet reached their replacement deadline and are currently not in use, they should be sealed in a plastic bag, packed in a cardboard box, and labeled with the furnace number, quantity, reason for replacement, source, and date, and properly stored.

2. For partially damaged items (such as one out of three being broken) that have not yet reached their lifespan, they can be used temporarily or replaced. For new crucibles with only a few batches, the workshop supervisor will decide whether to use them. If they can be used and can be combined to form a complete set, they should be used. For those that can be used but are not currently needed, they should be sealed and stored. When reusing items that have been sealed for storage, it is recommended to use them on a purification furnace.

3. During each furnace disassembly, clean the heat field oxides and thoroughly remove silicon渗硅 from the graphite components. Thoroughly wipe the conduit and insulation cover to prevent contamination of the raw materials. When handling graphite components, prioritize personal safety and handle them with care to ensure their safety.

4. Strictly follow the operation procedures for heating, material dissolution, re-melting, and shutdown to protect the graphite components. After disassembling each furnace, carefully clean the graphite accessories, meticulously inspect the seed crystal and the condition of all graphite thermal field components, and keep detailed records.

5. Inspect graphite components for cracks, particularly the graphite crucible, graphite tray, and graphite crucible rod, for any signs of cracking. If cracks are found, report them to the workshop supervisor immediately and arrange for replacements. For areas with adhered silicon, make a judgment or report to the workshop supervisor. The on-duty foreman is responsible for inspecting and reviewing before the fifth furnace prior to the expected service life. After the fifth furnace prior to the expected service life, the workshop supervisor is responsible for the inspection and review.

6. Upon the expiration of the service life of graphite components, such as graphite trays, crucible rods, and graphite crucibles, which may cause significant losses if used past their due date, these components should be removed and replaced with new ones first. The removed graphite components should be sealed and stored. The single crystal workshop, technical department, and production department will review them before further action. Other components like heaters, insulation cylinders, and flow tubes should be carefully inspected for any microcracks or defects. These graphite components can generally continue to be used if they do not have the aforementioned defects. Detailed records should be kept for graphite thermal field components that lead to a sealed furnace.

7. Ensure detailed records are kept for graphite heat field components involved in accidents. For problematic graphite components, maintain detailed records and store them in a designated location to prevent confusion.