Why do ceramic tableware crack, chip or fade?

Please verify the following points and require itemized written supplier responses:（ceramic tableware cracks chips fading） Cracks may result from thermal shock, impact, improper stacking, body defects or firing stress; chipping usually comes from edge impact; fading may indicate weak overglaze durability. Inspect rims, bases, handles and decal edges and stop using items with through-cracks. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.