What are the main materials of ceramic tableware?

Please verify the following points and require itemized written supplier responses:（ceramic tableware materials） Ceramic tableware commonly includes porcelain, bone china, new bone china, stoneware and earthenware. Porcelain is dense and bright; bone china contains bone ash and is known for translucency and lightness; new bone china usually contains no natural bone ash; stoneware is thick and durable; earthenware relies heavily on glaze. Ask suppliers for material, firing method, water absorption, microwave and dishwasher suitability, samples and specification sheets. 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.