Ceramic softening temperature indicates when the material begins to lose dimensional rigidity under defined conditions, while maximum working temperature includes practical margins for load, time, cycling and service environment. Always design from the application-rated temperature rather than the softening number alone.

A ceramic component can meet its individual drawing and still fail because mating-part tolerances, misalignment, debris, over-tightening or thermal expansion create assembly stress. Review tolerance stack-up and functional fit, not only isolated part dimensions.

Custom ceramic acceptance criteria should distinguish cosmetic variation from structural defects. Defect type, location, depth and functional consequence matter more than appearance alone, especially around seals, load paths, holes and thin sections.

Custom ceramic parts can meet length, diameter and thickness tolerance while still failing fit or sealing because of warpage, nonparallel surfaces or poor straightness. Specify geometric tolerances only where they control real function.

Visual inspection is the first crack-detection method for industrial ceramics, while penetrant, microscopy, acoustic methods, ultrasonic inspection or CT may be useful for specific dense or high-value parts. Highly porous ceramics require particular caution because many surface inspection methods produce misleading results.