The coefficient of thermal expansion is critical for thermally cycled and constrained process ceramics. Evaluate CTE together with component size, temperature range, metal interfaces and installation clearance instead of relying only on maximum operating temperature.

A ceramic component intended for containment must be evaluated for connected porosity and actual leakage, not only density or material composition. Porous ceramics are useful for filtration and catalyst applications but should not be assumed suitable for gas-tight process boundaries.

High porosity does not guarantee high permeability. Fluid flow through porous ceramic also depends on pore size, throat size, connectivity, tortuosity, thickness and fouling. Use actual hydraulic data when pressure drop matters.

Open porosity is accessible to gas or liquid and influences water absorption, permeability and chemical penetration. Closed porosity remains isolated inside the ceramic. Two ceramics with similar total porosity can therefore behave very differently in service.

A complete custom process ceramic RFQ should include drawing, material or service conditions, operating temperature, chemistry, critical tolerances, load, mating components, quantity, inspection requirements and failure history where relevant. This reduces both quotation uncertainty and production risk.