Cordierite (Catalyst Substrates)
A magnesium iron aluminium silicate ceramic used as the honeycomb substrate in catalytic converters, offering excellent thermal shock resistance and low pressure drop.
Overview
Cordierite (Mg₂Al₄Si₅O₁₈) is the primary ceramic material used for catalytic converter and particulate filter substrates in automotive exhaust aftertreatment systems. Its ultra-low coefficient of thermal expansion (~1.5 × 10⁻⁶/°C) gives it outstanding resistance to the severe thermal cycling experienced in exhaust environments. Formed into a honeycomb monolith structure with up to 900 cells per square inch (cpsi), cordierite provides maximum surface area for precious metal catalyst washcoat deposition while maintaining minimal exhaust backpressure. It is used in three-way catalytic converters (TWC) for petrol engines, diesel oxidation catalysts (DOC), and diesel particulate filters (DPF).
Automotive Applications
Similar Materials
Cerium
Rare Earth Element
The most abundant rare earth element, used in automotive catalytic converters as an oxygen storage component, in glass polishing, and in aluminium alloy strengthening.
Ferrochrome
Ferroalloy
An essential ferroalloy composed of chromium and iron used primarily as an alloying agent in the production of stainless and heat-resistant steels.
Boron
Metalloid/Element
A hard metalloid element used in minute additions for press-hardenable boron steels, as a glass former, and as a constituent of NdFeB permanent magnets (boron in the Nd2Fe14B phase). Critical hardenability enabler for automotive hot-stamped structures.
Ferrosilicon
Ferroalloy
An alloy of iron and silicon used primarily as a deoxidizer and alloying element in the production of steel and cast iron.
Properties
Category
Type
Catalyst Substrate Ceramic
Available Colors
Available Forms
Key Properties
- Ultra-low thermal expansion
- Excellent thermal shock resistance
- Low pressure drop (honeycomb)
- High surface area
- Chemical resistance
- High porosity variants available
Technical Specifications
Density
2.51 g/cm³ (dense); 0.4–0.6 g/cm³ (honeycomb)
Temperature Resistance
Up to 1,400°C
Sustainability
Sustainability Rating
Cordierite substrates enable catalytic emission control, directly reducing harmful exhaust emissions. Spent catalysts are recycled to recover precious metal washcoat.