Refractory Materials

Refractory Brick

Service Temp Up to 4,000°F

Chemistry Clay · Alumina · Silica · Basic

Std Shapes Straights · Arches · Wedges · Keys

Special Shapes Custom to drawing

Standards ASTM C27 and related specs

What we supply

Structural integrity, chemical resistance, decades of service.

Refractory brick delivers structural integrity, chemical resistance, and long service life in the most demanding industrial furnaces, kilns, and boilers operating today. Selection starts with chemistry — and chemistry is driven by the process. Red Stick Industrial Supply sources all major brick classifications from producers who meet ASTM specifications.

Fireclay Brick

Standard and super-duty for industrial furnaces, boilers, and incinerators. Service 2,600–2,900°F. Cost-effective, widely available, compatible with fireclay mortar systems.

High-Alumina Brick

50%–99% alumina for progressively higher service temperatures and resistance to acidic slags, chemical attack, and reducing atmospheres. The backbone of modern kiln and furnace construction.

Silica Brick

95%+ SiO₂ for coke ovens, glass tank crowns, and soaking pits. Excellent load-bearing strength at temperature. Must be heated slowly through the inversion temperature range.

Magnesia & MgCr Brick

Basic chemistry for basic slag — EAF roofs, BOF, copper smelters, and cement kilns. Withstands temperatures to 4,000°F and resists lime, iron oxide, and steel slag.

Insulating Firebrick (IFB)

K-20 through K-30 for backup insulation and lower-temp hot-face. Lightweight, easily cut and shaped on-site, essential for multi-layer furnace wall design.

Silicon Carbide & Specialty

SiC for abrasion resistance and thermal conductivity. Zirconia for glass tanks and special chemical environments. Carbon and graphite for aluminum and non-ferrous smelting.

All standard shapes in stock — special shapes sourced to your drawing

ASTM standard shapes — the 9" straight, arch, side arch, wedge, and key — cover the majority of furnace construction. Red Stick Industrial Supply stocks standard shapes in the most common grades. Special shapes are available from producers on a quote basis. Provide a drawing and we'll source them.

Product specifications

Brick Type	Alumina %	Max Temp	Key Property	Typical Application
Standard Fireclay	30–35%	2,600°F	General purpose	Fireplaces, boilers, general furnaces
Super-Duty Fireclay	38–44%	2,900°F	Improved refractoriness	Industrial furnaces, incinerators
High-Alumina 50%	50%	2,900°F	Acid resistance	Reheat furnaces, kilns
High-Alumina 70%	70%	3,100°F	High refractoriness	Petrochemical, specialty kilns
High-Alumina 90%	90%	3,300°F	Extreme duty	High-temp kilns, reducing atmospheres
Silica Brick	<1%	3,000°F	Load-bearing at temperature	Coke ovens, glass tank crowns
Magnesia Brick	—	4,000°F	Basic slag resistance	EAF roofs, BOF, cement kilns
IFB K-26	40%	2,600°F	Insulating	Backup insulation, low-temp hot face
Silicon Carbide	—	3,000°F	Abrasion / conductivity	Kiln furniture, sidewalls, skid rails

Brick quality and grading

Not all refractory brick is equal. Chemistry, fired density, cold crushing strength, apparent porosity, and pyrometric cone equivalent (PCE) are all meaningful quality indicators.