Highland Refractory manufactures the complete range of fire clay bricks (clay fire bricks) in grades N-1 through N-6, with Al₂O₃ content from 30% to 48% and refractoriness from 1580°C to 1750°C.
Standard dimensions 230×114×65 mm (T-3) are stocked for immediate dispatch; custom wedge, arch, skew, and keystone profiles are produced to customer drawings at ±1 mm tolerance. MOQ 3 tons, lead time 30–40 working days for standard grades, 40–60 working days for custom shapes.
Kiln firebrick is a shaped refractory brick engineered to line the hot faces, working linings, and transition zones of industrial kilns. Manufactured from calcined bauxite, fire clay, and high-purity alumina, pressed at 1500 tons and fired at 1400–1600°C, kiln firebricks deliver refractoriness up to 1790°C, cold crushing strength ≥30–70 MPa, and thermal shock resistance ≥15 cycles. Highland supplies 10+ kiln brick grades — including high alumina kiln bricks, silica kiln bricks, magnesia kiln bricks, fireclay kiln bricks, mullite insulation kiln bricks, and silicon carbide kiln bricks — covering cement rotary kilns, glass melting furnaces, ceramic tunnel kilns, blast furnaces, and incineration kilns.
Lightweight refractory bricks are porous refractory materials manufactured from carefully selected alumino-silicate raw materials combined with pore-forming technologies. Through controlled firing processes, these bricks achieve a low bulk density and high porosity, allowing them to provide excellent thermal insulation while remaining stable at elevated temperatures. Typical performance ranges include: Bulk Density: approximately 0.6 – 1.3 g/cm³ Maximum Service Temperature: typically 1200°C – 1600°C Thermal Conductivity: significantly lower than dense refractory bricks Cold Crushing Strength: sufficient for insulation and backup lining applications It is important to note that lightweight refractory bricks are not intended for heavy load-bearing zones.
Standard Size: 9 x 4.5 x 2.5 inches (Equivalent to 230 x 114 x 65 mm). Weight per Brick: Approximately 8.0 lbs (3.6 kg). Material Grades: Available in Low Duty (2000F), High Duty (2700F), and Super Duty (3000F+). Alumina Content: Ranging from 35 percent to 55 percent depending on your application. Dimensional Tolerance: +/- 1.5 percent (Industry-leading precision for tight masonry joints).
Fireclay Arch Bricks (35-45% Alumina): Ideal for residential pizza ovens, fireplaces, and low-temperature industrial zones. These offer excellent thermal shock resistance. High Alumina Arch Bricks (55-85% Alumina): Designed for the most punishing environments, such as cement kilns or steel ladles. These bricks resist slag penetration and maintain structural integrity up to 1700 degrees Celsius (3100 Fahrenheit). Mullite and Corundum Arch Bricks: For specialized glass or petrochemical applications where zero-contamination and extreme heat resistance are non-negotiable.
Kiln firebrick is a shaped refractory brick engineered to line the hot faces, working linings, and transition zones of industrial kilns. Manufactured from calcined bauxite, fire clay, and high-purity alumina, pressed at 1500 tons and fired at 1400–1600°C, kiln firebricks deliver refractoriness up to 1790°C, cold crushing strength ≥30–70 MPa, and thermal shock resistance ≥15 cycles. Highland supplies 10+ kiln brick grades — including high alumina kiln bricks, silica kiln bricks, magnesia kiln bricks, fireclay kiln bricks, mullite insulation kiln bricks, and silicon carbide kiln bricks — covering cement rotary kilns, glass melting furnaces, ceramic tunnel kilns, blast furnaces, and incineration kilns.
Lightweight refractory bricks are porous refractory materials manufactured from carefully selected alumino-silicate raw materials combined with pore-forming technologies. Through controlled firing processes, these bricks achieve a low bulk density and high porosity, allowing them to provide excellent thermal insulation while remaining stable at elevated temperatures. Typical performance ranges include: Bulk Density: approximately 0.6 – 1.3 g/cm³ Maximum Service Temperature: typically 1200°C – 1600°C Thermal Conductivity: significantly lower than dense refractory bricks Cold Crushing Strength: sufficient for insulation and backup lining applications It is important to note that lightweight refractory bricks are not intended for heavy load-bearing zones.
Standard Size: 9 x 4.5 x 2.5 inches (Equivalent to 230 x 114 x 65 mm). Weight per Brick: Approximately 8.0 lbs (3.6 kg). Material Grades: Available in Low Duty (2000F), High Duty (2700F), and Super Duty (3000F+). Alumina Content: Ranging from 35 percent to 55 percent depending on your application. Dimensional Tolerance: +/- 1.5 percent (Industry-leading precision for tight masonry joints).
Fireclay Arch Bricks (35-45% Alumina): Ideal for residential pizza ovens, fireplaces, and low-temperature industrial zones. These offer excellent thermal shock resistance. High Alumina Arch Bricks (55-85% Alumina): Designed for the most punishing environments, such as cement kilns or steel ladles. These bricks resist slag penetration and maintain structural integrity up to 1700 degrees Celsius (3100 Fahrenheit). Mullite and Corundum Arch Bricks: For specialized glass or petrochemical applications where zero-contamination and extreme heat resistance are non-negotiable.
Highland Refractory manufactures the complete range of fire clay bricks (clay fire bricks) in grades N-1 through N-6, with Al₂O₃ content from 30% to 48% and refractoriness from 1580°C to 1750°C. Standard dimensions 230×114×65 mm (T-3) are stocked for immediate dispatch; custom wedge, arch, skew, and keystone profiles are produced to customer drawings at ±1 mm tolerance. MOQ 3 tons, lead time 30–40 working days for standard grades, 40–60 working days for custom shapes.
Grades
N-1 ~ N-6
Al₂O₃ Content
30% – 48%
Refractoriness
1580°C – 1750°C
Standard Size
230×114×65 mm
MOQ
3 tons
Lead Time
30–40 days
The table below lists all six standard fire clay brick grades with their key parameters and current stock availability. For detailed technical properties (RUL, CCS, apparent porosity, permanent linear change), please refer to our fireclay refractory brick technical guide.
| Grade | Al₂O₃ ≥ | Refractoriness ≥ | Primary Use | Stock |
|---|---|---|---|---|
| N-1 | 42% | 1750°C | Blast furnace hot blast stove, coke oven | In stock |
| N-2a | 40% | 1730°C | Blast furnace backup lining, coke oven wall | In stock |
| N-2b | 38% | 1730°C | Tunnel kiln car deck, rotary kiln safety course | In stock |
| N-3a | 35% | 1710°C | General kiln lining, regenerator | In stock |
| N-3b | 33% | 1710°C | Boiler combustion chamber, flue | Made to order |
| N-4 | 32% | 1690°C | Ladle backup, lower-temperature zones | Made to order |
| N-5 | 30% | 1670°C | Insulating backup, non-critical zones | Made to order |
| N-6 | 30% | 1580°C | Low-temperature furnaces, pipe insulation | Made to order |
Founded in 1990, Highland Refractory operates a complete fire clay brick production line from raw material processing through finished product inspection at our Xinmi, Henan facility. The plant covers 80,000 m² with 110 skilled workers and an annual output of 50,000+ tons across all refractory product lines.
| Parameter | Specification |
|---|---|
| Annual Capacity (fire clay brick) | 15,000+ tons |
| Production Lines | 3 dedicated clay brick lines |
| Pressing Equipment | 400-ton – 1000-ton friction presses |
| Kiln Type | Tunnel kiln (148 m, gas-fired) |
| Firing Temperature | 1300–1350°C |
| Firing Cycle | 72 hours (cold → peak → cool) |
| Standard Lead Time | 30–40 working days (stocked grades) |
| Custom Shape Lead Time | 40–60 working days (from drawing approval) |
| MOQ | 3 tons (standard); 5 tons (custom shapes) |
Beyond the standard T-3 straight brick (230×114×65 mm), Highland produces the full range of fire brick shapes required for furnace construction. Custom profiles are manufactured from customer drawings or site templates — send your drawings and we will provide a quotation within 12 hours.
| Shape Type | Typical Application | Standard or Custom |
|---|---|---|
| Straight (T-3, T-6, T-19) | Walls, general lining | Standard — stocked |
| Wedge (side wedge, end wedge) | Kiln arch, furnace crown | Standard — stocked |
| Arch (radial arch, skewback) | Dome construction, curved roofs | Custom — from drawing |
| Skew / Key | Arch transition, corner support | Custom — from drawing |
| Keystone | Arch center lock | Custom — from drawing |
| Tongue & Groove | Interlocking wall construction | Custom — from drawing |
| Special-shaped | Burner blocks, peep holes, custom inserts | Custom — from drawing |
Dimensional tolerance for all custom shapes: ±1 mm on pressing faces, ±2 mm on non-pressing faces. All custom shapes undergo individual mold preparation and sample pressing before batch production.
Every batch of fire clay bricks undergoes a full quality inspection before dispatch. Highland's quality system is certified under:
Quality management system certified for the complete production process — from raw material inspection to finished product dispatch.
Each production batch receives X-ray fluorescence chemical analysis verifying Al₂O₃, SiO₂, Fe₂O₃, and alkali content against specification.
Every shipment includes physical property test certificates covering refractoriness, CCS, apparent porosity, and permanent linear change.
Additional certifications and test reports are available on request: CE conformity, SGS third-party inspection, and customer-specific qualification protocols.
No trading margin. You work directly with the factory — from raw material (local Xinmi clay) through pressing, firing, and inspection. Price is factory-direct and stable.
Fire clay brick, high alumina brick, insulating brick, refractory castable, and mortar — all from one supplier. Simplified procurement, consistent quality, combined shipping.
Standard T-3 bricks in N-1 through N-3a grades are stocked for dispatch within 5 working days. Custom shapes typically ship in 40–60 days — faster than industry average.
Yes. We provide free samples of standard grades (N-1 through N-3a) in sizes up to 230×114×65 mm. The customer covers shipping costs only. For custom-shape samples, a mold fee may apply — this is credited toward the production order. Contact us with your grade and size requirements to request samples.
The following are stocked for dispatch within 5 working days:
• T-3 straight: 230×114×65 mm (grades N-1, N-2a, N-2b, N-3a)
• T-6 straight: 250×123×65 mm (grades N-2a, N-3a)
• Side wedge: 230×114×65/55 mm (grade N-2a)
• End wedge: 230×114×65/55 mm (grade N-2a)
All other sizes and grades are made to order. Contact us for current stock status.
Standard export packaging: bricks are stacked on wooden pallets (fumigated, ISPM-15 compliant), separated by corrugated cardboard, wrapped in stretch film, then strapped with steel bands. Each pallet typically holds 1–1.5 tons. Pallets are loaded into containers — a 20-foot container holds approximately 20–22 tons, a 40-foot container holds 26–28 tons. Custom packaging (plywood crates for fragile custom shapes) is available on request.
Standard payment terms: 30% advance by T/T (telegraphic transfer), 70% balance against copy of Bill of Lading. For long-term customers and repeat orders, we offer L/C at sight and flexible terms. Quotation is in USD FOB Qingdao or CIF destination port — let us know your preferred Incoterms.
Each shipment includes: (1) XRF chemical analysis report for each batch, (2) physical property test certificate covering refractoriness, cold crushing strength, apparent porosity, bulk density, and permanent linear change, (3) dimensional inspection report, (4) ISO 9001 certificate copy. Third-party inspection (SGS, BV, Intertek) can be arranged at the customer's request and expense.
Yes. We produce custom-shaped fire clay bricks from customer drawings in PDF, DWG, DXF, or hand-drawn format with dimensions. Our engineering team reviews each drawing for pressing feasibility, mold design requirements, and firing considerations, then provides a quotation including mold cost and unit price. Standard mold cost is credited back on orders exceeding 10 tons of the same shape.
Technical Information
→ View Full Fireclay Refractory Brick Technical Guide: Properties, Grade Selection & ApplicationsSend your grade requirement, quantity, and drawings — we respond within 12 hours.
Get Quote Now
Al₂O₃ Content: 65–75% Refractoriness: Above 1770°C Tapered Geometry For Curved & Arched Refractory Linings Custom Sizes · Angles · Shapes Made to Drawing
Kiln firebrick is a shaped refractory brick engineered to line the hot faces, working linings, and transition zones of industrial kilns. Manufactured from calcined bauxite, fire clay, and high-purity alumina, pressed at 1500 tons and fired at 1400–1600°C, kiln firebricks deliver refractoriness up to 1790°C, cold crushing strength ≥30–70 MPa, and thermal shock resistance ≥15 cycles. Highland supplies 10+ kiln brick grades — including high alumina kiln bricks, silica kiln bricks, magnesia kiln bricks, fireclay kiln bricks, mullite insulation kiln bricks, and silicon carbide kiln bricks — covering cement rotary kilns, glass melting furnaces, ceramic tunnel kilns, blast furnaces, and incineration kilns.
