Rongjian supplies refractory brick in fireclay and high-alumina grades, for lining furnaces, kilns and other high-temperature plant. A refractory brick is a fired, shaped block of alumina and silica that holds its strength and shape at temperatures that would melt or soften ordinary materials, so it forms the hot face and the structure of the furnace itself. The grade is set by alumina content: more alumina means a higher working temperature and better resistance to slag and wear.
Fireclay brick runs Al₂O₃ 40 to 48% and suits general furnace and kiln lining at lower cost. High-alumina brick runs Al₂O₃ 48 to 75%, with a refractoriness of 1770 to 2000°C, and goes into the hotter, harder-worked zones of blast furnaces, hot blast stoves, glass tanks and cement kilns. We make standard straight bricks and arch, wedge and key shapes, and cut special shapes to drawing. Lightweight insulating brick is available where the wall has to hold heat in.
Typical specifications for Rongjian refractory brick, in fireclay and high-alumina grades. The grade is chosen by working temperature, atmosphere and slag load; sizes and shapes are made to the furnace. Standard straight bricks, arch, wedge and key shapes and custom shapes are all supplied.
| PROPERTY | FIRECLAY BRICK | HIGH ALUMINA BRICK |
|---|---|---|
| Al₂O₃ Content | 40–48% | 48–75% |
| SiO₂ Content | 50–65% | 20–48% |
| Refractoriness | ≥1690°C | 1770–2000°C |
| Refractoriness Under Load (0.2 MPa) | ≥1350°C | ≥1420°C |
| Apparent Porosity | ≤24% | ≤23% |
| Bulk Density | ≥2.1 g/cm³ | ≥2.3 g/cm³ |
| Cold Crushing Strength | ≥25 MPa | ≥45 MPa |
| Max Service Temp | ~1400°C | ~1500–1600°C |
| Shapes | Straight, arch, wedge, custom | Straight, arch, wedge, custom |
Refractory brick lines the furnaces and kilns of heavy industry, wherever a wall has to stand up to high heat, load and slag. The four duties below cover most of what buyers order it for.
We have supplied refractory brick since 2010, out of Jiangxi in China, to steel, glass, cement, ceramic and power plants around the world. Because we make both fireclay and high-alumina grades and cut to drawing, the brick is matched to the furnace zone and the temperature rather than forced to fit one stock size.
We hold the standard grades and shapes and make special shapes to your furnace drawing, with the grade chosen from the working temperature, the atmosphere and the slag. Standard supply runs by the pallet up to full furnace linings by the tonne, with the test report shipped against the order and a reply on quotes within a day.
A furnace is not all straight walls, so the brick is made in the shapes the structure needs. Standard straights build the flat walls; arch and wedge bricks taper to turn a roof, an arch or the curve of a circular vessel; and skews, keys and custom shapes close off the awkward corners. Carrying the full shape range means a lining is built from bricks that fit the geometry, with little cutting on site.
Where a furnace has its own geometry, the brick is pressed or cut to your drawing rather than trimmed on site. We work from the lining drawing to make the special shapes a roof, a port, a burner block or a taphole needs, so the pieces arrive numbered and ready to lay. That keeps the joints tight and the lining sound, which is what gives a furnace lining its life.
We ship refractory brick to over a hundred countries, by the pallet up to full furnace linings by the tonne. Because brick is heavy, it is stacked, strapped and shrink-wrapped on stout pallets that take the weight and the handling, and weatherproofed for the sea, so a lining arrives whole and ready to install. From a sample pallet to a full furnace charge, the order is packed and documented for export.
We are a factory, not a trading company. Every product ships from our own production lines in Pingxiang. You deal with the people who actually make the product.
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Refractory brick lines furnaces, kilns, boilers and other high-temperature plant. It forms the hot face and the structure that holds the heat in, carries the load of the furnace and stands up to slag, dust and thermal cycling. Steel, glass, cement, ceramic and power plants all run on it.
The difference is the alumina content. Fireclay brick runs lower on alumina and suits general lining at lower cost, while high-alumina brick runs higher on alumina, takes more heat and resists slag and wear better, so it goes into the hotter, harder-worked zones. We match the grade to the furnace.
It depends on the grade. Fireclay brick has a refractoriness above sixteen hundred and ninety degrees, and high-alumina brick reaches from seventeen hundred and seventy up toward two thousand degrees. The working temperature in service is set lower than the refractoriness, with a margin for the load and the slag.
Choose by the working temperature, the furnace atmosphere and how much slag and abrasion the wall sees. A hotter, harder-worked zone needs a higher-alumina brick; a cooler, general wall can use fireclay; and where the wall has to hold heat in, an insulating brick goes behind the hot face. Tell us the furnace and the zone and we recommend the grade.
Dense brick is strong and resists slag and abrasion, so it forms the hot face that touches the heat and the charge. Insulating brick is lightweight and full of fine pores, so it holds heat in and keeps the outside of the wall cooler, but it is softer. Most linings use both: a dense hot face backed by insulating brick.
Yes. We make standard straight bricks and the arch, wedge and key shapes a furnace needs, and we cut special shapes to your drawing. Size, shape and grade are set to your furnace, so the brick lays up tight without excess cutting on site. Send the drawing and the duty and we quote the set.
The minimum order depends on the grade and shape, and full furnace linings ship by the tonne while standard bricks ship by the pallet. Lead time runs from stock for standard sizes to a few weeks for special shapes. Send the grade, shape and quantity and we will confirm both on the quote.
Refractory brick is the fired, shaped block that lines a furnace or kiln. Made from alumina and silica, it holds its strength and shape at temperatures that would melt ordinary brick, so it forms both the hot face that meets the heat and the structure that carries the furnace. The grade is set mainly by alumina content, which fixes the working temperature and the resistance to slag and wear.
Fireclay brick, at Al₂O₃ 40 to 48%, is the economical workhorse for general furnace and kiln lining at moderate temperature. High-alumina brick, at 48 to 75% alumina, costs more but takes more heat, carries more load at temperature and resists slag and abrasion better, which is why it goes into blast furnaces, hot blast stoves, glass tanks and cement kilns. The more alumina, the higher the grade.
Three numbers describe how hot a brick can run, and they are not the same. Refractoriness is the temperature at which the brick itself softens, above 1690°C for fireclay and from 1770 toward 2000°C for high alumina. Refractoriness under load is lower, the temperature at which the brick deforms while carrying a load, which is what limits a real furnace wall. Service temperature is set lower still, with a margin for the load, the slag and the thermal cycling. Choosing on refractoriness alone is the common mistake; the load and the duty set the real limit.
Dense refractory brick is strong, low in porosity and resists slag and abrasion, so it forms the hot face. Insulating fire brick is lightweight and full of fine pores, which gives it low thermal conductivity so it holds heat in and keeps the shell cooler, but it is softer and not for direct slag or abrasion. A good lining uses both: a dense hot face backed by an insulating layer that cuts the heat loss and the fuel bill.
Beyond the standard straight brick, a furnace needs arch, wedge and key shapes to turn an arch or a circle, and often special shapes cut to drawing for burners, ports and corners. Brick is laid with a matching refractory mortar or, in some linings, dry and keyed. Getting the shapes right means the lining lays up tight, with thin joints, which is where a lining is strongest and lasts longest.
Match the brick to the working temperature, the furnace atmosphere and the slag and abrasion the wall sees. The table below sets out the common grades by alumina content, so the choice can be made on the duty.
| GRADE | Al₂O₃ | REFRACTORINESS | TYPICAL USE |
|---|---|---|---|
| Fireclay | 40–48% | ≥1690°C | General furnace and kiln lining |
| High alumina LZ-48 | ≥48% | ≥1770°C | Kilns, ladles, blast furnace |
| High alumina LZ-65 | ≥65% | ≥1790°C | Hot blast stoves, glass tanks |
| High alumina LZ-75 | ≥75% | up to ~2000°C | High-wear, high-temperature zones |
What makes a lining last is the right grade laid in the right shape, with consistent brick. Bricks are checked for alumina content, refractoriness, porosity and crushing strength, and the test report ships with the order. We supply by the pallet up to full furnace linings by the tonne, and cut special shapes to drawing so the brick fits the furnace it is built for.
