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Insulating Fire Bricks

Insulating Fire Bricks
Lightweight Refractory Bricks for Thermal Insulation

Insulating Fire Bricks Manufacturer & Exporter in India

Insulating Fire Bricks for High-Temperature Industrial Applications

At Oryvia Refractories, we offer insulating fire bricks designed for thermal insulation in suitable high-temperature industrial applications. Our insulating refractory bricks combine a lightweight structure with low thermal conductivity, helping reduce heat transfer through furnace and kiln linings when selected for the appropriate application.

Our range includes Grade 20, Grade 23, Grade 25, Grade 26 and Grade 28 insulating fire bricks. Each grade has different chemical and physical characteristics, allowing industrial buyers to evaluate the material according to their temperature requirements, insulation needs and equipment design.
 

Grades

We provide different insulating fire brick grades for varying thermal requirements. Our product specifications include service temperature, alumina content, iron oxide limits, bulk density, cold crushing strength, pyrometric cone values, permanent linear change and thermal conductivity.

Choosing the right grade requires consideration of the complete operating environment rather than temperature alone. We recommend assessing the furnace design, mechanical loading, atmosphere and required insulation performance before finalizing a specification.
 

Industrial Applications 

Our insulating fire bricks are intended for suitable high-temperature industrial insulation applications, including furnaces, boilers and other thermal processing equipment. Their low thermal conductivity and lightweight structure can be useful where heat retention, insulation efficiency and reduced lining weight are important considerations.

We recommend evaluating the application carefully. Direct exposure to abrasion, mechanical impact, molten materials or aggressive furnace atmospheres may require additional consideration when selecting an insulating refractory. The correct installation position and suitable material depend on the equipment design and operating conditions.
 

How to Select the Right Insulating Fire Brick Grade

  • Service requirements: Compare the specified temperature requirements with the intended operating conditions.
  • Thermal conductivity: Evaluate the listed values at relevant temperatures when assessing insulation performance.
  • Density and weight: Consider bulk density when estimating lining weight and insulation design requirements.
  • Mechanical strength: Review cold crushing strength and the mechanical demands of the installation.
  • Chemical composition: Check alumina and iron oxide specifications against the required material properties.
  • Furnace conditions: Consider atmosphere, abrasion, chemical exposure, thermal cycling and installation position.

 

Why choose us

01
Thermal Gradient & Grade Alignment Selecting the right insulating fire brick requires balancing classification temperature, bulk density, thermal conductivity, and crushing strength for each lining layer. Our commercial engineering team reviews your target specification sheet and interface temperature requirements before quoting, helping buyers select the most suitable grade.
02
Complete Multi-Layer Lining Supply Industrial furnaces typically combine lightweight backup insulation with dense hot-face working linings. With Oryvia Refractories, procurement teams can source Insulating Fire Bricks alongside High Alumina Bricks, SK-Series Bricks, Ceramic Fibres, Calcium Silicate Boards, and Refractory Mortars through a single coordinated manufacturer.
03
Multi-Unit Production & Supply Capacity With 3 manufacturing units, our organization is structured to fulfill commercial orders ranging from routine maintenance replacements to multi-container export shipments for international distributors and greenfield furnace installations. We prioritize clear scheduling to align with your shutdown timelines.
04
Grade-Specific Technical Information We provide grade-wise information covering alumina content, iron oxide limits, bulk density, cold crushing strength and other listed properties. Reviewing these parameters helps procurement teams and engineers compare technical requirements before selecting insulating refractory materials for their projects.
Technical Specification

Product Data Sheet For Calcined Bauxite

Perticulars 20- Grade 23- Grade 25- Grade 26- Grade 28- Grade
Service Temperature 1230 ℃ 1250 ℃ 1350 ℃ 1430 ℃ 1510 ℃
Al2O3， ≥ 38% 45% 50% 55% 60%
Fe2O3， ≤ 1% 1% 1% 1% 1%
Bulk Density(gm/cc) max. 0.64 0.77 0.615 0.86 0.96
Cold Crushing Strength, Mpa 1.2 1.8 2.25 2.2 2.2
Pyrometric Cone [ASTM] No.(min) CCSMpa 27 27 29 32 31
PLC at Service Temperature (˚C/3 hrs,max) 0.5 0.5 0.5 0.5 0.5
Thermal Conductivity (kcal/m/hr/˚C max)
200˚C 0.12 0.16 - - -
400˚C 0.14 0.18 0.18 0.27 0.32
600˚C 0.16 0.2 0.19 0.3 0.34
800˚C 0.2 0.23 0.21 0.33 0.35
1000˚C 0.24 0.26 0.23 0.36 0.38
GRITS AVAILABLE:  mm: 0-1, 1-3, 3-5, 0-30, 0-50 Mesh: -200, -325

Frequently Asked Questions

  • What are Insulating Fire Bricks (IFB) and how do they differ from dense refractory bricks?
    Insulating Fire Bricks (IFB) are lightweight, high-porosity refractory bricks engineered with a uniform cellular microstructure that traps air to minimize heat transfer. Unlike dense High Alumina Bricks or SK-Series Fire Bricks—which have high bulk density to resist molten slag, liquid metal, and heavy physical abrasion—Insulating Fire Bricks have low density, low thermal conductivity, and low heat storage. Their primary function is to conserve thermal energy and reduce furnace shell temperatures rather than withstand severe mechanical or chemical wear.
  • Can Insulating Fire Bricks be used as a hot-face working lining inside a furnace?
    Yes, Insulating Fire Bricks can serve as a direct hot-face working lining, provided the furnace atmosphere is clean, dry, and free from molten metal, liquid slag, heavy particulate abrasion, or high-velocity gas erosion. They are widely used as hot-face linings in electric heat-treatment furnaces, annealing furnaces, shuttle and tunnel ceramic kilns, and petrochemical heaters. In furnaces with slag, clinker, or molten metal contact, IFBs must be installed strictly as backup insulation behind a dense working lining.
  • Which industries commonly purchase Insulating Fire Bricks?
    Insulating Fire Bricks for industrial applications are procured across iron and steel plants (blast furnace stoves, reheating furnaces, annealing lines, and ladle covers), petrochemical refineries (process heaters, ethylene crackers, and reformers), ceramic and brick kilns (tunnel, roller hearth, and shuttle kilns), glass manufacturing (regenerator backup walls and annealing lehrs), aluminum carbon baking furnaces, and industrial boiler systems.
  • How do Insulating Fire Bricks compare to Ceramic Fiber Blankets and Calcium Silicate Boards?
    All three are thermal insulation materials, but they serve different structural roles in a furnace lining. Insulating Fire Bricks are rigid, load-bearing ceramic blocks capable of supporting their own weight in self-supporting walls, sprung arches, and hearth sub-layers at high interface temperatures. Ceramic Fiber Blankets are flexible, ultra-lightweight fibrous mats ideal for low-mass linings, expansion joints, and complex contours where structural load-bearing is not required. Calcium Silicate Boards are rigid backup insulation panels typically installed against the cold-face steel shell behind brick or castable layers.
  • Why is iron oxide (Fe2O3) content important when selecting Insulating Fire Bricks?
    In furnaces operating with reducing atmospheres—such as those containing carbon monoxide (CO), hydrogen (H2), or cracked hydrocarbon gases common in heat-treatment and petrochemical furnaces—iron oxide impurities inside a refractory brick can act as a catalyst for carbon deposition or undergo chemical reduction, leading to internal stress and brick disintegration. For reducing or controlled-atmosphere furnaces, engineers should specify low-iron Insulating Fire Bricks and confirm the maximum allowable Fe2O3 content with Oryvia Refractories.
  • What technical parameters should buyers provide when requesting a quotation from Oryvia Refractories?
    To receive a fast and accurate B2B quotation, buyers should specify the required classification temperature grade (or standard industry grade designation), target bulk density, cold crushing strength, thermal conductivity limits at mean temperatures, iron oxide limits (if used in a reducing atmosphere), brick dimensions or tapered shape codes, total quantity, and preferred delivery or export terms (such as FOB or CIF destination port).
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