Refractory Insulation Materials

Mullite Insulating Firebrick

Type Insulating Firebrick

Class. Temp 1260-1650°C

Hengke mullite insulating firebrick is a lightweight refractory insulation brick for hot-face lining and back-up insulation in industrial furnaces and kilns. It provides low thermal conductivity, low heat storage, good thermal shock resistance, and stable strength for energy-saving furnace lining systems.

Key Advantages

Low thermal conductivity
Low heat storage
Lightweight structure
High crushing strength
Accurate and customizable dimensions

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Key Parameters

Product Type

Insulating Firebrick

Classification Temperature

1260-1650°C

Density Range

600-1000 kg/m³

Grade Variants -- Technical Parameters

Grade Comparison Table

Grade variants and technical parameters for Mullite Insulating Firebrick
Item	HKZ23	HKZ26	HKZ28	HKZ30
Description	Grade 23 Mullite Insulating Firebrick	Grade 26 Mullite Insulating Firebrick	Grade 28 Mullite Insulating Firebrick	Grade 30 Mullite Insulating Firebrick
Classification Temp.	1260°C	1430°C	1540°C	1650°C
Al₂O₃	45%	56%	65%	72%
SiO₂	50%	41%	32%	26%
Fe₂O₃	≤1.0%	≤0.9%	≤0.7%	≤0.6%
Density	600 kg/m³	800 kg/m³	900 kg/m³	1000 kg/m³
Mechanical Strength	MOR 0.9 MPa Cold Crushing Strength 1.2 MPa	MOR 1.5 MPa Cold Crushing Strength 2.0 MPa	MOR 1.6 MPa Cold Crushing Strength 2.6 MPa	MOR 1.7 MPa Cold Crushing Strength 2.8 MPa
Linear Shrinkage	1230°C x 24h ≤0.3%	1400°C x 24h ≤0.5%	1510°C x 24h ≤0.8%	1620°C x 24h ≤0.9%
Thermal Conductivity	400°C: 0.17 600°C: 0.19 800°C: 0.22 1000°C: 0.25	400°C: 0.25 600°C: 0.27 800°C: 0.30 1000°C: 0.33 1200°C: 0.35	400°C: 0.30 600°C: 0.32 800°C: 0.35 1000°C: 0.38 1200°C: 0.39	400°C: 0.38 600°C: 0.40 800°C: 0.41 1000°C: 0.43 1200°C: 0.45

Standard Sizes

Available Dimensions

Standard sizes and packaging for Mullite Insulating Firebrick
Product Code	Standard Size	Packing	Remarks
HKZ23 / HKZ26 / HKZ28 / HKZ30	230 × 114 × 64 mm	Wrapped with films on pallet, or carton packaging	Tolerance: L±1 × W±1 × T±1 mm
HKZ23 / HKZ26 / HKZ28 / HKZ30	230 × 114 × 76 mm	Wrapped with films on pallet, or carton packaging	Tolerance: L±1 × W±1 × T±1 mm
HKZ23 / HKZ26 / HKZ28 / HKZ30	220 × 110 × 60 mm	Wrapped with films on pallet, or carton packaging	Tolerance: L±1 × W±1 × T±1 mm
HKZ23 / HKZ26 / HKZ28 / HKZ30	800 × 500 × 150 mm	Wrapped with films on pallet, or carton packaging	Large size customized size acceptable

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Mullite Insulating Firebrick

Our technical team responds within 24 hours with pricing, availability, and custom specification options. Samples available on request.

24-hour quote response

Samples available on request

Full export documentation included

ISO 9001:2015 Certified · SGS Verified

Mullite Insulating Firebrick

Key Parameters

Grade Variants -- Technical Parameters

Standard Sizes

Industries & Applications

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Mullite Insulating Firebrick