We offer a wide range of high-quality products supplied directly by the manufacturer.
Fast shipping – dispatch even within 24 hours
Tooltip
Orders placed by 12:00 (with correct details and product availability) are usually dispatched on the same business day. Deliveries are carried out in cooperation with reputable external courier companies. The delivery time depends on the selected carrier as well as the size and weight of the shipment — whether courier or pallet freight.
UK warehouse dispatch – Worldwide shipping
Tooltip
Quick dispatch from our UK warehouse with international shipping available.
Secure payments – Visa, Mastercard, AmEx, PayPal, Apple Pay & Google Pay
Tooltip
All transactions are encrypted and secure. We accept payments via Visa, Mastercard, American Express, PayPal, Apple Pay and Google Pay.
14-day returns guarantee
Tooltip
If you change your mind after receiving your order, you have 14 days to return the goods. Please contact us to request a returns form.
VITCAS Grade 30 Insulating Fire Bricks – High Temperature Insulation 1650°C
VITCAS Grade 30 Insulating Fire Bricks are lightweight, high-alumina refractory bricks designed for demanding industrial thermal insulation applications. With a maximum temperature classification of 1650°C / 3000°F, they are suitable for appropriately designed furnace, kiln and forge linings requiring high refractoriness combined with reduced heat transfer.
Their porous insulating structure provides lower thermal conductivity and reduced heat storage compared with dense refractory bricks. This helps minimise heat loss, reduce lining weight and support efficient heating and cooling cycles. Grade 30 bricks can be used as both primary hot-face insulation and backup refractory lining material, depending on the operating conditions.
Key Features and Benefits
High Temperature Classification: Rated to 1650°C / 3000°F for suitable refractory insulation applications.
High-Alumina Composition: Approximately 72% alumina for demanding high-temperature refractory duties.
Low Thermal Conductivity: Porous brick structure helps minimise heat transfer through furnace and kiln walls.
Low Heat Storage: Reduced thermal mass supports efficient heating and cooling compared with dense refractory linings.
Lightweight Insulating Construction: Lower lining weight and easier cutting and shaping than dense firebricks.
Hot-Face and Backup Insulation: Suitable for different positions within properly designed refractory lining systems.
Applications
Industrial Kilns: Primary insulating linings for suitable high-temperature ceramic and industrial firing equipment.
Heat Treatment and Annealing Furnaces: Insulating refractory brickwork for controlled thermal processing.
Forges and Metalworking Furnaces: Lightweight furnace linings where high temperature resistance and insulation are required.
Hot Blast Stoves: Insulating sections of compatible industrial hot blast systems.
High-Temperature Flue Systems: Insulating brickwork in compatible industrial flue and exhaust installations.
Technical Specifications
Grade: 30 insulating firebrick.
Maximum Temperature Classification: 1650°C / 3000°F.
Nominal Density: 1000 kg/m³.
Alumina Content: Approximately 72% Al₂O₃.
Dimensions: 230 × 114 × 76 mm.
Compatible Refractory Mortars
For setting and jointing Grade 30 insulating firebricks, VITCAS Vitset 45 Refractory Mortar is a recommended option. Where the jointing specification requires a higher temperature-rated mortar, VITCAS Vitset 80 or Vitset 90 may be considered, subject to compatibility with the insulating bricks and overall refractory lining design.
Selection and Installation Considerations
Grade 30 insulating firebricks are particularly suitable where high temperature capability, reduced heat loss and low lining mass are important. Their porous structure provides effective insulation but offers lower mechanical strength and abrasion resistance than dense refractory bricks. They should therefore be selected according to the expected temperature, atmosphere, mechanical loading and exposure to molten materials.
Please note: The 1650°C rating is a material temperature classification and does not automatically establish the maximum continuous operating temperature of a complete lining. These bricks are not generally intended for direct contact with molten metal, glass or slag. Use compatible refractory mortars and follow the approved lining specification.
Hi
Can this be used to insulate a wall of a house ?
Vitcas Insulating Bricks Grade 30 are designed for high temperature applications such as for insulating kilns and furnaces, due to its high temperature resistance of 1650oC/ 3000oF. Therefore, it is not necessarily a suitable insulator for room temperature...
Please, mind that only logged in users can submit questions
What temperature can Grade 30 insulation bricks withstand?
Answer
VITCAS Grade 30 Insulation Fire Bricks have a maximum service temperature of 1650°C. They are intended for demanding high-temperature insulation applications such as industrial kilns, furnaces, forges and flue systems. The complete lining, including the mortar and surrounding refractory materials, must also be suitable for the intended operating temperature.
Question
Are Grade 30 insulation fire bricks easy to cut?
Answer
Yes. Like all our insulation fire bricks, Grade 30 bricks are lightweight and easy to cut with a saw. This makes them easier to shape around lining details than dense fireclay bricks. Mark each cut carefully and handle the finished sections gently because insulation bricks have lower mechanical strength and abrasion resistance than dense refractory bricks.
Question
Which mortar should be used with Grade 30 bricks?
Answer
VITCAS Vitset 45 Refractory Mortar is recommended for setting Grade 30 insulation fire bricks. For applications requiring a mortar with greater temperature resistance, use Vitset 80 or Vitset 90 Refractory Mortar, which withstand temperatures up to 1860°C. The Grade 30 bricks themselves must still remain within their maximum service temperature of 1650°C.
Question
Can Grade 30 bricks form the hot-face lining?
Answer
Yes. Grade 30 insulation bricks are suitable for primary hot-face linings in applications including industrial kilns, forges and annealing kilns. Their lightweight, porous structure provides high-temperature insulation with minimal heat retention. Confirm that the lining will not be exposed to conditions exceeding the brick’s 1650°C service limit.
Question
Can these bricks reduce heat loss from a furnace?
Answer
Yes. Their lightweight porous structure provides thermal insulation that helps reduce heat loss and unnecessary energy consumption. They can be used as back-up insulation in kilns, furnaces and hot blast furnaces, as well as for suitable flue insulation. The effectiveness of the insulation will depend on the complete lining design and installation.
Question
Will a higher-grade mortar increase the brick temperature limit?
Answer
No. Using VITCAS Vitset 80 or Vitset 90 does not increase the Grade 30 brick’s maximum service temperature of 1650°C. These mortars are available where a higher mortar temperature rating is required, but every component must be assessed separately. The completed lining must remain within the lowest applicable temperature limit.
