# Firebrick

> Fireclay and high-alumina firebrick and insulating firebrick sourced to ASTM C27 and C155, in straights and special shapes, and request details.

URL: https://jjprojectsok.com/products/refractory/firebrick-stack  
Español: https://jjprojectsok.com/es/products/refractory/firebrick-stack  
Updated: 2026-10-16

Shaped fireclay or high-alumina brick laid with mortar to form a refractory lining.

**In short:** Shaped fireclay or high-alumina brick laid with mortar to form a refractory lining. JJ Projects sources it to the specification the buyer names. Typical reference, standards: ASTM C27 (fireclay and high-alumina brick), ASTM C155 (insulating firebrick).

## Specification references

- Standards: ASTM C27 (fireclay and high-alumina brick), ASTM C155 (insulating firebrick)
- Shapes: Straights and special shapes per drawing
- Service: Select by operating temperature and atmosphere

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- Hot-face linings in furnaces, kilns and fired heaters
- Boiler, incinerator and stack linings
- Repairs and relines of existing brick-lined equipment
- Back-up insulating layers behind denser hot-face material

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. Brick type and class, for example fireclay, high-alumina or insulating firebrick, with the ASTM C27 class or the alumina content if specified
2. Shapes: standard straights, or special shapes and arches per drawing
3. Maximum operating temperature and atmosphere, such as oxidizing, reducing or slagging
4. Quantity in pieces or weight, and packaging, for example palletized
5. Matching mortar: type, setting and the quantity needed
6. Documents: manufacturer's data sheet and any test reports required

[Request this item](https://jjprojectsok.com/request-a-quote?item=firebrick-stack)

## Questions

### What is the difference between dense firebrick and insulating firebrick?

Dense firebrick resists heat, abrasion and slag and is used on the hot face. Insulating firebrick is lighter and has low thermal conductivity, so it saves heat, but it is weaker and less resistant to abrasion and slag. They are often used together in layers.

### How do I choose the brick class?

By the maximum temperature, the atmosphere and any slag or chemical attack in the equipment. The lining designer or refractory supplier makes the selection. Send the operating data with the request.

### Does the brick come with mortar?

Mortar is ordered separately and matched to the brick and the service. State the mortar type and quantity in the request so the installation is complete.

## Related items

- [Lined wall system](https://jjprojectsok.com/products/refractory/lined-wall-section): Anchored layered refractory wall systems for fired heaters, reformers and boilers, referencing ASTM C401, API 936 and API 560, and what a lining request needs.
- [Refractory anchor](https://jjprojectsok.com/products/refractory/v-anchor): Metallic and ceramic refractory anchors, including V-type, that hold monolithic linings to the shell, with API 936 installation control and request details.
- [Shell-and-tube heat exchanger](https://jjprojectsok.com/products/valves-process-equipment/shell-tube-exchanger): Shell-and-tube heat exchangers fabricated to your thermal datasheet to TEMA and ASME Section VIII, and what the request needs, by TEMA type and tubes.

## Guides

- [Refractory lining basics: materials, anchors](https://jjprojectsok.com/knowledge/refractory-lining-basics): How refractory linings work in heaters, boilers and reformers: dense and insulating castables, firebrick, ceramic fiber, anchors, and why dry-out matters.
- [How to write an RFQ for industrial materials](https://jjprojectsok.com/knowledge/how-to-write-an-rfq): What an RFQ for industrial materials must specify: item, size, schedule or class, grade, standard, quantity, MTRs, inspection, packing and Incoterm.

[All refractory](https://jjprojectsok.com/products/refractory)