You are here:Home > Bricks | Refractories > Kiln Building Refractory Bricks / Insulating Firebrick
Choose a sub category:
HARD BRICKS : Dense Fire Brick Silicon Carbide Bricks for Industrial Applications SOFT BRICKS / Insulating Firebrick / IFB

Fire Bricks

Kiln Building Refractory Bricks and Insulating Firebrick for Furnace Building and Repair.


Insulating Fire Brick IFBThere are two main types of high temperature fire brick: Soft brick (IFB) Insulating Fire Brick and Hard or Dense Fire Brick.
Both types are made of refractory fire clay, alumina to make it more refractory (resistant to heat), and grog which is ground up, pre-fired clay. Grog helps limit the expansion and contraction that fire bricks go though in heating a cooling cycles.

Dense FireBrickDense fire bricks are very heavy at about 8 pounds each. Dense firebrick resists abrasion and chemical atmospheres so these are used in wood burning kilns and furnaces, salt and soda kilns, as well as in power plant fire boxes.
Insulating Fire Brick (IFB or Soft Bricks) are porous and light weight at about 4 pounds apiece. They usually pale yellow and that is generally lighter in color than dense bricks which are are a more orange tan color. IFB are used in electric and gas kilns and furnaces where abrasion and chemical attack are not a factor. If you can stick your finger nail in a brick then you have Insulating Firebrick.

Various Firebrick shapesBoth insulating and dense fire bricks are available in a large number of standard tapered and straight shapes.
The basic sizes of start with dimensions of 9x4.5x2.5" or 9x4.5x3". There are many tapered versions (Arch bricks and Wedge bricks) of either size for creating arches and circles with eithr 9" thickness or 4.5" thickness.
There are also Split Bricks which are half thickness : 9x4.5x1.25"

With our decades of experience, let the experts at Sheffield Pottery guide you to the correct bricks for your project!


Refractory shapes include precast cement and fused or sintered refractory products that are formed prior to installation in furnaces, boilers or other high temperature equipment. Refractories are hard, heat resistant materials and products such as alumina, silicon carbide, fire clay, bricks, precast shapes, cement or monolithics and ceramic kiln furniture. Ceramics and refractories have high melting points are suitable for applications requiring wear resistance, high temperature strength, electrical or thermal insulation or other specialized characteristics.

Kiln building refractory fire bricks, blocks, and tiles are stacked to form insulating furnaces, boilers or other thermal process vessel walls. The refractory fire bricks are usually cemented together with refractory mortar.

Shown top is a new gas kiln made with soft refractory fire bricks from Sheffield Pottery by John Zetner of New Hampshire Potters Guild.


INSULATING FIRE BRICKS Aka : SOFT BRICKS, IFB



CHOOSE SOFT BRICKS FOR INDOOR OR WELL COVERED AREAS : Used in Gas and electric Kilns

2 1/2” and 3" Series: STRAIGHTS , WEDGES AND ARCHES
G20 = 2000 degrees F
G23 = 2300 degrees F
G26 = 2600 degrees F
G28 = 2800 degrees F
Note: Soft bricks can be cut with a regular carpenter's hand saw to create custom shapes.


HARD BRICKS


CHOOSE HARD BRICKS FOR OUTDOOR APPLICATIONS : Used for wood burning kilns. Soda kilns generally require 70% alumina hard fire bricks.

HIGH HEAT DUTY
-Economical high-duty refractory fire bricks will go to cone 31-32. Suitable for backup linings, and other areas that encounter moderate operating temperatures. Not suggested for abrasive conditions. (equivalent to Empire) 2 1/2” except where * (3”)

SUPER DUTY -Exhibits high strengths and low shrinkage, good resistance to thermal shocks. Can be used as the inside lining of kiln. Recommended for blast furnace stoves, open hearth and coke oven checkers, glass tanks and anywhere a high density, low porosity super duty brick is desired. Will go to cone 33-34. (equivalent to Clipper) 2 1/2” except where * (3”)


70% ALUMINA -A chemical and ceramic bonded 70% alumina brick designed for the following applications: Electric furnace roofs, ladle bottoms, side walls and slag lines, rotary kilns, cement kilns, torpedo ladles, tundishes, and hot zones of lime kilns.

SOFT BRICKS HARD BRICKS

TEMP--->

G20/

2000F

G23/

2300F

G26/

2600F

G28/

2800F

HHD
Cone 31.5
SD
Cone 33.5
70%Alumina
Cone 38
Shape

Size in Inches

Straights
2.5
NC23 NC26 NC28 LVHHD LVSD LVA70
3
NC233 NC263 NC283 LVHHD3
Wedge #1
2.5 NC20W1 NC23W1 NC26W1 NC28W1 LVHHDW1 LVSDW1 LVA70W1
3 NC203W1 NC233W1 NC263W1 NC283W1
Arch #1
2.5 NC20A1 NC23A1 NC26A1 NC28A1 LVHHDA1 LVSDA1 LVA70A1
3 NC203A1 NC233A1 NC263A1 NC283A1
Arch #2
2.5 NC20A2 NC23A2 NC26A2 NC28A2 LVHHDA2 LVSDA2
3 NC203A2 NC233A2 NC263A2 NC283A2
Arch #3
2.5 LVSDA3
3
Soaps
2.5 LVHHDSO LVSDSO
3
Side Skews 2.5 LVHHDSS48
3
Feather Edge

2.5 LVSDFE
3
Splits

2.5 LVHHDSP
3





Note: there are no drawings of the 3 inch series bricks so here are the dimensions:
3 inch brick dimensions


Sort By:
Page of 1
LVHHD: HIGH HEAT Hardbrick FireBrick-STRAIGHTS High Heat Hardbrick FireBrick Straights 2.5"

LVHHD: HIGH HEAT Fire Brick -STRAIGHTS 2.5"

Our Price: $3.16
NC23: G-23 SOFTBRICK-STRAIGHTS Nc23: G-23 Softbrick-Straights

NC23: G-23 SOFTBRICK-STRAIGHTS

Our Price: $4.03
LVSD: SUPER DUTY Hardbrick FireBrick-STRAIGHTS Super Duty Hardbrick FireBrick-Straights 2.5"

LVSD: SUPER DUTY Fire Brick -STRAIGHTS 2.5"

Our Price: $4.21
High Heat Hardbrick Firebrick -Straight 3" High Heat Hardbrick Firebrick -Straight 3"

LVHHD3: HIGH HEAT Fire Brick S-STRAIGHT 3"

Our Price: $4.24
NC233: G-23 Soft Brick IFB Insulating Firebrick STRAIGHTS-3" G-23 Soft Brick IFB Insulating Firebrick Straights-3"

NC233: G-23 SOFTBRICK STRAIGHTS-3"

Our Price: $4.31
LVSDA1: SUPER DUTY Hardbrick FireBrick ARCHES #1 Super Duty Hardbrick FireBrick- #1 Arches 2.5"

LVSDA1: SUPER DUTY Fire Brick  ARCHES #1 2.5"

Our Price: $4.39
LVSDA1: SUPER DUTY Hardbrick FireBrick ARCHES #2 Super Duty Hardbrick FireBrick- #2 Arches 2.5"

LVSDA1: SUPER DUTY Fire Brick  ARCHES #2 2.5"

Our Price: $4.39
NC26: G-26 Soft Brick IFB Insulating Firebrick STRAIGHTS Nc26: G-26 Soft Brick IFB Insulating Firebrick Straights

NC26: G-26 SOFTBRICK STRAIGHTS

Our Price: $4.45
Super Duty Hardbrick FireBrick Straights 3" Super Duty Hardbrick FireBrick Straights 3"

SUPER DUTY Fire Brick  STRAIGHTS 3"

Our Price: $4.60
NC263: G-26 Soft Brick IFB Insulating Firebrick STRAIGHTS 3" G-26 Soft Brick IFB Insulating Firebrick Straights 3"

NC263: G-26 SOFTBRICK STRAIGHTS 3"

Our Price: $4.64
LVSDA1: SUPER DUTY Hardbrick FireBrick ARCHES #3 Super Duty Hardbrick FireBrick- #3 Arches 2.5"

LVSDA1: SUPER DUTY Fire Brick  ARCHES #3 2.5"

Our Price: $4.71
SUPER DUTY Hardbrick FireBrick-WEDGES #1 Super Duty Hardbrick FireBrick-#1 Wedge 2.5"

LVSDW1: SUPER DUTY Fire Brick -WEDGES #1  2.5"

Our Price: $4.83
Super Duty Hardbrick FireBrick #2 Wedge 2.5" Super Duty Hardbrick FireBrick #2 Wedge 2.5"

SUPER DUTY Fire Brick  #2 WEDGE 2.5"

Our Price: $4.83
NC23A1: G-23 Soft Brick IFB Insulating Firebrick ARCHES #1 G-23 Soft Brick IFB Insulating Firebrick Arches #1

NC23A1: G-23 SOFTBRICK ARCHES #1

Our Price: $5.17
NC23A2: G-23 Soft Brick IFB Insulating Firebrick ARCH #2 G-23 Soft-brick Arch #2

NC23A2: G-23 SOFTBRICK ARCH #2

Our Price: $5.17
NC28: G-28 Soft Brick IFB Insulating Firebrick STRAIGHTS G-28 Soft-brick Straights

NC28: G-28 SOFTBRICK STRAIGHTS

Our Price: $5.82
NC283: G-28 Soft Brick IFB Insulating Firebrick STRAIGHTS 3" G-28 Soft Brick IFB Insulating Firebrick Straights 3"

NC283: G-28 SOFTBRICK STRAIGHTS 3"

Our Price: $6.90
KILN BRICK REPAIR KIT Kiln Brick Repair Kit

KILN BRICK REPAIR KIT

Our Price: $54.00
   
 
Kiln Building Refractory Bricks and Insulating Firebrick from Sheffield Pottery Ceramic Supply