Silica Bricks - Premium Refractory Solution for Coke Ovens, Glass Furnaces, and Hot Blast Stoves

Silica brick is an acidic refractory material primarily composed of silicon dioxide (SiO2) with a content of ≥93%. It is manufactured through a high-temperature firing process. Its mineral composition mainly consists of cristobalite and tridymite. Silica brick has a high refractory temperature and strong resistance to acidic slag erosion but has weak resistance to alkaline slag.

Characters of Silica Bricks:

•High Refractoriness:Silica bricks have a refractoriness of up to 1710-1730℃, making them suitable for high-temperature environments such as steelmaking furnaces and glass melting kilns.

•High-Temperature Volume Stability:At high temperatures, silicon dioxide transforms into cristobalite and tridymite, resulting in minimal volume change. This ensures long-term stability and resistance to deformation under prolonged high-temperature use.

•Resistance to Acidic Slag Erosion:Silica bricks exhibit strong resistance to acidic slags (such as those with high SiO2 content) but have poor corrosion resistance to alkaline slags (CaO, MgO, etc.).

•Low-Temperature Brittleness:Below 600℃, phase transformation (quartz → tridymite) may cause volume expansion, requiring careful temperature control during heating.

Typical Applications of Silica Bricks:

•Coking Furnace: Furnace walls and furnace roofs in the carbonization chamber and combustion chamber.

•Glass Melting Furnace: High-temperature areas such as the furnace roof and breast wall.

•Hot Blast Stove: High-temperature sections such as checker bricks and arch roofs.

•Ceramic Kiln: High-temperature firing zone structures.

•Electric Steel Furnace: Furnace roof and some parts of the furnace walls.

Parameters of Silica Bricks:

Ordinary Silica Brick
Item	GZ-93	GZ-94	GZ-95	GZ-96
SiO2(%)≥	93	94	95	96
Fe2O3(%)≤	1.6	1.4	1.2	1.0
Refractoriness(℃)≥	1690	1710	1710	1710
Apparent Porosity(%)≤	25	23	22	22
Cold Crushing Strength (MPa)≥	19.6	24.5	29.4	29.4
0.2MPa Refractoriness Under Load(℃)≥	1620	1640	1650	1660
True density(g/cm³)≤	2.39	2.39	2.39	2.39

Silica Bricks for Coke Ovens
Item	Furnace Bottom	Furnace Wall	Other
SiO2(%)≥	94.5	94.5	94
Apparent Porosity(%)≤	22	22	24
Cold Crushing Strength (MPa)≥	40	35	28
0.2MPa Refractoriness Under Load(℃)≥	1650	1650	1650
Permanent Linear Change After Heating(1450℃*2h)/%	0~0.2	0~0.2	0~0.2
True density(g/cm3)≤	2.33	2.33	2.34
Thermal Expansion(1000℃)/%≤	1.28	1.28	1.3

Silica Bricks for Hot Blast Stove
Item	Dome Wall Brick	Checker Brick
SiO2(%)≥	95	95
Apparent Porosity(%)≤	22(24)	24
Cold Crushing Strength (MPa)≥	40(30)	30
0.2MPa Refractoriness Under Load(℃)≥	1650	1650
True density(g/cm3)≤	2.33	2.34
Thermal Expansion(1000℃)/%≤	1.26	1.26
0.2MPa/1550℃ Creep Rate(0 h 50 h)≤	0.8	0.8

Q1: Are you a manufacturer or trading company?

A1:We are a professional manufacturer of refractory bricks and materials with over 20 years of experience.

Q2:Can you provide samples?

A2:Yes, free samples are available. Customers only need to cover the shipping cost.

Q3: What is your delivery time?

A3:Generally 15–20 days after receiving the deposit. For urgent orders, please contact us for a faster solution.

Q4:Do you accept OEM or customized orders?

A4:Yes, we offer OEM services and can produce according to your drawings or specifications.

Q5: How do you ensure product quality?

A5:We have strict quality control procedures from raw material selection to final inspection. All products are tested before delivery.

Q6:What payment methods do you accept?

A6:We accept T/T, L/C, and other secure payment methods.