Custom SK36 SK37 SK38 SK40 High Alumina Brick Industrial Fire Brick

Custom SK36 SK37 SK38 SK40 High Alumina Brick

High-Temperature Industrial Fire Bricks for Kilns, Furnaces & Boilers

Our Custom SK36, SK37, SK38, and SK40 High Alumina Bricks are engineered for high-temperature industrial applications. Manufactured from premium-grade bauxite and other high-purity raw materials, these fire bricks are ideal for lining kilns, furnaces, incinerators, and other demanding thermal environments. Offering exceptional thermal shock resistance, mechanical strength, and customizable shapes and sizes, our alumina bricks are the trusted solution for long-lasting, cost-efficient refractory linings.
Technical Specifications

Parameter	Value	Standard
Al₂O₃ Content	55% – 85%	GB/T 2997 & ASTM C573
Refractoriness	≥ 1770°C (≥ 3236°F)	ISO 528
Thermal Expansion Coefficient	5.8 × 10⁻⁶ /°C	ASTM E228

Key Selling Points:

✅ High alumina content (55%–85%) | ✅ Refractoriness ≥1770°C | ✅ Excellent thermal shock resistance

✅ Low porosity (≤18%) | ✅ Resistant to acid and alkali corrosion | ✅ 30% longer service life
Parameter:

Item	SK-36	SK-37	SK-38	SK-40
Al₂O₃ % (≥)	55	65	70	82
Fe₂O₃ % (≤)	2	2	2	2
Refractoriness(SK)	36	37	38	40
0.2MPa Refractoriness Under Load, °C (≥)	1450	1480	1530	1600
Apparent Porosity,((%)	21~25	21~25	21~24	20~23
Density (g/cm³)	2.25~2.4	2.3~2.5	2.4~2.6	2.5~2.7
Cold Crushing Strength, MPa(≥)	45	50	60	70