Low Cement Castable

Low cement castable is a castable that carries a lower amount of cement. It starts from cement, silicates, high performance admixtures, mineral admixtures and water. Topower mixes these raw materials in a set proportion and stirs them until the mix is uniform. Workers then pour the mix into position for cast-in-place construction. A standard refractory cement castable carries 15% to 20% cement. This product carries about 5%, and some mixes drop to 1% to 2%. The purpose of cutting the cement is to raise the fire resistance of the material. The grade is built on rheological principles, tightest packing theory and ultra-fine powder technology. The result is low porosity, small pore size, high density, good volume stability, high strength and low water addition. It also removes the sharp strength drop that ordinary castables show between 800°C and 1,200°C, and strength keeps rising as temperature rises, so the lining handles thermal shock better. The doubled thermal shock resistance of the furnace body comes from the same tight packing and ultra-fine powder.

Four service properties stand out in this product: high density, low porosity, good hot strength, and high refractoriness with high softness. It also resists mechanical peeling and impact, carries strong corrosion resistance and shows a low wear rate. Tight packing and ultra-fine powder lift density and cut pore size, so the lining stands up to the mechanical peeling and the impact of a working furnace.

Seven grades are available: MLC-45, MLC-55, MLC-60, LC-75, LC-80, LC-85 and LC-95. The grade number tracks Al2O3. MLC-45 holds Al2O3 of 45% with an application limit temperature of 1,580°C. MLC-55 holds Al2O3 of 55% and reaches 1,600°C. MLC-60 holds Al2O3 of 60% and reaches 1,650°C. LC-75 holds Al2O3 of 75% and reaches 1,650°C. LC-80 holds Al2O3 of 80% and reaches 1,700°C. LC-85 holds Al2O3 of 85% and reaches 1,750°C. LC-95 holds Al2O3 of 95% and reaches an application limit temperature of 1,800°C.

Bulk density runs 2.4 g/cm3 at MLC-45, 2.5 g/cm3 at MLC-55, 2.55 g/cm3 at MLC-60 and LC-75, 2.6 g/cm3 at LC-80, 2.7 g/cm3 at LC-85 and 3 g/cm3 at LC-95. Water for casting runs 5-7% for MLC-45, MLC-55 and MLC-60, 7-9% for LC-75 and LC-80, 6-8% for LC-85 and 6-7% for LC-95. Max grain size is 6 mm for every grade. CaO holds 2-3% across the range. Fe2O3 runs 1.5% at MLC-45, MLC-55 and MLC-60, 2.4% at LC-75, 2% at LC-80, 1.8% at LC-85 and 1.5% at LC-95. Broadly, the MLC grades cover the lower Al2O3 band and the LC grades cover the higher band, so the LC grades fit the hotter and more corrosive service.

Performance climbs with the grade. Cold crushing strength at 1,100°C x 3h runs 90 MPa for MLC-45, 100 MPa for MLC-55, 110 MPa for MLC-60, 75 MPa for LC-75, 80 MPa for LC-80, 90 MPa for LC-85 and 95 MPa for LC-95. At 1,400°C x 3h it runs 120 MPa for MLC-45, 130 MPa for MLC-55, 150 MPa for MLC-60, 80 MPa for LC-75, 85 MPa for LC-80, 100 MPa for LC-85 and 110 MPa for LC-95. Choose by the hottest zone first, then by the chemical load. Match the application limit temperature to the furnace, then check Al2O3 against the slag and metal in contact. Send your furnace data and Topower will confirm one grade.

The product ships as a dry mix in bags for cast-in-place work. Max grain size is 6 mm across the range. The mix can be poured into a lining or formed into a shape before use. [TO CONFIRM: bag weight and packing size options] [TO CONFIRM: maximum pour thickness and curing schedule] Custom work covers aggregate and binder choice, water reduction and setting time. Tell the plant the lining shape and the working temperature, and the mix is set before shipping.

The material suits power station boilers and other thermal kilns.
Front and back arches
Furnace roofs
Rear furnace walls
Heat treatment furnaces
Various heating furnaces
Shaft kilns
Machinery
Iron blast furnace tapholes
Ladle linings

packing type, pallet and container loading details

Q1. Is the name with a hyphen the same product? Yes. The hyphen is a spelling variant, and some buyers use the short form LCC.

Q2. How much cement does the mix contain? About 5%. A standard refractory cement castable carries 15% to 20%, and some low-cement mixes drop to 1% to 2%.

Q3. What temperature can the material work at? The range runs from 1,580°C for MLC-45 to 1,800°C for LC-95.

Q4. What is the MOQ, and can I get a sample and a price? MOQ is 5 tons. Send your grade (MLC-45 to LC-95), quantity, and destination port, and we will return a quotation.

Q5. Why is less water better? Low water addition lifts density, lowers porosity and raises strength. Water for casting runs 5% to 9% by grade.

Q6. Where is the material used? Power station boilers, furnace roofs and walls, heat treatment furnaces, heating furnaces, shaft kilns, iron blast furnace tapholes and ladle linings.

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