Ramming Mass

Ramming mass is a dry granular refractory that is rammed in place to form the lining of induction furnaces, ladle bottoms and cupola furnaces. After ramming and sintering it forms a monolithic sintered lining without joints. It is installed dry, rammed manually or pneumatically, rather than mixed with water like a castable.

Ramming mass is rated for maximum service temperatures of 1650°C to 1750°C, depending on the type. The limit depends on the chemistry of the mass and on the metal and slag being melted, so the type should be chosen to suit the furnace duty and the melt.

Silica and quartzite ramming masses are acidic, silica-based linings, with SiO2 above 96% for the silica type, while dolomite ramming mass is basic, with MgO above 85%. The choice depends mainly on the metal and slag chemistry in the furnace, because an acidic lining and a basic slag, or the reverse, react with each other.

Ramming mass is typically supplied as a 0-6 mm graded aggregate. The graded mix of coarse and fine particles packs densely when rammed, giving a sintered density of 2.2 to 3.0 g/cm³ depending on type. Keep the mass dry and avoid segregating the fines during handling so the lining compacts evenly.

Ramming mass is placed dry in layers and compacted manually or pneumatically around a former, then sintered by a controlled first heat to form a monolithic lining. Even compaction in each layer is important to avoid weak zones. The heating schedule should follow the furnace operator's practice for the type of ramming mass used.

Ramming mass is a dry granular material rammed and sintered in place, mainly for induction furnace linings, while Castable Refractory is mixed with water and cast, gunned or pumped for furnace roofs, walls, ladles and shaped parts. Ramming mass suits linings in direct contact with molten metal in induction furnaces; castable suits a wider range of furnace structures.

Ramming mass in this catalogue is referenced to ASTM C862. Selection is based on type, chemistry, grain size and service temperature, so share your furnace type, capacity and the metal being melted. If you need specific test documentation for an order, ask in your enquiry and we will confirm what is available.

Ramming mass is exported under HS code 38160000, covering refractory cements, mortars, concretes and similar compositions, including dolomite ramming mix. Silica, quartzite and dolomite types are all declared under this heading, the same one used for Castable Refractory and Refractory Mortar in a mixed refractory shipment.

Ramming mass is packed in 25 kg or 50 kg HDPE bags, which help keep the dry granular material free of moisture in transit. It ships FCL or LCL from Nhava Sheva (JNPT) or Mumbai under EXW, FCA, FOB, CFR or CIF terms. In your enquiry, give the type, quantity in tonnes and destination port.