Sourced directly from our ISO-certified manufacturing facility, our high-purity Calcium Carbide Lumps in the 25–50 mm grain size are engineered for maximum gas generation efficiency in industrial acetylene plants and steelmaking processes. Mechanically screened to achieve precise, uniform sizing, these 25-50mm lumps ensure smooth and stable feeding into standard acetylene generators while yielding a guaranteed gas volume of ≥ 295L/kg.
Our high-purity calcium carbide lumps in the 25–50 mm grain size are engineered specifically to meet the rigorous demands of industrial acetylene gas generation and metallurgical steelmaking applications. Manufactured through the high-temperature electro-thermal reaction of top-grade quicklime and carbon materials in modern submerged arc furnaces, our solid chemical compound (CaC2) delivers outstanding reactivity, chemical stability, and precise sizing control.
As a certified chemical exporter and factory-direct manufacturer, we supply global B2B buyers, acetylene gas plant operators, and metallurgical foundries with a stable monthly inventory of calcium carbide lumps. The 25-50mm fraction undergoes mechanical screening to eliminate dust and oversized chunks, guaranteeing predictable performance and maximum efficiency in every production batch.
| Technical Parameter | Specification Details |
| Chemical Formula | CaC2 (Calcium Carbide / Calcium Acetylide) |
| CAS Number | 75-20-7 |
| Sizing & Granularity | 25 mm – 50 mm (Uniformly sieved) |
| Gas Yield Rate | ≥295 L/kg (Tested at 20 / 101.3 kPa) |
| Phosphine (PH3) Content | ≤0.08% (v/v) |
| Hydrogen Sulfide (H2S) Content | ≤0.15% (v/v) |
| Hazard Class | Class 4.3 (Dangerous when wet, UN 1389) |
| Packaging Standards | 50 kg / 100 kg UN-approved sealed steel drums with nitrogen purging |
The 25–50 mm sizing represents a versatile, medium-granularity classification widely favored across standard acetylene generating systems. Choosing high-quality calcium carbide lumps in this precise size range offers critical operational advantages:
Faster & More Even Hydrolysis: Compared to larger 50-80mm blocks, the increased surface area of 25-50mm lumps allows for a faster, highly uniform reaction rate in water-to-carbide and carbide-to-water acetylene generators.
Smooth Hopper Feeding: The medium lump size prevents bridging, vaulting, and physical jamming inside automated generator hoppers, ensuring uninterrupted gas production workflows.
Optimized Dissolution for Steelmaking: When used as a desulfurizing agent in metallurgical ladle furnaces, the 25-50mm lumps melt rapidly and react efficiently with molten steel, promoting fast slag formation and sulfur removal.
Industrial Acetylene Gas Production:
Serves as the main chemical feed for producing high-purity acetylene gas (C2H2) utilized in oxy-acetylene metal cutting, welding, flame hardening, and organic chemical synthesis (such as PVC and vinyl compounds).
Ladle Metallurgy & Steel Desulfurization:
Functions as a powerful deoxidizing and desulfurizing agent in steel mills, effectively reducing sulfur levels to meet strict specifications for high-strength steel grades.
Chemical Intermediate Synthesis:
Utilized as an essential raw material in the manufacturing of calcium cyanamide (lime nitrogen), synthetic rubber, and specialty chemical derivatives.
Due to the reactive nature of solid chemical reagents, safe packaging is vital. Our calcium carbide lumps are packaged in strict accordance with international dangerous goods shipping regulations:
Hermetically Sealed Drums: Packed in brand-new, heavy-duty 50kg or 100kg iron steel drums engineered to withstand long-distance ocean transit and physical handling.
Nitrogen Purging Technology: Prior to final sealing, each drum undergoes an inert nitrogen flush to displace ambient air and humidity, preventing oxidation and guaranteeing long shelf life.
Full Regulatory Compliance: Every batch is shipped with complete documentation, including Material Safety Data Sheets (MSDS), Certificate of Analysis (COA), Commercial Invoice, and UN Packaging Certification. Third-party pre-shipment inspections by SGS or Bureau Veritas (BV) are available upon request.
Whether you are seeking containerized shipments (FCL) for chemical distribution or contract supply for your industrial gas plant, we offer flexible FOB, CFR, and CIF pricing structures backed by dependable factory direct production.
Contact our sales engineering team today to request the latest wholesale price list, batch COA documentation, or custom packaging options for 25-50mm calcium carbide lumps.
