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Wholesale Grade Calcium Carbide Stone Calcium Carbide for Welding Industrial. Multiple Size Options: Available in 8 sizes ranging from 2-4mm to 80-120mm to suit various welding needs. OEM/ODM Services: Custom logo and design printing available on products for wholesale buyers. Factory Direct Supply: Manufactured by Inner Mongolia Suihua Chemical Group with 20+ years industry experience. Fast Lead Time: Peak and off-peak season delivery within 15 working days. Flexible Payment Terms: Accepts LC, T/T, D/P, and Western Union for secure transactions. Global Shipping: Export via FOB, EXW, CIF, CFR from Shanghai or Tianjin ports.