GGG50 ductile iron manhole covers are manufactured using spheroidal graphite cast iron through precision machining and hand molding processes. Available in solid top and recessed designs with single or double seals, these covers feature excellent quality with smooth surfaces free from defects.

• 40-ton loading capacity for heavy-duty applications
• Standard black bitumen coating (30 microns thickness)
• Optional epoxy coating available upon request
• Available in round, square, and rectangular configurations
• Customizable with anti-slip patterns and logo designs
• Optional security features including locks and smart technology

• Material Preparation: High-quality pig iron and scrap iron alloyed with magnesium
• Casting: Precision sand casting for accurate dimensional control
• Heat Treatment: Enhances strength and flexibility
• Surface Coating: Anti-corrosive treatments for extended durability
• Quality Control: Rigorous testing for load capacity, tensile strength, and dimensions

Our ISO9001-certified quality management system ensures consistent product excellence through comprehensive testing including spectrometer analysis, ultrasonic and magnetic testing, permeability and elongation measurements, and tensile/yield strength verification.