1. Material:  500-7 grade ductile iron in accordance with ISO 9001

   2. Standard:  BS EN124-2:2015

   3. Certificate:  ISO9001, SGS, BSI Kite Marks

   4. Outer coating:  asphalt or according to customer requirements

   5. Ductile iron manhole covers are classified into the following grades: A15, B125, C250, D400, E600, and F900