The best quality and faith bring us the good market, such as USA, CANADA, BRAZIL, AUSTRALIA, UK, GERMANY, ITALY,        SPAIN,    TURKEY, ALGERIA, DUBAI, RUSSIA, UKRAINE, SINGAPORE, MALAYSIA etc. “Made in DUNHUI” in many Countries.

   “DUNHUI” is your correct choice. Welcome to visit 

1.    ISO 9001 High security Manhole Cover 

Made of ductile iron.
Certified by the City of Zaragoza.
According to UNE EN-124, Class C-250 norm.
Black paint coating.
Non slip metal surface.
Suitable for roadsides and parking areas.

2.  Products description and Main dimensions

3. Production process

Raw Material Inspection

• Raw Material inspection including chemical
• components analysis, tensile strength test and etc. 

Quality Control Groups

• Dimensions Test
• Manufacture process Inspection
• Process Inspection including sand cleaning, assembling, packing and coating
• Final Inspection including delivery marks and etc.
• Particular Tests for different products, such as Load Test, Hydro Test and etc. 

Laboratory

• Chemical Components
• Microstructure Test
• Tensile Strength

4. Manhole cover and Gratings pictures

5. Technical Standard: 

 Design: EN124
 Certification: ISO9001:2008 

 6. Personnel station:

  Have professional salesmen, and 6 Engineers, More than 30 inspectors. 

 7. Quality and Safety:

We have a very strict and complete quality control system, which promises that goods we produced are always of the best quality, the enough inspectors to ensure that each product can meet the quality requirements of customers. We do the final inspection in own factory with ISO 9001:2008.

8.Location:

 DUNHUI has a convenient location at the city’s exporting business zone, Dongli District. We are only 9 km to Tianjin  International Airport, and very close to major highways,TIANJIN port. We look forward to work with your business!