Part of FRP Manhole Covers Category

Class D400 (40 Tonne) Heavy-Duty FRP Manhole Covers

BS EN 124 & IS 1726 Certified 400 kN Proof Load Engineered Composite Access Covers

Direct Factory Manufacturer

Operating out of our dedicated Bhiwandi facility since 1962 with zero distributor markup.


  • ISO 9001:2015 Certified Production
  • Custom Dimensions & Sizing
  • Rapid PAN India Freight Dispatch

Engineering Overview & Technical Application

Designed for carriageways, arterial city roads, container freight stations, and industrial logistics parks, Rawji Exports manufactures Class D400 (40 Tonne test load) heavy-duty FRP manhole covers. Unlike cast iron covers that crack under heavy axle impact, our composite covers distribute dynamic wheel loads seamlessly across structural cross-ribs.

Technical Parameters

Engineering & Material Specifications

Rigorous quality testing and dimensional accuracy conforming to national and international composite standards.

Load Class BS EN 124 Class D400 / IS 1726 Extra Heavy Duty (400 kN / 40 Tonne Proof Load)
Standard Clear Openings 500mm, 600mm, 750mm, 900mm dia (Circular) & 600x600, 900x900mm (Square)
Frame Construction Heavy-duty monolithic FRP frame with deep keying flange for asphalt bonding
Gasket System Anti-rattle EPDM elastomeric sealing ring (Zero clattering noise under traffic)
Locking Mechanism Integrated stainless steel anti-theft cam lock / boltdown locking arrangement
Surface Pattern High-traction chequered anti-skid diamond pattern (Wet Skid Resistance > 0.6)
Weight Comparison Cover weight approx 22-28 kg (replaces 90-120 kg Cast Iron / Ductile Iron covers)
Approvals Tested and approved for PWD, Municipal Corporations, NHAI & Smart City Projects
Common Queries

Frequently Asked Questions

Detailed technical and commercial answers from our composite product engineering team.

Yes. Class D400 covers are tested to 400 kN (40 metric tonnes proof load) and are certified for continuous heavy commercial vehicle traffic on national highways and container yards.

Our covers feature precision-machined rebates fitted with heavy-duty EPDM rubber gaskets that dampen dynamic vehicular impacts and eliminate the clattering noise common with iron covers.

No. FRP composite material has zero scrap metal value and cannot be melted down, permanently solving the problem of stolen open manholes.

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Direct Factory Dispatch From Bhiwandi Manufacturing Plant Across: Mumbai MMR, Thane, Navi Mumbai, Pune (Chakan, Talegaon, PCMC), Gujarat Industrial Belt (Ahmedabad, Surat, Dahej PCPIR, Ankleshwar GIDC, Vapi), Delhi-NCR, Hyderabad, Bengaluru, Chennai, and PAN India infrastructure projects.