Heavy Duty SMC Sealed Round Manhole Cover EN124 D400 Ø700 Ø760 Ø900

Manufactured from high-performance SMC composite using high-temperature and high-pressure molding, this sealed manhole cover delivers outstanding strength while being up to 50% lighter than traditional cast iron. Compliant with EN124-2015 and GB/T 23858-2009 standards, it features excellent load-bearing performance, a double-sealed design for superior water and gas tightness, and outstanding resistance to corrosion, chemicals, UV exposure, and deformation. With anti-static, anti-theft, rust-proof, and noise-reducing properties, it provides a maintenance-free service life of over 30 years. Ideal for petrochemical plants, utility networks, telecommunications, and other heavy-duty infrastructure applications.

We offer three standard specifications (Ø977, Ø760, Ø700) to meet various municipal and industrial requirements. Below is the detailed technical data for the cover and frame assemblies.

• Material: SMC Composite

• Standard: BS EN 124-5

• Load Class:  D400 (40 Ton)

• Clear Opening Sizes:

  - Φ900 mm (Heavy Duty / Petrol Station)

  - Φ760 mm (Municipal Mainways)

  - Φ700 mm (Utility Chambers)

• Features: Double Seal Gastight, Locking System

SMC Sealed Heavy-duty Round Manhole Cover Ø977

COVER	Specifications	Embedding Depth	Diameter	Load Rating
	Ø977	50	977	D400
FRAME	Specifications	Well Seat Height	Outer Diameter	Clear Opening
	1065	100	1065	900

SMC Sealed Heavy-duty Round Manhole Cover Ø760

COVER	Specifications	Embedding Depth	Diameter	Load Rating
	Ø760	70	760	D400
FRAME	Specifications	Well Seat Height	Outer Diameter	Clear Opening
	865	110	865	680

SMC Sealed Heavy-duty Round Manhole Cover Ø700

COVER	Specifications	Embedding Depth	Diameter	Load Rating
	Ø700	70	700	D400
FRAME	Specifications	Well Seat Height	Outer Diameter	Clear Opening
	800	100	800	630

Exceptional D400 Heavy Load Capacity

Tested to EN124 D400 standards, this heavy-duty cover easily withstands continuous vehicle traffic, making it perfect for main roads and industrial zones.

Vibration Damping & High Wear Resistance

The high-temp molded SMC construction absorbs traffic shocks (Vibration Damping) and prevents surface degradation, ensuring quiet, long-term performance.

100% Waterproof & Corrosion Resistant

Equipped with a specialized waterproof seal ring, it keeps underground networks dry. It is highly resistant to acid, alkali, and severe weather.

Advanced Safety: Anti-Theft & Flame Retardant

Unlike cast iron, composite SMC material has zero scrap value, naturally preventing theft. Furthermore, it is flame retardant, anti-static, and explosion-proof—crucial safety features for Gas, Power, and Petrochemical sectors.

Anti-Deformation Structural Integrity

Our precision molding ensures the cover and frame fit flawlessly. The anti-deformation property guarantees it will not warp under heavy axle loads, providing a reliable, trip-free surface for its entire service life.

Q: What is SMC material, and why is it better than traditional cast iron?

A: SMC stands for Sheet Molding Compound, an advanced fiberglass-reinforced plastic. Compared to cast iron, SMC is significantly lighter (making installation safer and cheaper), possesses zero scrap value (anti-theft), will not rust or corrode, and operates silently without metallic clanking under vehicle traffic.

Q: Does this cover meet international heavy-duty traffic standards?

A: Yes. It strictly adheres to the EN 124-2015 and GB/T 23858-2009 standards, specifically rated for D400 load class. This means it is thoroughly tested to withstand 400kN (approx. 40 Tons) of test load, making it highly suitable for main carriageways, parking lots, and areas with heavy-duty vehicle traffic.

Q: Is this manhole cover suitable for hazardous or sensitive industrial areas?

A: Absolutely. Because the SMC material is high-temp molded, anti-static, flame retardant, and explosion-proof, it is explicitly ideal for high-risk and sensitive environments like the Petrochemical, Power, Gas, and Telecom sectors. Its waterproof seal ring also ensures internal networks are protected from flooding and chemical spills.