FRP Manhole Covers | FIBROTOPS | High-Strength Composite Access Covers

Engineering Specification

Load Test Table (BS EN 124 / AASHTO)

FIBROTOPS manhole covers are designed and tested to withstand exact load rating guidelines.

Group	Class Rating	Proof Load	Traffic & Installation Description
Group 1	Class A15 (ELD 2.5T)	15 kN / 25 kN	Area which can only be used by pedestrians and cyclists.
Group 2	Class LD 5T	50 kN	Suitable for use in light vehicle movement areas.
Group 3	Class B125 (MD 10T)	125 kN / 100 kN	Suitable for use in service lanes, car parking lots, etc.
Group 4	Class C250 (HD 20T)	250 kN / 200 kN	Gully tops positioned in the curb side area of roadside channels.
Group 5	Class D400 (EHD 35T)	400 kN / 350 kN	Carriageways of roads, hard shoulders, and highway parking areas.
Group 6	Class E600	600 kN	Areas imposing high wheel loads, e.g., docks and aircraft hangars.

Sizing Chart

Available Sizes Matrix

Standard circular, rectangular, and square dimensions available. Custom sizes manufactured on request.

Circular Covers (Clear Opening)

• 400 mm (16 inches)
• 530 mm (20 inches)
• 600 mm (24 inches)
• 900 mm (36 inches)
• 1200 mm (48 inches)

Rectangular Covers (Clear Opening)

• 600 mm x 450 mm (24 inch x 18 inch)
• 900 mm x 450 mm (36 inch x 18 inch)
• 900 mm x 600 mm (36 inch x 24 inch)
• 900 mm x 1200 mm (36 inch x 48 inch)
• 600 mm x 1200 mm (24 inch x 48 inch)

Square Covers (Clear Opening)

• 300 x 300 mm
• 450 x 450 mm
• 600 x 600 mm
• 750 x 750 mm
• 900 x 900 mm
• 1000 x 1000 mm
• 1200 x 1200 mm
• 1500 x 1500 mm

Overview

High-Strength Fiber Reinforced Polymer Covers & Frames

FRP manhole covers from Fibrotops Composite Pvt. Ltd. are engineered as a modern replacement for conventional cast iron and RCC covers. Manufactured using high-strength Fiber Reinforced Polymer (FRP), these covers offer excellent load-bearing performance, zero corrosion, and a lightweight design, making them ideal for demanding municipal, industrial, and commercial infrastructure projects.

Key Features:

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High Load-Bearing Strength: Suitable for pedestrian to heavy-traffic applications (up to 60 tons).
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Corrosion & Weather Resistant: Performs reliably in coastal and chemically exposed areas.
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Non-Conductive & Spark-Proof: Safe for electrical and gas-sensitive installations.
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Lightweight Construction: Easy to handle, transport, and install on-site (70% lighter than cast iron).
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Theft-Proof Material: No scrap resale value, preventing theft or unauthorized removal.
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Anti-Skid Surface: Textured diamond/checker plate pattern ensures grip in oily or wet conditions.

Technical Data

Technical Specifications & Sizing Matrix

Review standard sizing layouts. Custom configurations and load classes can be engineered based on technical drawing review.

Parameter	Specification Details
Material	High-strength FRP composite made using high-quality resins (Isophthalic/Vinyl Ester) and glass fiber reinforcement matrix.
Design Standards	Compliant with EN 124, AASHTO M 306, IS 1726 / IS 15916.
Load Classes	A15 (1.5T), B125 (12.5T), C250 (25T), D400 (40T), E600 (60T). Custom classifications on request.
Surface Finish	Anti-skid diamond pattern, checker plate, and UV-stabilized protective gel coating.
Color Options	Standard: Black, Grey, Green. Customized RAL colors available on bulk orders.
Security	Integrated anti-theft locking systems, security bolts, and key-operated locks.

Standard Sizing Charts

Square Cover Sizes

• 300 × 300 mm
• 450 × 450 mm
• 600 × 600 mm
• 750 × 750 mm
• 900 × 900 mm
• 1000 × 1000 mm
• 1200 × 1200 mm

Rectangular & Circular Sizes

Rectangular:

• 450 × 600 mm
• 900 × 450 mm
• 900 × 600 mm
• 1200 × 600 mm
• 1200 × 900 mm

Circular (Diameter):

• Ø 530 mm
• Ø 600 mm
• Ø 900 mm
• Ø 1200 mm

Standard clear opening and outer frame technical dimension profile from brochure.

Key Benefits

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Long service life: Extremely resistant to environmental weathering and soil chemicals.
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Enhanced safety: Non-conductive and anti-skid surfaces reduce operator slips.
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Lower life-cycle cost: No replacement due to oxidation or theft. Zero repainting.
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Logistical convenience: Lightweight build simplifies handling and installation.

Target Applications

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Stormwater & Drainage: Durable road-side catch pits and drainage utility pits.
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Sewerage Access: Resistant to sewage acids and H₂S gases.
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Electrical & Telecom: High dielectric strength protects cabling access lines.
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Gas Distribution: Spark-proof material is critical for gas utility inspection.