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Triple Weathering Protection System SMC Square Manhole Cover 300x300mm

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300x300mm SMC Square Manhole Cover

Elite's 300x300mm SMC Square Manhole Cover is designed for underground utility access, municipal infrastructure, electrical systems, telecommunications, drainage facilities and other outdoor engineering applications. Manufactured from glass-fiber-reinforced Sheet Molding Compound (SMC), it combines corrosion resistance, electrical insulation, relatively low weight and molded structural performance in a non-metallic access cover.

This model is available in B125 and C250 load classes, allowing contractors, distributors and project procurement teams to select the appropriate configuration according to the installation zone and project specification.

Quick Specification:    300x300mm cover size | 240x240mm clear opening | 375x375mm frame | B125 / C250 | 10.0 kg

Key Features

1. Electrical Insulation for Utility Applications

SMC is a non-metallic composite material with good electrical insulation properties. Compared with conventional metallic access covers, it can be advantageous in electrical utility chambers, cable networks, substations and other installations where reducing electrical conductivity is an important design consideration.

For projects with specific insulation requirements, customers should provide the required technical parameters or applicable standard so that the corresponding product documentation can be confirmed before ordering.

2. Non-Metallic Construction for Communication Infrastructure

The glass-fiber-reinforced composite structure does not rely on a large metallic cover body. This makes SMC suitable for telecommunications, underground monitoring systems, smart utility infrastructure and other applications where corrosion resistance and non-metallic material characteristics are preferred.

3. Triple Weathering Protection for Outdoor Use

Outdoor manhole covers may be exposed to moisture, sunlight, temperature changes, road contaminants and corrosive environments throughout their service life. The SMC composite structure is designed to address these common outdoor conditions.

  • Moisture and corrosion resistance: the composite body does not rust like conventional ferrous materials.

  • Outdoor environmental resistance: molded SMC is suitable for applications exposed to changing weather and temperature conditions.

  • Reduced coating dependence: corrosion resistance comes primarily from the composite material itself rather than relying only on an external anti-corrosion coating.

For coastal, chemical, high-humidity or other demanding environments, please provide the actual operating conditions during the RFQ stage so that the material and product configuration can be reviewed accordingly.

4. Lightweight Composite Structure

This 300x300mm model has a listed weight of approximately 10.0 kg. Compared with many traditional cast-metal access covers, the lower handling weight can simplify transportation, positioning, installation and routine maintenance.

Dimensions and Load Classes

The product is available in two listed configurations. The required load class should be selected according to the actual installation area, expected loading conditions, project drawings and applicable local requirements.

300x300mm SMC square manhole cover dimensional drawing

Code Load O D F h H Weight
SS300B B125 240x240 mm 300x300 mm 375x375 mm 37 mm 57 mm 10.0 KG
SS300C C250 240x240 mm 300x300 mm 375x375 mm 37 mm 57 mm 10.0 KG
Installation Note:    The 300x300mm value refers to the cover dimension. The listed clear opening is 240x240mm and the complete frame size is 375x375mm. Confirm the chamber opening and frame footprint before ordering.

B125 or C250: Which Version Should You Choose?

Dimensions alone are not enough when specifying a manhole cover. The required load class must also match the installation location and expected loading conditions.

The SS300B version is listed as B125, while the SS300C version is listed as C250. If the project specification does not clearly identify the required load class, customers should provide the installation location, expected traffic conditions and project drawings for technical review.

Typical Applications

  • Electrical utility chambers

  • Underground cable access systems

  • Telecommunication networks

  • Municipal infrastructure

  • Water and drainage systems

  • Industrial facilities

  • Commercial infrastructure

  • Smart utility and monitoring projects

Why Use SMC for Manhole Covers?

SMC, or Sheet Molding Compound, is a fiber-reinforced thermoset composite used in applications that require mechanical performance, corrosion resistance, electrical insulation and molded design flexibility.

For underground access products, its main practical advantages include:

  • Corrosion resistance: the composite body does not rust in the same way as conventional ferrous covers.

  • Electrical insulation: useful in many electrical and utility environments.

  • Lower handling weight: helps simplify transportation and installation.

  • Molded design flexibility: supports different dimensions, markings, colors and surface configurations.

  • Outdoor suitability: suitable for infrastructure environments exposed to moisture and changing weather.

Custom SMC Manhole Cover Solutions

In addition to standard products, Elite provides customized SMC molding solutions for infrastructure and industrial projects. Custom requirements may include dimensions, load performance, surface pattern, molded logo, identification marking, color, locking structure or other project-specific features.

For customized products, customers are encouraged to provide drawings, required dimensions, installation conditions, load requirements, estimated quantity, destination market and any required testing or documentation.

Learn more about our custom SMC molding capabilities.

Manufacturing and Quality Control

Elite New Materials focuses on SMC and BMC composite products and states that it has more than 20 years of experience in the building materials industry. The company supplies composite products for infrastructure and other engineering applications.

For manhole covers, dimensional consistency, material formulation and structural performance are important parts of project acceptance. Elite's quality inspection system covers raw materials, manufacturing processes and finished products.

For projects requiring specific standards or test documentation, customers should identify those requirements during the RFQ stage so that the applicable technical documents can be confirmed for the exact model being purchased.

View more information about quality inspection and technical support.

Delivery & Shipping

Elite supports both standard and customized product delivery. The current product page lists approximately 30 days for standard-product shipment, while customized-order lead times are confirmed according to the specification and production requirements.

For international orders, customers should provide the required quantity, destination country or port, packaging requirements and target delivery schedule when requesting a quotation.

SMC manhole covers being loaded for shipmentBulk composite manhole covers prepared for international shipping

Customer Cases & Feedback

For infrastructure and distribution projects, technical communication, stable product quality, production coordination and delivery reliability are important factors in long-term cooperation.

The following images are retained from actual customer communications already displayed on this product page.

Customer feedback about cooperation with Elite New MaterialsCustomer feedback regarding Elite New Materials professionalism

Environmental & Social Responsibility

Elite continues to develop SMC and BMC composite products for applications where corrosion resistance, durability and reduced maintenance can contribute to long-term infrastructure use.

The company also participates in community and social-service activities as part of its broader corporate responsibility efforts.

Elite New Materials team participating in community service activitiesElite New Materials community support activity

What to Provide for a Quotation

  • Required cover size or clear opening

  • Required B125, C250 or other load class

  • Installation location and application

  • Expected traffic or loading conditions

  • Required quantity

  • Project drawing or chamber dimensions

  • Color, logo or other customization requirements

  • Required test reports or certification documents

  • Destination country or port

  • Required delivery schedule

Frequently Asked Questions

What is the actual opening size of this 300x300mm manhole cover?

The listed clear opening is 240x240mm. The cover dimension is 300x300mm, while the complete frame dimension is 375x375mm.

Is this SMC manhole cover available in B125 and C250?

Yes. SS300B is listed as B125 and SS300C as C250. The correct option should be selected according to the project specification and installation environment.

Why choose SMC instead of a conventional metal manhole cover?

SMC provides a non-metallic, corrosion-resistant and electrically insulating composite structure with relatively low handling weight. These characteristics make it suitable for many utility, telecommunications and infrastructure applications.

Can Elite customize the manhole cover?

Yes. Depending on project feasibility, customization can include dimensions, surface patterns, colors, molded logos, markings and other structural or application-specific requirements.

Can you provide testing or technical documentation?

Documentation availability depends on the exact product, load class and project requirement. Customers should provide the applicable standard and required documents before ordering so that Elite can confirm the available technical information.

Contact Elite for Your SMC Manhole Cover Project

Whether you require the standard 300x300mm B125 or C250 model or a customized SMC access cover, our team can review your application, drawings, required load class, quantity and delivery requirements before quotation.

Contact Elite New Materials for a quotation or explore more SMC composite manhole covers.

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Elite New Materials is a leading provider of advanced SMC (Sheet Molding Compound) products, backed by over 20 years of dedicated experience in the building materials industry.

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