Global leader for SMC composite manhole covers, gully gratings, handholes and FRP poles — engineered to EN124, AASHTO and AS3996 standards, exported to over 100 countries.
Hangzhou Ombra Trading Co., Ltd is a national high-tech enterprise specializing in the design, R&D, production and marketing of high-strength SMC composite manhole covers and chambers, gully gratings, handholes, pedestals, valve boxes and FRP poles — with a manufacturing heritage dating back to 1999.
SMC (Sheet Molding Compound) is a thermosetting composite — resin, glass-fibre reinforcement and fillers, compression-moulded under heat into a high-density, steel-like plate.
Density of 1.7–1.9 g/cm³, with an R&D lightweight variant reaching just 1.1 g/cm³.
Combines plastic-like molding flexibility with bending and tensile resistance far beyond conventional plastics.
A proprietary anti-shrinkage formulation holds shrinkage to 0.2% — ten times better than cast iron's 2%.
Exceptional resistance to aging, corrosion and microbial degradation extends field life significantly.
Anti-static, flame-retardant, high-voltage resistant, UV-stable and electromagnetically transparent formulations on request.
Unlike cast iron, SMC has no resale value as scrap — removing the financial incentive for theft entirely.
Relative structural performance across the four properties tested during material qualification.
| Flexural strength | 155 MPa |
| Flexural modulus | 12,500 MPa |
| Tensile stress at break | 103 MPa |
| Compressive strength | 192 MPa |
| Water absorption | 0.08% |
| Barcol hardness | 63 |
| UV exposure (48h) | Grey grade 4–5 |
| Surface resistance | 1.7×10¹⁴ Ω |
Per SGS / BSI third-party test reports
A sample from six product families. Every item ships in custom sizes, load classes and colors on request.
High-visibility siting · weather-resistant finish
Dual-pole mount · lighting & cable carriage
Product load capability is classified A15 through F900 according to installation site. Click a class to see where it applies.
Areas which can only be used by pedestrians and pedal cyclists.
30+ industry experts, multiple self-developed invention and utility model patents, and a provincial-level "High-tech Enterprise R&D Center" designation.
3D modeling, FEA simulation and mold design before a single part is cut.
Powder moisture, resin viscosity and gel-time testing on every batch.
Rotorless curemeter and Karl Fischer titration monitor the molding process itself.
Universal testing machine and digital pendulum impact tester on in-process parts.
CNC servo fatigue rig and QUV accelerated weathering before a cover ships.
From national-level cross-sea bridge projects in China to telecom rollouts across East Africa.
Composite handholes and covers deployed for telecom network expansion across Kenya.
EN124 C250-rated pipeline covers supplied along the East African crude oil pipeline route.
Composite handhole housing a splice closure for a Danish telecom fiber rollout.
Lightweight composite drainage covers specified for a UK bridge infrastructure project.
A composite cover installed alongside a rusted iron cover on Spain's seafront — same exposure, different fate.
Composite covers in service across multiple US municipal water and sewer utilities.
TRUSTED BY
Send drawings, a load class, or just a description of the site — we'll come back with pricing and lead time.
