Product Overview & Technical Specs

Dual-end access combined with extra vertical clearance. The High Cube Double Door Container (tunnel container) features standard ISO dimensions with full-opening cargo doors welded to both end frames. Built to 9'6" external height, it accommodates oversized industrial equipment, palletized freight requiring FIFO (First-In, First-Out) handling, or machinery requiring drive-through and walk-through access.

Technical Specifications

Parameter	20' High Cube Double Door	40' High Cube Double Door
External Dimensions (L x W x H)	6,058 x 2,438 x 2,896 mm (20'L x 8'W x 9'6"H)	12,192 x 2,438 x 2,896 mm (40'L x 8'W x 9'6"H)
Internal Dimensions (L x W x H)	5,844 x 2,352 x 2,698 mm	12,032 x 2,352 x 2,698 mm
Door Opening Width x Height	2,340 x 2,585 mm	2,340 x 2,585 mm
Cubic Capacity	37.4 m3 (1,321 cu.ft)	76.4 m3 (2,698 cu.ft)
Tare Weight	2,450 kg (5,401 lbs)	4,180 kg (9,210 lbs)
Max Gross Weight (Rating)	30,480 kg (67,200 lbs)	30,480 kg (67,200 lbs)
Max Payload	28,030 kg (61,799 lbs)	26,300 kg (57,990 lbs)

Material & Structural Engineering

Corrosion-Resistant Steel: Corten-A (SPA-H) weathering steel utilized for structural posts, roof bows, ISO 1161 corner castings, and corrugated side/end panels. Minimum yield strength: 345 MPa.

Dual End-Frame Reinforcement: Engineered portal frames at both ends compensate for the removal of a solid end wall, maintaining torsional rigidity during heavy crane lifts and multi-tier vessel stacking.

Flooring Construction: 28mm marine-grade apitong or bamboo composite panels, treated with insecticide and fungicide, secured via countersunk self-tapping screws to heavy-gauge cold-formed steel crossmembers. Tested to 7,260 kg forklift axle load per ISO 1496-1.

Door Sealing System: EPDM rubber gaskets (triple-lip profile) compressed by heavy-duty galvanized cam-and-lock gear sets on both end doors, preventing water ingress during high-pressure maritime transit.

Manufacturing & Quality Control

Surface Preparation:

Raw steel plates undergo automatic shot blasting to ISO 8501-1 Sa 2.5 standard prior to fabrication to eliminate mill scale and ensure optimal paint adhesion.

Welding Standards:

Structural and seam welds executed by certified operators under AWS D1.1 and EN ISO 3834 standards, utilizing automated MIG/MAG equipment for penetration consistency.

Coating Specification:
Zinc-rich epoxy primer (35 um)
Intermediate epoxy coat (35 um)
Acrylic polyurethane topcoat (40 um)
Total Dry Film Thickness (DFT) >= 110 um. Salt spray corrosion resistance tested to ASTM B117 (1,000+ hours without blistering).

Rigorous Testing Protocol:
Watertightness Test: High-pressure rotating water jet test applied to door seals, roof seams, and side panels.
Dimension & Squareness Check: Diagonal tolerance verified within +/- 3 mm across corner castings.
Lifting Test: 4-point vertical top-lift proof load test per ISO requirements.

Compliance & Certifications

CSC Safety Approval: Each unit certified in accordance with the International Convention for Safe Containers (CSC) and issued a verified CSC plate.

Classification Society Inspection: Third-party inspection reports available upon request (BV, ABS, LR, or CCS).

ISO Standards Compliance: Manufactured strictly to ISO 668 (Classification, dimensions, ratings), ISO 1496-1 (Specification and testing for series 1 freight containers), and ISO 1161 (Corner fittings).

Application Scenarios

FIFO Industrial Inventory Storage: Dual end doors eliminate the need to empty an entire container to access items loaded first; utilized for jobsite tool cribs and spare parts depots.

Long Cargo Transport: Accommodates steel pipes, timber, or structural extrusions exceeding standard single-door loading angles.

Modular Conversions: Serves as a baseline chassis for mobile laboratories, emergency generators, or site security booths requiring entry and exit separation.

Procurement & Logistics Guide

Minimum Order Quantity (MOQ):

1 Unit (Depot pickup) / 10 units (Factory direct batch production).

Packaging & Delivery:

Shipped as single units or bundled in stacks of 3 or 4 (configured as 20' or 40' equivalent structures) for ocean transport efficiency (cellular vessel compatible).

Customization Options:
Custom RAL exterior colors and corporate logo stenciling.

Lockbox installation for high-security padlocks.

Additional ventilation louvers or electrical knock-outs.

FAQ

Q: Does having doors on both ends reduce the structural strength of the container?

A: No. Engineering calculations and physical prototype testing incorporate reinforced steel corner posts and portal headers at both ends. The container retains its full rating for 9-tier high stacking (when empty/loaded per ISO standards) and multi-modal transport loads.

Q: What is the exact paint system used for marine environments?

A: A three-layer marine-grade coating system consisting of a zinc-rich epoxy primer, build coat, and acrylic polyurethane topcoat is applied, achieving a minimum dry film thickness of 110 um designed to withstand coastal salt-fog exposure.

Q: Are these containers certified for international rail and ocean freight?

A: Yes. Every unit leaves the factory with a valid CSC safety approval plate and meets ISO 668 and ISO 1496-1 specifications for international intermodal transport across road, rail, and sea.

Q: Can we inspect the units prior to final shipment?

A: Yes. Buyers or nominated third-party inspectors (such as SGS, BV, or Intertek) can conduct pre-shipment inspections (PSI) at the manufacturing facility covering dimensions, weld integrity, paint thickness, and watertightness tests.