Technical Specification of the 20′ ISO 1CC Steel Dry Cargo Container

Shipping containers of the ISO 1CC type represent a standardized unit for international cargo transport, designed according to the strict standards of the International Organization for Standardization (ISO). The 20′ x 8′ x 8’6″ type 1CC container is one of the most widely used container types in global logistics due to its versatility and ability to transport a wide range of cargo. This container type is designed for maritime transport (on deck and below deck), road and rail transport worldwide. The container is designed to withstand extreme temperatures ranging from -40°C to +70°C without affecting the strength of the basic structure and watertightness. It meets the requirements of international standards including ISO 668, ISO 1496-1, CSC (Convention for Safe Containers), TIR and other certifications necessary for safe and efficient transport.

Dimensions, Weights and Load Capacity of the 1CC Container

Precise adherence to dimensional tolerances is key to the compatibility of containers with various means of transport and handling equipment. The 1CC type container has standardized external dimensions with minimal tolerances that ensure trouble-free stacking and handling.

The maximum permitted difference between two diagonals on any surface (roof, floor, sides) must not exceed 13 mm for side and roof diagonals and 10 mm for front and rear diagonals. This precision ensures correct stacking of up to 9 containers on top of each other in ship cells and 4 containers on deck with steel wire rope securing.

Construction and Materials Used

The 1CC type container is constructed from a steel frame with fully vertically corrugated steel side panels and front wall, horizontally corrugated steel double-leaf doors at the rear end, a pressed steel roof and corner fittings. All external welds including the base frame are performed by continuous CO₂ shielding gas welding, while internal welds are performed by intermittent welding with a minimum weld length of 15 mm.

The base frame consists of two bottom side rails and a total of 19 cross members. Each bottom side rail is made from a 50×160×30×4.5 mm thick cold-formed steel “U” profile. The cross members are made from pressed steel profiles measuring 45×122×45×4.0 mm for standard areas and 75×122×45×4.0 mm for floor joint areas, with the larger profiles reinforced by three stiffeners of 4.0 mm thickness.

The floor consists of six pieces of 28 mm thick 19-layer hard plywood boards (wood species: Apitong or other hardwood), laid longitudinally on the cross members. The floor boards are firmly fastened to individual cross members using galvanized self-tapping screws (shank diameter 8.0 mm × head diameter 16 mm × length 45 mm), with each cross member secured by four screws, and five screws in joint areas. The screw heads are recessed approximately 2 mm below the upper floor surface. Base insulation made of mineral wool is installed beneath the wooden floor.

Certifications and International Standards

The 1CC type container meets the strict requirements of international standards and certifications that ensure safety, quality and compatibility with global logistics systems. Compliance with these standards is essential for the legal transport of goods across international borders.

ISO Standards (type 1CC):

• ISO 668 – Classification, external dimensions and load capacity of Series 1 freight containers
• ISO 830 – Terminology relating to freight containers
• ISO 1161 – Specification of corner fittings for Series 1 containers
• ISO 1496-1 – Specification and testing of Series 1 containers, Part 1: General purpose containers
• ISO 6346 – Coding, identification and marking of freight containers

TIR Certification (Transports Internationaux Routiers):
All containers are certified and meet the requirements of the “Customs Convention on the International Transport of Goods under Cover of TIR Carnets” or the “Customs Convention on Containers”. The container is equipped with customs seal and padlock holes on each locking handle bracket to cover the sealed area in accordance with TIR requirements.

CSC Certification (Convention for Safe Containers):
All containers are certified and meet the requirements of the “International Convention for Safe Containers”. The CSC certification plate is made of stainless steel and is chemically acid-etched. The plate is permanently attached to the door using stainless steel rivets, with the entire perimeter except the bottom side sealed with sealant.

TCT Certification (Timber Component Treatment):
All exposed wooden components used in the container are treated in accordance with the requirements of “Freight Containers – Quarantine Aspects and Procedures” of the Australian Department of Health. The wood is treated with the preservative MEGANIUM 2000 or equivalent, with the average wood moisture content before installation being 12%.

UIC Registration (Union Internationale des Chemins de fer):
All containers are registered and meet the requirements of the “International Union of Railways” for rail transport.

Classification Societies:
All containers are certified for construction type and individually inspected by a classification society such as Bureau Veritas (BV) or Lloyd’s Register (LR).

Testing, Quality Control and Warranty Conditions

Before being put into service, each prototype container must undergo rigorous testing under the supervision of a classification society. Testing ensures that the container can withstand the extreme loads and conditions it will be exposed to during its service life.

Note:

• R = Maximum Gross Weight
• T = Tare Weight
• P = Maximum Payload

Warranty Conditions:

1. Structural Warranty:
All containers are guaranteed by the manufacturer to be free from defects in materials, workmanship and construction for a period of one (1) year from the date of acceptance of the container by the buyer.

2. Coating System Warranty:
The coating system applied to the container surface is guaranteed to be free from corrosion and failure for a period of five (5) years from the date of acceptance of the container by the buyer. Corrosion is defined as rusting that exceeds RE3 (European rust grade scale) on at least 10% of the total surface of the container, with the exception of damage caused by impact, abrasion, contact with solvents or corrosive chemicals, and abnormal use.

3. Decal Warranty:
Decals applied to the container are guaranteed for a period of seven (7) years without peeling, tenting or color fading, provided the decals are supplied by the manufacturer. The decals are made from self-adhesive, high-strength PVC film.

Surface Treatment, Anti-Corrosion Protection and Insulation

High-quality surface treatment is key to the long service life of the container and protection against corrosion in the demanding conditions of maritime transport. All steel components are shot-blasted to the SA 2.5 standard using an automatic centrifugal shot-blasting machine before forming. Immediately after blasting, a weldable primer compatible with the coating system is applied at a thickness of 10 microns to preserve surface integrity during the assembly process.

Coating System:

External Surface:

1. One coat of epoxy zinc primer – 10 μm DFT (Dry Film Thickness)
2. One coat of water-borne epoxy zinc primer – 20 μm DFT
3. One coat of water-borne epoxy intermediate coat – 40 μm DFT
4. One coat of water-borne acrylic topcoat – 40 μm DFT

Total thickness: 110 μm

Internal Surface:

1. One coat of epoxy zinc primer – 10 μm DFT
2. One coat of water-borne epoxy zinc primer – 20 μm DFT
3. One coat of water-borne epoxy interior topcoat – 40 μm DFT

Total thickness: 70 μm

Understructure:

1. One coat of epoxy zinc primer – 10 μm DFT
2. One coat of water-borne epoxy zinc primer – 15 μm DFT
3. Water-borne undercoat – 200 μm (steel parts) / 100 μm (floor boards)

Total thickness: 225 μm (steel parts)

All door hardware is hot-dip galvanized with a thickness of approximately 75 microns. All fasteners such as self-tapping screws, hinges, cams, keepers and fixing elements are electro-galvanized with a thickness of approximately 13 microns.

Insulation:
The container is equipped with thermal insulation to protect cargo from extreme temperatures:

• Roof insulation: 60 mm thickness, mineral wool (rock wool) with a density of 70 kg/m³, galvanized steel cover sheet 1.5 mm
• Side insulation: 60 mm thickness, mineral wool with a density of 70 kg/m³, galvanized steel cover sheet 1.5 mm, support angles 2.0 mm
• Door insulation: 50 mm thickness, mineral wool with a density of 70 kg/m³, galvanized steel cover sheet 1.5 mm, fastened with stainless steel rivets
• Base insulation: Mineral wool between the cover sheet and the wooden floor

Sealing:
Every floor perimeter, all overlapping joints on the interior side, all bolt and nut holes and all locations where water could penetrate are sealed to prevent water ingress. Interior sealing is applied after the watertightness test.

Sealing materials used:

• Chloroprene / water-borne sealant (cargo contact area)
• Butyl sealant (concealed parts)

The door seal is made from extruded triple EPDM rubber of J-C type (vertical and top are “J” type, bottom is “C” type) with a corner seal in the upper left corner of the right door for improved watertightness. The seal is installed on the door perimeter frames using stainless steel seal retainers and fastened with stainless steel rivets at a spacing of 150 mm. The door seal must be sealed with butyl sealant before installation on the door frames.

20′ ISO 1CC

The 20′ ISO 1CC steel dry cargo container represents a high-quality and certified transport unit that meets all international standards and safety requirements. Thanks to its precise construction, quality materials, thorough testing and advanced coating system, it ensures a long service life and reliable cargo protection in the most demanding conditions of global logistics. The container is designed for stacking up to 9 containers on top of each other, withstands extreme temperatures and provides excellent protection against corrosion and weathering for a minimum of 5 years.