IV Composite Gas Cylinder For Vehicle Clean Energy
13 November 2025
As a critical component in the development of hydrogen fuel vehicles, onboard hydrogen storage technology directly impacts the range, cost, and safety of fuel cell vehicles. Before introducing the manufacturing process of Type IV hydrogen cylinders, it is essential to understand a fundamental concept: the classification of hydrogen cylinder types.
Type I cylinders are all-metal cylinders with a pressure resistance of up to 30 MPa. Type II and Type III cylinders feature a metal liner wrapped with composite materials, allowing the pressure resistance to increase to 70 MPa. Type IV cylinders, on the other hand, have a polymer liner and are fully wrapped with fiber-reinforced resin composite materials, with only the neck made of metal. They are significantly lighter than Type III cylinders while maintaining comparable gas storage pressure.
The main manufacturing process for hydrogen cylinders includes liner formation, liner inspection, fiber winding, label application, curing, surface polishing, and hydrostatic testing. Raw materials such as PA6, high-density polyethylene (HDPE), and PET polyester plastics are commonly used. Mainstream plastic molding techniques include injection molding, rotational molding, and blow molding.
Fiber winding is generally divided into two layers: the inner layer is a carbon fiber winding layer, typically composed of carbon fiber and epoxy resin, while the outer layer is a protective glass fiber layer, usually made of glass fiber and epoxy resin. Finally, the epoxy resin is heat-cured to ensure the strength of the cylinder.
Type IV Hydrogen Cylinder Characteristics:
High Safety:
Hydraulic burst pressure in type tests and batch inspections exceeds 125MPa, far surpassing standard requirements (82.25MPa).
Impact Resistance:
Excellent impact resistance; the cylinder will not explode even under severe impact.
Long Service Life:
Superior fatigue resistance, with over 25,000 pressure cycles at room temperature.
High Cost Efficiency:
20-40% weight reduction, leading to a 15-35% reduction in power costs.
Vehicle Application Scenarios & Configurations:
Light Truck:
Hydrogen Supply System Configuration: 2*190L
Heavy Truck:
Hydrogen Supply System Configuration: 8*210L
Bus:
Hydrogen Supply System Configurations:
6*140L
8*140L
8*170L, 8*140L
Sanitation Vehicle:
Hydrogen Supply System Configuration: 6*170L
Type I cylinders are all-metal cylinders with a pressure resistance of up to 30 MPa. Type II and Type III cylinders feature a metal liner wrapped with composite materials, allowing the pressure resistance to increase to 70 MPa. Type IV cylinders, on the other hand, have a polymer liner and are fully wrapped with fiber-reinforced resin composite materials, with only the neck made of metal. They are significantly lighter than Type III cylinders while maintaining comparable gas storage pressure.
The main manufacturing process for hydrogen cylinders includes liner formation, liner inspection, fiber winding, label application, curing, surface polishing, and hydrostatic testing. Raw materials such as PA6, high-density polyethylene (HDPE), and PET polyester plastics are commonly used. Mainstream plastic molding techniques include injection molding, rotational molding, and blow molding.
Fiber winding is generally divided into two layers: the inner layer is a carbon fiber winding layer, typically composed of carbon fiber and epoxy resin, while the outer layer is a protective glass fiber layer, usually made of glass fiber and epoxy resin. Finally, the epoxy resin is heat-cured to ensure the strength of the cylinder.
Type IV Hydrogen Cylinder Characteristics:
High Safety:
Hydraulic burst pressure in type tests and batch inspections exceeds 125MPa, far surpassing standard requirements (82.25MPa).
Impact Resistance:
Excellent impact resistance; the cylinder will not explode even under severe impact.
Long Service Life:
Superior fatigue resistance, with over 25,000 pressure cycles at room temperature.
High Cost Efficiency:
20-40% weight reduction, leading to a 15-35% reduction in power costs.
Vehicle Application Scenarios & Configurations:
Light Truck:
Hydrogen Supply System Configuration: 2*190L
Heavy Truck:
Hydrogen Supply System Configuration: 8*210L
Bus:
Hydrogen Supply System Configurations:
6*140L
8*140L
8*170L, 8*140L
Sanitation Vehicle:
Hydrogen Supply System Configuration: 6*170L