Layers of hydraulic hose as shown in figure

Material used for each layer:

• Nitrile or synthetic rubber for petroleum-based hydraulic oil. alternatives like Viton or Teflon are used with synthetic fluids like phosphate ester.
• The cover protects the reinforcement layer. One consideration when determining the cover material is resistance to attack from outside influences like chemicals, salt water, steam, UV radiation and ozone. Common cover materials include nitrile, neoprene and PVC.