Biodegradable fluids are great for the environment, but tough on hoses. They seep through ordinary hose tubes, causing cover blisters and sweat.
The result is that it leads to premature and expensive hose failures.
Gates has introduced new EnviroFluid spiral-wire hose. Like Gates industry proven nitrile tube stock that is used in all its wire-braid hose, it is specially designed to handle biodegradable hydraulic fluids and other aggressive oils like synthetic esters, polyglycols and vegetable oils.
Gates introduced EnviroFluid hydraulic hose to the market six years ago. It has finalised the consolidation of the stocked line items of its high-pressure spiral wire hose line to the EnviroFluid construction.
Listed below are the old GxK part numbers and descriptions and their new replacements in the EFGxK. There are several new additional sizes available in the EFGxK range of product.
What is so special about EnviroFluid spiral hose?
The secret is the Nitrile tube. Traditionally spiral-wire reinforced hoses have a Neoprene tube which is often the only option to ensure coupling sealing at high pressures and temperatures.
However, as the compatibility of neoprene with oil is not optimal, some of the more aggressive oils, especially the biodegradable oils, can permeate through the tube and through the various friction layers between the reinforcement layers.
This effect increases with low viscosity oils, high temperatures or when using viscosity improving additives.
Eventually, the oil collects under the cover causing blisters or permeates through the cover causing visible oil traces (sweating).
Gates therefore has developed a special Nitrile based tube, capable of 120°C constant temperature that ensures perfect compatibility, even with aggressive biodegradable hydraulic fluids like synthetic esters, polyglycols and vegetable oils.
What is the difference with the current GxK hoses?
The only difference is in the Nitrile tube. All performance characteristics, such as working pressure, bend radii and flexibility of the current C12M, G3K, G4K, G5K and G6K hoses have remained identical.