Description

Rubber Components for Oil Hydraulics

Barbieri Rubber produces rubber components for oil hydraulics: rod protections, bellows, flat seals, anti-vibration feet, caps and dedicated protections for hydraulic cylinders, manifolds, pumps, valves and power packs. The most requested compounds in oil hydraulics are NBR for mineral oils, FKM (Viton®) for aggressive synthetic oils and biofuels, EPDM for water and steam.

Typical oil hydraulics requirements

In oil hydraulics, rubber components must resist mineral and synthetic oils, high pressures, temperatures up to 100-150 °C, load oscillations and repeated mechanical stress. Cylinder rod protection is critical to prevent dust, abrasives and moisture from reaching dynamic seals. Static seals on flanges and fittings require molded flat seals with consistent surface quality.

Most requested oil hydraulics components

Most requested components: cylindrical and modular bellows for hydraulic cylinder rod protection, cone bellows for variable-section cylinders, flat seals for pump and manifold flanges, anti-vibration feet for power packs and pumps, cone and round caps for temporary fitting closure during transport and storage, paint protections for steel-structure paint cycles.

Typical compounds for oil hydraulics

NBR (Nitrile) is the standard compound for mineral and hydraulic oils up to 100 °C. FKM (Viton®) is the technical choice for aggressive oils, solvents, biofuels and harsh chemical environments. EPDM is incompatible with oils but suitable for water, steam and glycols. Selection is based on fluid, temperature and stress type.

Compound	Temperature range	Feature	Typical applications
NBR (Nitrile)	-40 / +130 °C	Resistance to mineral oils	Hydraulics, automotive
EPDM	-40 / +100 °C	Water, steam, ozone, UV	Hydraulics, outdoor, photovoltaic
VMQ (Silicone)	-60 / +200 °C	High temperatures	Food-grade, high-T
FKM (Viton®)	-10 / +180 °C	Aggressive oils, solvents	Chemicals, automotive, hydraulics
HNBR	-20 / +160 °C	Oils + high temperature	Heavy-duty hydraulics
NR / SBR	-50 / +90 °C	Mechanical elasticity	Anti-vibration, general purpose

Standard and custom oil hydraulics components

Most oil hydraulics components are available as catalog rubber items, with active tooling and no tooling cost for the customer. For special geometries, dedicated couplings and non-standard compounds, we produce parts on drawing: at least a preliminary drawing from the customer is required. The dedicated mold is manufactured in cooperation with our trusted toolmaking partners. ISO 9001 certified production with compound traceability.

Frequently asked questions

Which compound should I choose for hydraulic oils?

NBR is the standard choice for mineral and hydraulic oils up to 100 °C. FKM (Viton®) for aggressive synthetic oils and biofuels.

Do you make catalog bellows for hydraulic cylinders?

Yes. Cylindrical, modular and cone bellows are standard catalog rubber components, in multiple diameters and compounds. For non-standard sizes the custom-design version applies.

Do you make molded flat seals for hydraulics?

Yes. Molded flat seals have consistent surface quality. Available in NBR and other technical compounds.

Can I order ISO 9001 certified components?

Yes. Barbieri Rubber production is ISO 9001 certified with compound traceability, process control and conformity documentation on customer request.

Do you produce rubber components for custom cylinders?

Yes. For hydraulic cylinders with special geometries we produce bellows and seals on drawing. At least a preliminary drawing from the customer is required. The dedicated mold is manufactured in cooperation with our trusted toolmaking partners.

Additional information

Applications	In the hydraulic pumps sector, Barbieri specializes in the design and manufacture of rubber seals, rubber membranes and anti-seepage gaskets. The mixes are tested in the field and in the laboratory. With fifty years of experience in this sector, we can now achieve excellent seal results even at high pressures, and prevent seepage even without the aid of additional rigid components. Barbieri’s patented technology allows “flash-free” molding, which delivers a considerable improvement in seal-in rubber components working inside hydraulic pumps. Constant contact with hydraulic fluid obviously requires the use of NBR-based mixes, but high pressures combined with relatively high temperatures, plus the possibility of friction and the need to maintain a perfect seal, often make it necessary to turn towards much more high-performance compounds, that are designed and tested specifically for the pump in question. Barbieri Rubber also produces a series of rubber accessories for hydraulic valves and distributors, such as actuator buttons using rubber-metal co-molding technology, valve or solenoid valve guards, connector covers and simple dust guards that snap onto the body of the valve or distributor, obviously all made of oilproof rubber, also resistant to ozone.
Materials	Compounds that are always oilproof, but are also long-lasting and resistant to acidic or alkaline substances are used for particularly heavy-duty applications, or when it is necessary to achieve high levels of reliability. These compounds are used in power stations, on planes, or for aerospace and railway applications, as material for safety devices, safety valves, deviators, maximum pressure valves, filler valves and proportional valves.

Applications

In the hydraulic pumps sector, Barbieri specializes in the design and manufacture of rubber seals, rubber membranes and anti-seepage gaskets. The mixes are tested in the field and in the laboratory. With fifty years of experience in this sector, we can now achieve excellent seal results even at high pressures, and prevent seepage even without the aid of additional rigid components.

Barbieri’s patented technology allows “flash-free” molding, which delivers a considerable improvement in seal-in rubber components working inside hydraulic pumps.

Constant contact with hydraulic fluid obviously requires the use of NBR-based mixes, but high pressures combined with relatively high temperatures, plus the possibility of friction and the need to maintain a perfect seal, often make it necessary to turn towards much more high-performance compounds, that are designed and tested specifically for the pump in question.

Barbieri Rubber also produces a series of rubber accessories for hydraulic valves and distributors, such as actuator buttons using rubber-metal co-molding technology, valve or solenoid valve guards, connector covers and simple dust guards that snap onto the body of the valve or distributor, obviously all made of oilproof rubber, also resistant to ozone.

Materials

Compounds that are always oilproof, but are also long-lasting and resistant to acidic or alkaline substances are used for particularly heavy-duty applications, or when it is necessary to achieve high levels of reliability. These compounds are used in power stations, on planes, or for aerospace and railway applications, as material for safety devices, safety valves, deviators, maximum pressure valves, filler valves and proportional valves.

Oil-Hydraulics