oil seals lip Materials used

Materials used for the sealing lip
The material used for the sealing lip is a mixture of one or more basic elastomers and a variety of ingredients, such as: reinforcing fillers, plasticizers, antioxidants, accelerators, etc. This is for the purpose of providing it with certain properties, such as:
– Compatibility with the fluid contacted
– High degree of elasticity
– Wear resistance
– Low friction coefficient.
A familiarity with the materials is essential to help the designing specialist make the proper selection of the most suitable materials for the application of interest. oil seals lip Materials used.The main qualities of the compounds ROLF uses for producing its shaft seals are:
NBR – Nitrile rubber
The most widely used elastomer in most current applications. It is particularly recommended in case of contact with:
– Paraffin-based (aliphatic) oils
– Mineral oils and fats (oils for engines, gearboxes, differentials, etc.)
– Hydraulic oils
– Water and aqueous solutions (lyes).
The temperature range varies from -30°C to + 120°C.
ACM – Polyacrylic rubber
This elastomer is recommend for use with:
– engine oils even if containing additives and sulfur
– transmission oils
– hydraulic oils.
The temperature range varies from -25°C to + 150°C.
MVQ – Siliconic rubber
Due to its chemical composition (high molecular weight chains of appropriately modified polysiloxanes), this series is particularly resistant toward atmospheric agents, light and ozone. It also exhibits an excellent high- and low-temperature resistance, so that its field of application covers a broad range. Despite its less than fully satisfactory tear and abrasion strength, its low friction coefficient amply compensates for the relative effect. oil seals lip Materials used.It is recommended for:
– resistance to atmospheric agents, ozone, etc.
– mineral oils
– glycol-based fluids.
Never use with petrols.
The temperature range varies from -55°C to + 180°C.
FPM – Fluorinated rubber
This elastomer has exceptional heat and chemical resistance. Its properties remain indefinitely stable up to about 200°C. It offers excellent performances in contact with:
– aliphatic hydrocarbons
– aromatic hydrocarbons (toluene, benzene, xylene)
– vegetable and mineral oils and fats, even if containing additives
– chlorinated solvents
– ozone
– light and atmospheric agents.
The temperature range is from -30°C to + 200°C.
HNBR – Hydrogenated nitrile rubber
The chemical structure of this elastomer (obtained by hydrogenating an appropriate type of NBR nitrile rubber) allows achieving, especially if vulcanized with a peroxide system, an average heat resistance 30°C above that of nitrile rubber, and an excellent abrasion resistance.oil seals lip Materials used.
Its resistance to oils and solvents is on average slightly superior to that of nitrile rubber, except for special cases. It is therefore recommended for:
– heat resistance
– ozone resistance
– abrasion resistance.
The temperature range is from -40°C to + 150°C.
EPDM – Ethylene-propylene rubber
This rubber is based on ethylene-propylene plus a third (diene) monomer which allows its reticulation with sulphur. Due to its chemical structure, it has a peculiar resistance to fluids such as water and steam and environments such as ozone, which recommends its use for:
– water, up to boiling point
– steam
– particular hydraulic systems, such as braking systems
– ozone
– atmospheric agents
– bases
– polar solvents at ambient temperature.
The temperature range is from -50°C to + 150°C.