DC4

DC4

Description

The DC4 profile is a shaft seal composed of a single metal cage with a rubber coating and a double sealing lip suitable for linear movements, the fluids being separated by the integrated springs.

Advantages

Very good static sealing
Very good thermal expansion compensation
Greater roughness is allowed in the housing
Reduced risk of corrosion
Sealing for low and high viscosity fluids
Modern sealing lips with low radial forces
Sealing lips designed for linear movements
Fluid separation system

Technical data

Applications

All types of linear applications
Shock absorbers
Power-assisted steering

Materials

Rubber

FKM 75 - 80 Shore A
HNBR 75 - 80 Shore A
NBR 75 - 80 Shore A

Metal cage

Steel - AISI 1010
Steel - DC01 C490
Steel - DC01 C590

Spring

Steel - AISI 1070 - 1090
Stainless steel - AISI 316

Dimensions
Materials
Conditions
for use

Dimensions

Installation drawingLogement pour bague d'étanchéité - Housing Groove for shaft seal

Materials

Metal cage - Spring

The table below shows the materials that we can offer for metal cages and springs.

Application Material Standard Characteristics
Metal cage Non-alloy standard steel AISI 1010
(DIN 1624)
Cold rolled steel
Metal cage Nickel chrome steel AISI 304
(DIN 1.4301 - V2A)
Standard stainless steel
Metal cage and spring Chrome-nickel-molybdenum steel AISI 316
(DIN 1.4401 - V4A)
Stainless steel highly resistant to corrosion
Spring Steel for springs AISI 1070 - 1090
DIN 17223
Cold drawn carbon steel wire
Spring Nickel chrome steel AISI 302
(DIN 1.4300)
Stainless steel for springs with a high carbon content

Rubbers

ACM (Polyacrylate)

Polymers containing ethyl acrylate (or butyl acrylate) have a small amount of monomer, which is necessary for cross-linking; ACM is a material with better heat resistance than NBR. It is often used for automatic gearboxes.

Chemical resistance Mineral oils (motor oils, gear box oils, ATF oils)
Atmospheric and ozone agents
Compatibility issue Glycol-based brake fluids (Dot 3 & 4)
Aromatic and chlorinated hydrocarbons
Water and steam
Acids, alkalis and amines
Temperature range -25°C to + 150°C (short-term peak at +160°C)
-35°C / +150°C with particular ACMs
AEM (ethylene acrylate rubber)

As a methyl acrylate and ethylene copolymer, AEM is considered to be more resistant to heat than ACM. Its characteristics make it an intermediary between ACM and FKM.

Chemical resistance Cooling fluids
Aggressive mineral oils
Atmospheric agents
Water
Compatibility issue Aromatic solvents
Strong acids
Brake fluids
Gearbox oils
ATF oils
Temperature range - 40°C to + 150°C
CR (Polychloroprene)

This CR-based rubber is used in the refrigeration industry and for ventilation systems. This chloroprene was the first synthetic rubber to be developed and marketed.

Chemical resistance Paraffinic mineral oils
Silicone oils and greases
Water and water-based solvents for use at low temperatures
Refrigerant fluids
Ammoniac
Carbon dioxide
Atmospheric and ozone agents
Limited chemical resistance Naphthenic mineral oils
Aliphatic hydrocarbons (propane, butane, petroleum)
Glycol-based brake fluids
Compatibility issue Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichlorethylene)
Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
Temperature range -40°C / +100°C (short-term peak at +120°C)
EPDM (Ethylene Propylene Diene Monomer rubber)

As an Ethylene Propylene Diene Monomer copolymer, EPDM is commonly used for hot water taps, cooling systems, brake systems, dishwashers and washing machines.

Chemical resistance Hot water and steam up to +150°C
Glycol-based brake fluids (Dot 3 & 4) and silicone-based brake fluids (Dot 5)
Organic and inorganic acids
Cleaning agents, sodium and potassium alkalis
Hydraulic fluids (HFD-R)
Silicone oils and greases
Polar solvents (alcohols, ketones and esters)
Atmospheric and ozone agents
Compatibility issue Mineral oils and greases
Hydrocarbons
Low impermeability to gas
Temperature range -45°C / +150°C (short-term peak at +175°C)
FFKM (perfluorinated rubber)

FFKM has the best characteristics for resistance to high temperatures, with an excellent chemical inertia. This FKM-based rubber is very often used for high-temperature hydraulic and pneumatic systems, industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistance Aliphatic and aromatic hydrocarbons
Polar solvents (ketones, esters and ethers)
Organic and inorganic acids
Water and steam
High-vacuum system
Compatibility issue Coolants (R11, R12, R13, R113, R114, etc.)
PFPE
Temperature range -15°C/+320°C
FKM (fluorinated rubber)

Depending on their structure and fluorine content, the chemical resistance and resistance to the cold in fluororubbers can vary. This FKM-based rubber is very often used for high-temperature hydraulics and pneumatics, for industrial valves, injection/fuel systems, motor seals and high-vacuum systems.

Chemical resistance Mineral oils and greases, ASTM n°1, IRM 902 and IRM 903 oils.
Fire-resistant liquids (HFD)
Silicone oils and greases
Mineral and vegetable oils and greases
Aliphatic hydrocarbons (propane, butane, petroleum)
Aromatic hydrocarbons (benzene, toluene)
Chlorinated hydrocarbons (trichlorethylene)
Fuel (including high alcohol content)
Atmospheric and ozone agents
Compatibility issue Glycol-based brake fluids
Ammonia gas
Organic acids with a low molecular weight (formic and acetic acids)
Temperature range -20°C / +200°C (short-term peak at +230°C)
-40°C / +200°C with particular FKMs
FVMQ (fluorosilicone rubber)

The FVMQ has mechanical and physical properties that are very similar to those of the VMQ. However, the FVMQ offers better resistance to fuels and mineral oils. However, resistance to hot air is not as good as that of the VMQ.

Chemical resistance Aromatic mineral oils (IRM 903 oil)
Fuels
Aromatic hydrocarbons with low molecular weights
(benzene, toluene)
Temperature range -70°C/+175°C
HNBR (Hydrogenated Nitrile Butadiene Rubber)

This HNBR-based rubber is obtained through selective hydrogenation of the NBR's butadiene groups. It is commonly used for power-assisted steering and for air conditioning.

Chemical resistance Aliphatic hydrocarbons
Mineral and vegetable oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Diluted acids, saline solutions and bases for operation at an average temperature
Water and steam up to +150°C
Atmospheric and ozone agents
Compatibility issue Chlorinated hydrocarbons
Polar solvents (ketones, esters and ethers)
Strong acids
Temperature range -30°C / +150°C (short-term peak at +160°C)
-40°C / +150°C with particular HNBRs
NBR (Nitrile Butadiene Rubber)

Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.

Chemical resistance Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel)
Mineral oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Diluted acids, low-temperature alkaline and saline solutions
Water (up to +100°C max)
Compatibility issue Fuels with high aromatic content
Aromatic hydrocarbons (benzene)
Chlorinated hydrocarbons (trichlorethylene)
Polar solvents (ketone, acetone, acetic acid, ethylene-ester)
Strong acids
Glycol-based brake fluids
Atmospheric and ozone agents
Temperature range -30°C / +100°C (short-term peak at +120°C)
-40°C / +100°C with particular NBRs
VMQ (silicone rubber: methyl vinyl polysiloxane)

This FVMQ-based rubber is very often used in fuel systems.

Chemical resistance Animal and vegetable oils and greases
Water for operation at an average temperature
Diluted saline solutions
Atmospheric and ozone agents
Compatibility issue Superheated steam up to +120°C
Chlorinated hydrocarbons with a low molecular weight (trichlorethylene)
Aromatic hydrocarbons (benzene, toluene)
Temperature range -60°C / +200°C (short-term peak at +230°C)

The table below gives an overview of the physical, chemical and mechanical characteristics for each of the materials.

Characteristics/Materials ACM AEM CR EPDM FFKM FKM FVMQ HNBR NBR VMQ
Abrasion resistant 2 3 2 2 4 2 4 2 2 4
Resistance to acids 4 3 2 2 1 1 3 1 3 3
Chemical resistance 4 2 2 1 1 1 1 2 2 2
Resistance to cold 4 2 2 2 3 4 2 2 2 2
Dynamic properties 3 3 3 2 3 2 4 1 2 4
Electrical properties 3 3 3 2 1 4 1 3 3 1
Flame resistant 4 4 2 4 1 1 2 4 4 3
Heat resistant 1 1 2 2 1 1 1 1 2 1
Sealing water 1 1 2 2 2 2 4 2 2 4
Oil resistant 1 3 2 4 1 1 2 1 1 2
Ozone resistant 1 1 2 1 1 1 1 2 4 1
Tearing resistant 2 3 3 1 4 3 4 2 2 4
Traction resistant 3 2 2 1 2 1 3 1 2 4
Water/vapour resistant 4 4 3 1 2 3 3 1 2 3
Resistance to atmospheric agents 1 1 1 1 1 1 1 2 3 1

1. Excellent properties 2. Good properties 3. Average properties 4. Poor properties

Chemical compatibility

A "Chemical compatibility guide" catalogue can be downloaded from the Documentation section. You can also use our online "Chemical compatibility" tool free of charge.

These two tools give you the option of measuring the behaviour of our materials that come into contact with the majority of existing fluids. The data displayed is the result of rigorous testing of the ambient temperature and in consultation with previous publications. Test results are not fully representative due to the specific features of your application. The tests performed actually do not consider additives and impurities that may exist under the actual conditions of use, nor the potential elevation of temperatures. Other parameters can also alter the behaviour of our materials, such as the hardness, persistence, abrasion, etc. We therefore recommend performing your own tests to verify the compatibility of our materials according to your specific application. Our technical team can provide you with any additional information.

Conditions for use

Speed - Pressure

We recommend using seals designed for linear movements at maximum speed of 1.5 m/s and pressures that do not exceed 0.65 MPa. These approximate values cannot be interpreted at the same time.

The table below sets out the connection between the permissible speeds and pressures. For more stringent applications, we recommend contacting our experts.

Speed VS Pressure for shaft seals for linear motion

Temperature

The table below indicates the temperature limits, depending on the materials and fluids used.

Media Maximum temperature, depending on the materials
ACM AEM EPDM FKM HNBR NBR
Mineral oils Oils for motors +130°C +130°C - +170°C +130°C +100°C
Oils for gearboxes +120°C +130°C - +150°C +110°C +80°C
Oils for hypoid gears +120°C +130°C - +150°C +110°C +80°C
ATF oils +120°C +130°C - +170°C +130°C +100°C
Hydraulic oils +120°C +130°C   +150°C +130°C +90°C
Greases - +130°C - - +100°C +90°C
Fire-resistant
fluids
HFA group - Emulsion with more than 80% water - - - - +70°C +70°C
HFB group - Opposite solution (water in oil) - - - - +70°C +70°C
HFC group - Polymer aqueous solution - - +60°C - +70°C +70°C
HFD group - Water-free synthetic fluids - - - +150°C - -
Other fluids EL + L heating oil - - - - +100°C +90°C
Air +150°C +150°C +150°C +200°C +130°C +90°C
Water - - +150°C +100°C +100°C +90°C
Water for washing - - +130°C +100°C +100°C +100°C
Temperature range Min. -25°C -40°C -45°C -20°C -30°C -30°C
Max. +150°C +150°C +150°C +200°C +150°C +100°C

The lip of the seal for linear movement is subjected to a higher temperature due to the movement of the rod, and the significant pressure and friction on the mechanical parts. Good lubrication is therefore necessary to allow for a better release of heat and thus limits the temperature rise in the parts subjected to friction.

Fluids

Mineral oils

In general, this type of oil has few additives and is therefore perfectly suitable for all of the rubbers used for the rotary shaft seals. The following oils are suitable for revolving applications:

  • motor oils
  • gearbox oils
  • hypoid oils
  • ATF oils for automatic gearboxes
  • transmission oils
synthetic oils

This type of oil is used to improve different characteristics such as the resistance to ageing, resistance to high temperatures, viscosity, etc. and has a good compatibility with the majority of rubbers used for the seals for the rotary shaft. Tests may need to be performed beforehand to measure the degree of compatibility of this type of oil with the materials used. Among the synthetic oils are:

  • brake fluids
  • fluids for automatic gearboxes
  • fluids for suspensions
  • fluids for steering systems
  • fluids for hydraulic transmissions
Hypoid oils

This type of oil contains special components such as EP additives. These enable lubrication and thus limit any seizing at the bearings, for example. When affected by heat, these additives have the tendency to lead to deposits on the sealing lip. That is why we recommend using seals for the rotating shaft with a sealing lip comprising return pumping leads in order to limit the increase in temperature and above all, to reduce these potential carbon deposits.

Aggressive fluids

It is critical to choose the correct material to better resist different aggressive fluids (acids, solvents, chemical products, etc.). For applications in a linear environment, we recommend using materials such as FKM rather than NBR. For operations that are dry or use very little lubrication, and where the rubbers do not resist certain aggressive fluids, we advise you to use our PTFE seals for the rotary shaft.

40 dimensions found
DC4 20x30x10
Standard request
20,00 30,00 10,00
DC4 22x36x10
Standard request
22,00 36,00 10,00
DC4 26x37x10,5
Standard request
26,00 37,00 10,50
DC4 27x37x10,5
Standard request
27,00 37,00 10,50
DC4 27x39x10,5
Standard request
27,00 39,00 10,50
DC4 27x40x10,5
Standard request
27,00 40,00 10,50
DC4 28x40x11
Standard request
28,00 40,00 11,00
DC4 30x41x10
Standard request
30,00 41,00 10,00
DC4 30x42x11
Standard request
30,00 42,00 11,00
DC4 31x43x10,3
Standard request
31,00 43,00 10,30
DC4 32x43x10,5
Standard request
32,00 43,00 10,50
DC4 32x44x10,5
Standard request
32,00 44,00 10,50
DC4 32x46x11
Standard request
32,00 46,00 11,00
DC4 33x45x11
Standard request
33,00 45,00 11,00
DC4 33x46x10,5
Standard request
33,00 46,00 10,50
DC4 33x46x11
Standard request
33,00 46,00 11,00
DC4 35x46x11
Standard request
35,00 46,00 11,00
DC4 35x47x10
Standard request
35,00 47,00 10,00
DC4 35x48x11
Standard request
35,00 48,00 11,00
DC4 36x50x11
Standard request
36,00 50,00 11,00
DC4 37x50x11
Standard request
37,00 50,00 11,00
DC4 38x50x8
Standard request
38,00 50,00 8,00
DC4 38x50x10,5
Standard request
38,00 50,00 10,50
DC4 39x52x11
Standard request
39,00 52,00 11,00
DC4 40x52x10,5
Standard request
40,00 52,00 10,50
DC4 41x53x8
Standard request
41,00 53,00 8,00
DC4 41x54x11
Standard request
41,00 54,00 11,00
DC4 42x55x11
Standard request
42,00 55,00 11,00
DC4 43x54x11
Standard request
43,00 54,00 11,00
DC4 43x55x9,5
Standard request
43,00 55,00 9,50
DC4 43x55x10,5
Standard request
43,00 55,00 10,50
DC4 45x57x11
Standard request
45,00 57,00 11,00
DC4 45x58x11
Standard request
45,00 58,00 11,00
DC4 46x58x9,5
Standard request
46,00 58,00 9,50
DC4 46x58x10,5
Standard request
46,00 58,00 10,50
DC4 47x58x10
Standard request
47,00 58,00 10,00
DC4 48x58x8,5
Standard request
48,00 58,00 8,50
DC4 48x58x9,5
Standard request
48,00 58,00 9,50
DC4 50x60x7
Standard request
50,00 60,00 7,00
DC4 50x63x11
Standard request
50,00 63,00 11,00