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BECA 235

BECA 235
beca_235_3d_v1
beca_235_3d_v2

Description

The BECA 235 profile is a U-ring type single acting seal with symmetrical rubber lips. It can be used for both rod and piston applications.

Advantages

Optimised sealing effect
Excellent resistance to high temperatures depending on the type of material chosen
Assembly by deformation in closed groove

Technical data

Temperature

-30°C/+200°C

Pressure

15 MPa

Speed

0.5 m/s

Medias

Mineral hydraulic oils
Fire-resistant liquids
Biocompatible fluids
Water
Others (contact our experts)

Applications

Mobile machinery
Machine tools
Presses
Standard cylinders

Materials

NBR 70 Shore A
NBR 85 Shore A
FKM 85 Shore A

Dimensions
Materials
Technical data

Dimensions

Installation drawingLogement Gorge Joint de tige piston - Housing Groove Gland Rod Piston seal BECA 235

Materials

NBR

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
-40°C / +100°C with our low-temperature NBR

EPDM

As an Ethylene Propylene Diene Monomer copolymer, EPDM is a rubber 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 -50°C/+150°C

FKM

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
-40°C / +200°C with our FKM GLT on request

HNBR

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

ACM

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

VMQ

This VMQ-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

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

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

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

Technical data

Housing Groove Gland Rod/Piston Seal - BECA 235

Extrusion gaps

Pressure
MPa
Radial extrusion gap
F/2
2.5 MPa 0.45
5.0 MPa 0.35
7.5 MPa 0.30
10 MPa 0.25
15 MPa 0.20

Surface roughness

Roughness Dynamic surface area Static surface area Groove flanks
Ra 0.1 - 0.4 µm ≤ 1.6 µm ≤ 3.2 µm
Rz 0.63 - 2.5 µm ≤ 6.3 µm ≤ 10.0 µm
Rmax 1.0 - 4.0 µm ≤ 10.0 µm ≤ 16.0 µm

Chamfers and radius

Radial section
S
Radius
R1
Radius
R2
Chamfer
C
3.50 0.20 0.40 2.00
5.00 0.40 0.60 2.50
7.50 0.80 1.00 4.00
10.00 0.80 1.00 5.00
78 dimensions found
235.1007003
Standard request
3,00 7,00 5,00 6,00
235.0030082
Standard request
3,17 7,92 2,38 2,50
235.0100044
Standard request
4,00 10,00 4,50 5,00
235.0180094
Standard request
9,50 18,50 4,50 5,00
235.1020010
Standard request
10,00 20,00 8,00 9,00
235.0200145
Standard request
14,00 20,00 5,00 6,00
235.0250184
Standard request
18,00 25,00 4,00 4,50
235.0180264
Standard request
18,00 26,00 4,00 5,00
235.0270195
Standard request
19,00 27,00 5,00 6,00
235.0280204
Standard request
20,00 28,00 4,50 5,00
235.0300206
Standard request
20,00 30,00 6,00 7,00
235.0300208
Standard request
20,00 30,00 8,00 9,00
235.0320254
Standard request
25,20 32,60 4,00 5,00
235.0250335
Standard request
25,00 33,00 5,00 6,00
235.0350256
Standard request
25,00 35,00 6,00 7,00
235.1035025
Standard request
25,00 35,00 8,00 9,00
235.1035029
Standard request
28,70 35,00 4,50 5,00
235.0280365
Standard request
28,00 36,00 5,00 6,00
235.1038025
Standard request
25,40 38,10 7,93 8,50
235.0400308
Standard request
30,00 40,00 8,00 9,00
235.1040030
Standard request
30,00 40,00 10,00 11,00
235.0320426
Standard request
32,00 42,00 6,20 6,70
235.0320456
Standard request
32,00 45,00 6,50 7,00
235.1045035
Standard request
35,00 45,00 6,00 6,50
235.28048CA
Standard request
28,00 48,00 12,00 13,00
235.1050038
Standard request
38,00 50,00 6,00 6,50
235.1050040
Standard request
40,00 50,00 5,00 5,50
235.0500406
Standard request
40,00 50,00 6,00 7,00
235.0500409
Standard request
40,00 50,00 9,00 10,00
235.2050040
Standard request
40,00 50,00 10,00 11,00
235.1050045
Standard request
45,00 50,00 5,00 6,00
235.0550428
Standard request
42,00 55,00 8,00 9,00
235.0550456
Standard request
45,00 55,00 6,00 6,50
235.0580462
Standard request
46,00 58,00 12,00 13,00
235.1060048
Standard request
48,00 60,00 6,00 6,50
235.1060050
Standard request
50,00 60,00 10,00 11,00
235.0620442
Standard request
44,00 62,00 12,00 13,00
235.0630451
Standard request
45,00 63,00 11,00 12,00
235.0630452
Standard request
45,00 63,00 12,00 13,00
235.8063050
Standard request
50,00 63,00 8,20 9,00
235.0630535
Standard request
53,00 63,00 5,00 6,00
235.1063053
Standard request
53,00 63,00 12,00 13,00
235.S650451
Standard request
45,00 65,00 10,00 11,00
235.0650501
Standard request
50,00 65,00 10,00 11,00
235.0580686
Standard request
58,80 68,00 5,40 6,20
235.0700557
Standard request
55,00 70,00 7,50 8,50
235.1070055
Standard request
55,00 70,00 12,00 13,00
235.1070060
Standard request
60,00 70,00 12,00 13,00
235.55075CA
Standard request
55,00 75,00 12,00 13,00
235.0750651
Standard request
65,00 75,00 10,00 11,00
235.1075065
Standard request
65,00 75,00 12,00 13,00
235.0780632
Standard request
63,00 78,00 12,00 13,00
235.0800659
Standard request
65,00 80,00 9,00 10,00
235.5070080
Standard request
70,00 80,00 5,00 6,00
235.0800705
Standard request
70,00 80,00 5,50 6,50
235.1080070
Standard request
70,00 80,00 8,00 9,00
235.0750856
Standard request
75,00 85,00 6,00 7,00
235.1085075
Standard request
75,00 85,00 12,00 13,00
235.0760865
Standard request
76,50 86,50 5,00 5,50
235.0620882
Standard request
62,00 88,00 12,00 13,00
235.0880734
Standard request
73,00 88,50 14,60 15,50
235.0900605
Standard request
60,00 90,00 15,00 16,50
235.0700902
Standard request
70,00 90,00 11,00 12,00
235.0900752
Standard request
75,00 90,00 12,00 13,00
235.1090080
Standard request
80,00 90,00 10,00 11,00
235.0660922
Standard request
66,67 92,07 19,00 20,00
235.1100085
Standard request
85,00 100,00 12,00 13,00
235.1000868
Standard request
86,00 100,00 8,00 8,70
235.1000908
Standard request
90,00 100,00 8,00 9,00
235.1000909
Standard request
90,00 100,00 9,00 10,00
235.1100090
Standard request
90,00 100,00 12,00 13,00
235.1100805
Standard request
80,00 110,00 15,00 16,50
235.1150951
Standard request
95,00 115,00 10,00 11,50
235.1201008
Standard request
100,00 120,00 8,00 9,00
235.0951202
Standard request
95,25 120,65 19,00 20,00
235.1301159
Standard request
115,00 130,00 9,50 10,50
235.1451256
Standard request
125,00 145,00 16,00 17,00
235.2001755
Standard request
175,00 200,00 15,70 16,00