BECA 024

BECA 024
beca_024_3d_v1
beca_024_3d_v2

Description

The BECA 024 profile is a double acting composite piston seal composed of a profiled rubber ring and a filled PTFE or POM back-up ring. It meets the standards MIL-G-5514F and AS4716.

Advantages

Excellent extrusion resistance
Good sealing effect in static applications
Wide temperature range and excellent chemical resistance, depending on the materials selected
Housing in line with MIL-G-5514F and AS4716

Technical data

Temperature

-40°C/+200°C

Pressure

35 MPa in static applications
21 MPa in dynamic applications

Speed

1 m/s

Medias

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

Applications

Actuators
Brakes systems
Flight controls
Engine systems
Landing gear

Materials

Profiled seal

NBR 70 Shore A
FKM 70 Shore A
EPDM 70 Shore A
VMQ 70 Shore A

Back-up ring

Polyoxymethylene - POM
Filled PTFE

Dimensions
Materials
Technical data

Dimensions

Installation drawingLogement Gorge Joint de piston aéronautique - Housing Groove Gland aerospace piston seal BECA 024

Materials

Profiled seal

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
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
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)
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
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)
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

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

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

Back-up ring

Polyoxymethylene - POM

Polyoxymethylene (POM or polyacetal) belongs to the thermoplastics, which have a number of advantages - strong mechanical resistance, good creep strength, high resistance to shocks, particularly at low temperatures, good wear resistance, good sliding coefficient, excellent machinability and good dielectric properties. The low water absorption coefficient, unlike polyamide (PA), also gives this material an excellent dimensional stability.

Chemical resistance

Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel)
Mineral oils and greases
Fire-resistant fluids (HFA, HFB and HFC)
Water

Compatibility issue Acids
Temperature range -50°C/+115°C
Filled PTFE

PTFE is a thermoplastic polymer made of tetrafluoroethylene with exceptional properties - very low friction coefficient (adhesive friction and sliding friction are almost equal), physiologically safe for temperatures up to +260°C, excellent electrical insulation properties, and excellent chemical compatibility with the majority of fluids. On the other hand, as this material is plastic and not elastic, so it cannot easily replace rubber bases.

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.

Technical data

Housing Groove Gland Aerospace Piston Seal - BECA 024

Groove widths and extrusion gaps

Series Groove width Extrusion gaps
F
L1 min - max L2 min - max L3 min - max
010 - 012 2.39 - 2.52 3.81 - 4.06 5.26 - 5.51 0.10
013 - 028 0.13
110 - 128 3.58 - 3.83 4.65 - 4.90 6.22 - 6.47 0.13
129 - 140 0.15
141 - 149 0.18
210 - 223 4.78 - 5.03 5.97 - 6.22 7.72 - 7.97 0.13
224 - 227 0.15
228 - 243 0.18
244 - 247 0.20
325 - 329 7.14 - 7.39 8.48 - 8.73 10.77 - 11.02 0.15
330 - 345 0.18
346 - 349 0.20
425 - 445 9.53 - 9.78 12.07 - 12.32 14.71 - 14.96 0.23
446 0.25
447 - 460 0.28

Tolerances on the bore diameters and groove diameters

Series Tolerance on
bore diameter
ØD1
Tolerance on
groove diameter
Ød1
010 - 012 0/+0.025 -0.025/0
013 - 349 0/+0.050 -0.050/0
425 - 446 0/+0.076 -0.050/0
447 - 460 0/+0.100 -0.076/0

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

Series Radius Chamfer
R1 min - max R2 min - max C
010 - 028 0.13 - 0.26 0.13 - 0.38 2.00
110 - 149 0.13 - 0.26 0.13 - 0.38 2.50
210 - 222 0.13 - 0.26 0.13 - 0.38 3.00
223 - 247 0.13 - 0.26 0.25 - 0.64 3.50
325 - 349 0.13 - 0.26 0.51 - 0.89 4.00
425 - 460 0.13 - 0.26 0.51 - 0.89 4.50
158 dimensions found
024.010
Standard request
010 9,14 6,35 6,30 2,39 3,78 5,26
024.011
Standard request
011 10,72 7,92 7,87 2,39 3,78 5,26
024.012
Standard request
012 12,32 9,53 9,47 2,39 3,78 5,26
024.013
Standard request
013 13,97 11,20 11,13 2,39 3,78 5,26
024.014
Standard request
014 15,57 12,80 12,73 2,39 3,78 5,26
024.015
Standard request
015 17,15 14,38 14,30 2,39 3,78 5,26
024.016
Standard request
016 18,75 15,98 15,90 2,39 3,78 5,26
024.017
Standard request
017 20,32 17,55 17,48 2,39 3,78 5,26
024.018
Standard request
018 21,92 19,13 19,08 2,39 3,78 5,26
024.019
Standard request
019 23,50 20,70 20,65 2,39 3,78 5,26
024.020
Standard request
020 25,17 22,38 22,33 2,39 3,78 5,26
024.021
Standard request
021 26,75 23,95 23,90 2,39 3,78 5,26
024.022
Standard request
022 28,35 25,55 25,50 2,39 3,78 5,26
024.023
Standard request
023 29,92 27,13 27,08 2,39 3,78 5,26
024.024
Standard request
024 31,52 28,73 28,68 2,39 3,78 5,26
024.025
Standard request
025 33,10 30,30 30,25 2,39 3,78 5,26
024.026
Standard request
026 34,70 31,90 31,85 2,39 3,78 5,26
024.027
Standard request
027 36,27 33,48 33,43 2,39 3,78 5,26
024.028
Standard request
028 37,87 35,08 35,03 2,39 3,78 5,26
024.110
Standard request
110 13,97 9,63 9,45 3,58 4,65 6,22
024.111
Standard request
111 15,57 11,20 11,05 3,58 4,65 6,22
024.112
Standard request
112 17,15 12,75 12,62 3,58 4,65 6,22
024.113
Standard request
113 18,75 14,35 14,22 3,58 4,65 6,22
024.114
Standard request
114 20,32 15,93 15,80 3,58 4,65 6,22
024.115
Standard request
115 21,92 17,50 17,40 3,58 4,65 6,22
024.116
Standard request
116 23,50 19,06 18,97 3,58 4,65 6,22
024.117
Standard request
117 25,17 20,75 20,65 3,58 4,65 6,22
024.118
Standard request
118 26,75 22,33 22,23 3,58 4,65 6,22
024.119
Standard request
119 28,35 23,93 22,83 3,58 4,65 6,22
024.120
Standard request
120 29,92 25,48 25,40 3,58 4,65 6,22
024.121
Standard request
121 31,52 27,08 27,00 3,58 4,65 6,22
024.122
Standard request
122 33,10 28,65 28,58 3,58 4,65 6,22
024.123
Standard request
123 34,70 30,25 30,18 3,58 4,65 6,22
024.124
Standard request
124 36,27 31,83 31,75 3,58 4,65 6,22
024.125
Standard request
125 37,87 33,43 33,35 3,58 4,65 6,22
024.126
Standard request
126 39,45 35,00 34,93 3,58 4,65 6,22
024.127
Standard request
127 41,05 36,60 36,53 3,58 4,65 6,22
024.128
Standard request
128 42,62 38,18 38,10 3,58 4,65 6,22
024.129
Standard request
129 44,22 39,78 39,70 3,58 4,65 6,22
024.130
Standard request
130 45,85 41,43 41,33 3,58 4,65 6,22
024.131
Standard request
131 47,42 43,00 42,90 3,58 4,65 6,22
024.132
Standard request
132 49,02 44,60 44,50 3,58 4,65 6,22
024.133
Standard request
133 50,60 46,18 46,08 3,58 4,65 6,22
024.134
Standard request
134 52,20 47,78 47,68 3,58 4,65 6,22
024.135
Standard request
135 53,80 49,38 49,28 3,58 4,65 6,22
024.136
Standard request
136 55,37 50,95 50,85 3,58 4,65 6,22
024.137
Standard request
137 56,97 52,55 52,45 3,58 4,65 6,22
024.138
Standard request
138 58,55 54,13 54,03 3,58 4,65 6,22
024.139
Standard request
139 60,15 55,73 55,63 3,58 4,65 6,22
024.140
Standard request
140 61,72 57,30 57,20 3,58 4,65 6,22
024.141
Standard request
141 63,32 58,90 58,80 3,58 4,65 6,22
024.142
Standard request
142 64,90 60,48 60,38 3,58 4,65 6,22
024.143
Standard request
143 66,50 62,08 61,98 3,58 4,65 6,22
024.144
Standard request
144 68,07 63,65 63,55 3,58 4,65 6,22
024.145
Standard request
145 69,67 65,25 63,15 3,58 4,65 6,22
024.146
Standard request
146 71,25 66,83 66,73 3,58 4,65 6,22
024.147
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147 72,85 68,43 68,33 3,58 4,65 6,22
024.148
Standard request
148 74,42 70,00 69,90 3,58 4,65 6,22
024.149
Standard request
149 76,02 71,60 71,50 3,58 4,65 6,22
024.210
Standard request
210 25,17 19,05 19,00 4,78 5,97 7,72
024.211
Standard request
211 26,75 20,62 20,57 4,78 5,97 7,72
024.212
Standard request
212 28,35 22,20 22,17 4,78 5,97 7,72
024.213
Standard request
213 29,92 23,77 23,75 4,78 5,97 7,72
024.214
Standard request
214 31,52 25,37 25,35 4,78 5,97 7,72
024.215
Standard request
215 33,10 27,03 26,92 4,78 5,97 7,72
024.216
Standard request
216 34,70 25,55 28,52 4,78 5,97 7,72
024.217
Standard request
217 36,27 30,12 30,10 4,78 5,97 7,72
024.218
Standard request
218 37,87 31,72 31,70 4,78 5,97 7,72
024.219
Standard request
219 39,45 33,30 33,27 4,78 5,97 7,72
024.220
Standard request
220 41,05 34,90 34,87 4,78 5,97 7,72
024.221
Standard request
221 42,62 36,47 36,45 4,78 5,97 7,72
024.222
Standard request
222 44,22 38,07 38,05 4,78 5,97 7,72
024.223
Standard request
223 47,42 41,28 41,25 4,78 5,97 7,72
024.224
Standard request
224 50,60 44,45 44,42 4,78 5,97 7,72
024.225
Standard request
225 53,80 47,65 47,63 4,78 5,97 7,72
024.226
Standard request
226 56,97 50,83 50,80 4,78 5,97 7,72
024.227
Standard request
227 60,15 54,00 53,98 4,78 5,97 7,72
024.228
Standard request
228 63,32 57,18 57,15 4,78 5,97 7,72
024.229
Standard request
229 66,50 60,35 60,33 4,78 5,97 7,72
024.230
Standard request
230 69,67 63,53 63,50 4,78 5,97 7,72
024.231
Standard request
231 72,85 66,70 66,68 4,78 5,97 7,72
024.232
Standard request
232 76,02 69,88 69,85 4,78 5,97 7,72
024.233
Standard request
233 79,20 73,05 73,03 4,78 5,97 7,72
024.234
Standard request
234 82,37 76,23 76,20 4,78 5,97 7,72
024.235
Standard request
235 85,55 79,40 79,38 4,78 5,97 7,72
024.236
Standard request
236 88,72 82,58 82,55 4,78 5,97 7,72
024.237
Standard request
237 91,90 85,75 85,73 4,78 5,97 7,72
024.238
Standard request
238 95,07 88,93 88,93 4,78 5,97 7,72
024.239
Standard request
239 98,25 92,10 92,10 4,78 5,97 7,72
024.240
Standard request
240 101,42 95,28 95,28 4,78 5,97 7,72
024.241
Standard request
241 104,60 98,45 98,45 4,78 5,97 7,72
024.242
Standard request
242 107,77 101,63 101,63 4,78 5,97 7,72
024.243
Standard request
243 110,95 104,80 104,80 4,78 5,97 7,72
024.244
Standard request
244 114,12 107,98 107,98 4,78 5,97 7,72
024.245
Standard request
245 117,30 111,15 111,15 4,78 5,97 7,72
024.246
Standard request
246 120,47 114,33 114,33 4,78 5,97 7,72
024.247
Standard request
247 123,65 117,50 117,50 4,78 5,97 7,72
024.325
Standard request
325 47,42 37,97 37,97 7,14 8,48 10,77
024.326
Standard request
326 50,60 41,15 41,15 7,14 8,48 10,77
024.327
Standard request
327 53,80 44,35 44,35 7,14 8,48 10,77
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