BECA 021
Description
The BECA 021 profile is a single acting composite rod seal composed of a profiled rubber seal 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 |
| Speed | 1 m/s |
| Medias | Mineral hydraulic oils |
Applications
Actuators
Brakes systems
Flight controls
Motors
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
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) |
|---|---|
| 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
Groove widths and extrusion gaps
| Series | Groove width | Extrusion gaps F |
|
|---|---|---|---|
| L1 min - max |
L2 min - max |
||
| 010 - 012 | 2.39 - 2.52 | 3.81 - 4.06 | 0.10 |
| 013 - 028 | 0.13 | ||
| 110 - 125 | 3.58 - 3.83 | 4.65 - 4.90 | 0.13 |
| 126 - 131 | 0.15 | ||
| 132 - 149 | 0.18 | ||
| 210 - 222 | 4.78 - 5.03 | 5.97 - 6.22 | 0.13 |
| 223 - 225 | 0.15 | ||
| 226 - 245 | 0.18 | ||
| 246 - 247 | 0.20 | ||
| 325 - 327 | 7.14 - 7.39 | 8.48 - 8.73 | 0.15 |
| 328 - 349 | 0.18 | ||
| 425 - 449 | 9.53 - 9.78 | 12.07 - 12.32 | 0.23 |
| 450 - 460 | 0.25 | ||
Tolerances on the rod diameters and groove diameters
| Series | Tolerance on rod diameter Ød1 |
Tolerance on groove diameter ØD1 |
|---|---|---|
| 010 - 012 | -0.025/0 | 0/+0.025 |
| 013 - 349 | -0.050/0 | 0/+0.050 |
| 425 - 446 | -0.078/0 | 0/+0.076 |
| 447 - 460 | -0.076/0 | 0/+0.100 |
Surface roughness
| Roughness | Dynamic surface area | Static surface area | Groove flanks |
|---|---|---|---|
| Ra | 0.05 - 0.2 µm | ≤ 1.6 µm | ≤ 3.2 µm |
| Rz | 0.4 - 1.6 µm | ≤ 6.3 µm | ≤ 10.0 µm |
| Rmax | 0.63 - 2.5 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 |
|
021.010
|
010 | 6,30 | 9,12 | 9,14 | 2,39 | 3,81 |
|
021.011
|
011 | 7,87 | 10,69 | 10,72 | 2,39 | 3,81 |
|
021.012
|
012 | 9,47 | 12,29 | 12,32 | 2,39 | 3,81 |
|
021.013
|
013 | 11,05 | 13,84 | 13,89 | 2,39 | 3,81 |
|
021.014
|
014 | 12,65 | 15,44 | 15,49 | 2,39 | 3,81 |
|
021.015
|
015 | 14,22 | 17,02 | 17,07 | 2,39 | 3,81 |
|
021.016
|
016 | 15,82 | 18,62 | 18,67 | 2,39 | 3,81 |
|
021.017
|
017 | 17,40 | 20,19 | 20,24 | 2,39 | 3,81 |
|
021.018
|
018 | 19,00 | 21,79 | 21,84 | 2,39 | 3,81 |
|
021.019
|
019 | 20,57 | 23,37 | 23,42 | 2,39 | 3,81 |
|
021.020
|
020 | 22,17 | 24,97 | 25,02 | 2,39 | 3,81 |
|
021.021
|
021 | 23,75 | 26,54 | 26,59 | 2,39 | 3,81 |
|
021.022
|
022 | 25,35 | 28,14 | 28,19 | 2,39 | 3,81 |
|
021.023
|
023 | 26,92 | 29,72 | 29,77 | 2,39 | 3,81 |
|
021.024
|
024 | 28,52 | 31,32 | 31,37 | 2,39 | 3,81 |
|
021.025
|
025 | 30,10 | 32,89 | 32,94 | 2,39 | 3,81 |
|
021.026
|
026 | 31,70 | 34,49 | 34,54 | 2,39 | 3,81 |
|
021.027
|
027 | 33,27 | 36,07 | 36,12 | 2,39 | 3,81 |
|
021.028
|
028 | 34,87 | 37,67 | 37,72 | 2,39 | 3,81 |
|
021.110
|
110 | 9,47 | 13,87 | 14,00 | 3,58 | 4,65 |
|
021.111
|
111 | 11,05 | 15,47 | 15,57 | 3,58 | 4,65 |
|
021.112
|
112 | 12,65 | 17,07 | 17,17 | 3,58 | 4,65 |
|
021.113
|
113 | 14,22 | 18,64 | 18,75 | 3,58 | 4,65 |
|
021.114
|
114 | 15,82 | 20,24 | 20,35 | 3,58 | 4,65 |
|
021.115
|
115 | 17,40 | 21,82 | 21,92 | 3,58 | 4,65 |
|
021.116
|
116 | 19,00 | 23,44 | 23,52 | 3,58 | 4,65 |
|
021.117
|
117 | 20,57 | 25,02 | 25,10 | 3,58 | 4,65 |
|
021.118
|
118 | 22,17 | 26,62 | 26,70 | 3,58 | 4,65 |
|
021.119
|
119 | 23,75 | 28,19 | 28,27 | 3,58 | 4,65 |
|
021.120
|
120 | 25,35 | 29,79 | 29,87 | 3,58 | 4,65 |
|
021.121
|
121 | 26,92 | 31,37 | 31,45 | 3,58 | 4,65 |
|
021.122
|
122 | 28,52 | 32,97 | 33,05 | 3,58 | 4,65 |
|
021.123
|
123 | 30,10 | 34,54 | 34,62 | 3,58 | 4,65 |
|
021.124
|
124 | 31,70 | 36,14 | 36,22 | 3,58 | 4,65 |
|
021.125
|
125 | 33,27 | 37,72 | 37,80 | 3,58 | 4,65 |
|
021.126
|
126 | 34,87 | 39,32 | 39,40 | 3,58 | 4,65 |
|
021.127
|
127 | 36,45 | 40,89 | 40,97 | 3,58 | 4,65 |
|
021.128
|
128 | 38,05 | 42,49 | 42,57 | 3,58 | 4,65 |
|
021.129
|
129 | 39,62 | 44,07 | 44,15 | 3,58 | 4,65 |
|
021.130
|
130 | 41,22 | 45,67 | 45,75 | 3,58 | 4,65 |
|
021.131
|
131 | 42,80 | 47,24 | 47,32 | 3,58 | 4,65 |
|
021.132
|
132 | 44,40 | 48,84 | 48,92 | 3,58 | 4,65 |
|
021.133
|
133 | 45,97 | 50,39 | 50,50 | 3,58 | 4,65 |
|
021.134
|
134 | 47,57 | 51,99 | 52,10 | 3,58 | 4,65 |
|
021.135
|
135 | 49,17 | 53,59 | 53,70 | 3,58 | 4,65 |
|
021.136
|
136 | 50,75 | 55,17 | 55,27 | 3,58 | 4,65 |
|
021.137
|
137 | 52,35 | 56,77 | 56,87 | 3,58 | 4,65 |
|
021.138
|
138 | 53,92 | 58,34 | 58,45 | 3,58 | 4,65 |
|
021.139
|
139 | 55,52 | 59,94 | 60,05 | 3,58 | 4,65 |
|
021.140
|
140 | 57,10 | 61,52 | 61,62 | 3,58 | 4,65 |
|
021.141
|
141 | 58,70 | 63,12 | 63,22 | 3,58 | 4,65 |
|
021.142
|
142 | 60,27 | 64,69 | 64,80 | 3,58 | 4,65 |
|
021.143
|
143 | 61,87 | 66,29 | 66,40 | 3,58 | 4,65 |
|
021.144
|
144 | 63,45 | 67,87 | 67,97 | 3,58 | 4,65 |
|
021.145
|
145 | 65,05 | 69,47 | 69,57 | 3,58 | 4,65 |
|
021.146
|
146 | 66,62 | 71,04 | 71,15 | 3,58 | 4,65 |
|
021.147
|
147 | 68,22 | 72,64 | 72,75 | 3,58 | 4,65 |
|
021.148
|
148 | 69,80 | 74,22 | 74,32 | 3,58 | 4,65 |
|
021.149
|
149 | 71,40 | 75,82 | 75,92 | 3,58 | 4,65 |
|
021.210
|
210 | 19,00 | 25,12 | 25,17 | 4,78 | 5,97 |
|
021.211
|
211 | 20,57 | 26,7 | 26,75 | 4,78 | 5,97 |
|
021.212
|
212 | 22,17 | 28,32 | 28,35 | 4,78 | 5,97 |
|
021.213
|
213 | 23,75 | 29,9 | 29,92 | 4,78 | 5,97 |
|
021.214
|
214 | 25,35 | 31,5 | 31,52 | 4,78 | 5,97 |
|
021.215
|
215 | 26,92 | 33,07 | 33,10 | 4,78 | 5,97 |
|
021.216
|
216 | 28,52 | 34,67 | 34,70 | 4,78 | 5,97 |
|
021.217
|
217 | 30,10 | 36,25 | 36,27 | 4,78 | 5,97 |
|
021.218
|
218 | 31,70 | 37,85 | 37,87 | 4,78 | 5,97 |
|
021.219
|
219 | 33,27 | 39,42 | 39,45 | 4,78 | 5,97 |
|
021.220
|
220 | 34,87 | 41,02 | 41,05 | 4,78 | 5,97 |
|
021.221
|
221 | 36,45 | 42,6 | 42,62 | 4,78 | 5,97 |
|
021.222
|
222 | 38,05 | 44,2 | 44,22 | 4,78 | 5,97 |
|
021.223
|
223 | 41,22 | 47,37 | 47,40 | 4,78 | 5,97 |
|
021.224
|
224 | 44,40 | 50,55 | 50,57 | 4,78 | 5,97 |
|
021.225
|
225 | 47,57 | 53,72 | 53,75 | 4,78 | 5,97 |
|
021.226
|
226 | 50,75 | 56,9 | 56,92 | 4,78 | 5,97 |
|
021.227
|
227 | 53,92 | 60,07 | 60,10 | 4,78 | 5,97 |
|
021.228
|
228 | 57,10 | 63,25 | 63,27 | 4,78 | 5,97 |
|
021.229
|
229 | 60,27 | 66,42 | 66,45 | 4,78 | 5,97 |
|
021.230
|
230 | 63,45 | 69,6 | 69,62 | 4,78 | 5,97 |
|
021.231
|
231 | 66,62 | 72,77 | 72,80 | 4,78 | 5,97 |
|
021.232
|
232 | 69,80 | 75,95 | 75,97 | 4,78 | 5,97 |
|
021.233
|
233 | 72,97 | 79,12 | 79,15 | 4,78 | 5,97 |
|
021.234
|
234 | 76,12 | 82,27 | 82,30 | 4,78 | 5,97 |
|
021.235
|
235 | 79,30 | 85,45 | 85,47 | 4,78 | 5,97 |
|
021.236
|
236 | 82,47 | 88,62 | 88,65 | 4,78 | 5,97 |
|
021.237
|
237 | 85,65 | 91,8 | 91,82 | 4,78 | 5,97 |
|
021.238
|
238 | 88,82 | 94,97 | 95,00 | 4,78 | 5,97 |
|
021.239
|
239 | 92,00 | 98,15 | 98,17 | 4,78 | 5,97 |
|
021.240
|
240 | 95,17 | 101,32 | 101,35 | 4,78 | 5,97 |
|
021.241
|
241 | 98,35 | 104,5 | 104,52 | 4,78 | 5,97 |
|
021.242
|
242 | 101,52 | 107,67 | 107,70 | 4,78 | 5,97 |
|
021.243
|
243 | 104,70 | 110,85 | 110,87 | 4,78 | 5,97 |
|
021.244
|
244 | 107,87 | 114,02 | 114,05 | 4,78 | 5,97 |
|
021.245
|
245 | 111,05 | 117,2 | 117,22 | 4,78 | 5,97 |
|
021.246
|
246 | 114,22 | 120,37 | 120,40 | 4,78 | 5,97 |
|
021.247
|
247 | 117,40 | 123,55 | 123,57 | 4,78 | 5,97 |
|
021.325
|
325 | 38,05 | 47,5 | 47,50 | 7,14 | 8,48 |
|
021.326
|
326 | 41,22 | 50,67 | 50,67 | 7,14 | 8,48 |
|
021.327
|
327 | 44,40 | 53,85 | 53,85 | 7,14 | 8,48 |
