May 12 2014
Dow Corning offers fully fluorinated F-LSR elastomers capable of improving design flexibility and increasing process efficiency. These pigmentable elastomers are specially designed for liquid injection molding, which can lower processing costs for membranes, diaphragms, O-rings, seals, and components used in emission controls and engine systems.
Key Features and Applications of Silastic F-LSR Elastomers
Silastic® FL 30-9201 F-LSR and Silastic® FL 40-9201 F-LSR.
- Exhibit superior tensile and tear strengths for outstanding performance
- Are stable over a wide temperature range
- Have good resistance to chemicals, solvents, oils and fuels
- Suitable for intricate parts
Silastic® FL 30-9201 F-LSR are used in seals and connectors, while Silastic® FL 40-9201 F-LSR are used in connectors, seals and umbrella valves. Silastic® FL 60-9201 F-LSR and Silastic FL 70-9201 F-LSR have nontacky surface with superior fuel and oil resistance. They are also suitable for fabrication of intricate components. Silastic® FL 60-9201 F-LSR often requires no post-curing and is used in membranes and diaphragms. Silastic FL 70-9201 F-LSR exhibits low compression set when post-cured and is used in the fabrication of O-rings.
Dow Corning’s Advanced F-LSR Elastomers
Dow Corning offers the following F-LSR elastomers for fabricating automotive components that demand resistance to solvents, oils, fuels and chemicals and need to endure extreme heat, cold and adverse operating conditions:
- Silastic® FL 30-9201 F-LSR (30 Shore A durometer)
- Silastic® FL 40-9201 F-LSR (40 Shore A durometer)
- Silastic® FL 60-9201 F-LSR (60 Shore A durometer)
- Silastic® FL 70-9201 F-LSR (70 Shore A durometer)
Silastic® F-LSR Elastomers expand design possibilities by meeting the requirements for overmolding, intricate designs, high precision and small components. They are fast-curing elastomers, thus improving process efficiency with automated processing, increased output, reduced scrap rates through flash-free components and avoidance of secondary deflashing, energy savings and reduced labor costs.
Figure 1 depicts the potential cost savings achieved with F-LSR technology and Figure 2 compares the torque results of FSR and F-LSR elastomers.
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Figure 1. Potential cost savings with F-LSR Technology.
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Figure 2. Comparison of torque results of FSR and F-LSR elastomers.
Typical Properties of Silastic F-LSR Elastomerss
The following table compares the typical properties of the aforementioned Silastic® F-LSR Elastomers:
| Standard* |
Property |
Unit |
Silastic® FL 30-9201 F-LSR |
Silastic® FL 40-9201 F-LSR |
Silastic® FL 60-9201 F-LSR |
Silastic® FL 70-9201 F-LSR |
| CTM 1094 |
Viscosity at 10s-1 |
Pa.s |
430 |
780 |
850 |
1,000 |
| ASTM D792 |
Specific gravity |
|
1.44 |
1.44 |
1.42 |
1.42 |
| |
As Molded1 |
Post- Cured2 |
As Molded1 |
Post- Cured2 |
As Molded1 |
Post- Cured2 |
As Molded1 |
Post- Cured2 |
| ASTM D2240 |
Durometer hardness |
Shore A |
30 |
33 |
40 |
44 |
60 |
62 |
68 |
70 |
| DIN 53504, S2 |
Tensile strength |
MPa |
9.4 |
8.8 |
9.4 |
8.5 |
6.5 |
7.0 |
5.8 |
6.1 |
| DIN 53504, S2 |
Elongation at break |
% |
550 |
510 |
480 |
410 |
220 |
225 |
180 |
180 |
| DIN 53504, S2 |
Modulus 100% |
MPa |
0.56 |
0.67 |
1.14 |
1.23 |
2.58 |
2.80 |
3.32 |
3.54 |
| ASTM D6248B |
Tear strength |
kN/m |
16 |
16 |
16 |
14 |
14 |
15 |
15 |
15 |
| ASTM D395 |
Compression set after 22h at 175°C (347°F), 25% compression3 |
% |
21 |
10 |
17 |
11 |
21 |
11 |
23 |
13 |
| ASTM D471 |
Fluid resistance - 168h volume swell4 |
|
|
|
|
|
| |
Dexron III, 125°C (257°F) |
% |
1 |
1 |
1 |
2 |
| |
IRM 903, 150°C (302°F) |
% |
3 |
2 |
2 |
2 |
| |
Reference Fuel C, 60°C (140°F) |
% |
25 |
23 |
21 |
22 |
| |
Reference FAM B, 60°C (140°F) |
% |
34 |
32 |
29 |
27 |
| |
E85,60°C (140°F) |
% |
12 |
11 |
12 |
11 |
| |
RME Biodiesel, 40°C (104°F) |
% |
4 |
3 |
3 |
3 |
| |
Reference Fuel F, Diesel, 40°C (104°F) |
% |
3 |
3 |
2 |
4 |
| |
MIL-T-83133E, JP-8, 23°C (73°F) |
% |
7 |
5 |
6 |
6 |
*CTM: Corporate Test Method; available upon request
ASTM: American Society for Testing and Materials
DIN: Deutsche Industrie Norm
1Press-cured 10min at 120°C (248°F)
2Post-cured 4h at 200°C (392°F)
3Molded buttons, 22h at 175°C (347°F)
4Injection molded slab, post-cured 4h at 200°C (392°F)
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This information has been sourced, reviewed and adapted from materials provided by Dow Corning Automotive.
For more information on this source, please visit Dow Corning Automotive.