Advanced F-LSR Elastomers for Automotive Applications

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.

Potential cost savings with F-LSR Technology.

Figure 1. Potential cost savings with F-LSR Technology.

Comparison of torque results of FSR and F-LSR elastomers.

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)

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.

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