FSIL Parker LM159-70 O-Ring, Size: -018
Material: FSIL Parker LM159-70 O-Ring
Size: AS568 -018 O-Ring
Part Number: LM159-70-OR-018
Parker Seal® (Parker)
LM159-70
Fluorosilicone (FVMQ, FSIL)
70
Shore A
MIL-DTL-25988, AMS-R-25988, MIL-R- 25988 Class 1, Type 1 & 2.
General Purpose Material
Color: Blue
Detailed Description
LM159-70-OR-018 is a Blue, 70 Shore A, Fluorosilicone (FVMQ, FSIL) O-Ring made from Parker Seal® (Parker). Parker Seal® (Parker) LM159-70 is manufactured with the following features & specifications: MIL-DTL-25988, AMS-R-25988, MIL-R- 25988 Class 1, Type 1 & 2., General Purpose Material. LM159-70-OR-018 is AS568 size -018 O-Ring also referred to as 1.78mm (Cross Sectional Diameter (CS)) x 18.77mm (Inside Diameter (ID)).
Material: FSIL Parker LM159-70 O-Ring
Size: AS568 -018, 1.78mm CS X 18.77mm ID (0.070" CS X 0.739" ID)
| Technical Specification | Value |
|---|---|
| Compound Number | LM159-70 |
| Brand | Parker Seal® (Parker) |
| Material | Fluorosilicone (FVMQ, FSIL) |
| Color | Blue |
| Durometer | 70 Shore A |
| High Temperature | 177 °C / 351 °F |
| Low Temperature | -73 °C / -99 °F |
| Geometry Specifications | |
| Cross Sectional Geometry | O-Ring |
| Size Standard | AS568 |
| Size | -018 |
| Cross Section (CS) | 1.78 mm / 0.070 in |
| Inside Diameter (ID) | 18.77 mm / 0.739 in |
| Other Specifications | |
MIL-DTL-25988, AMS-R-25988, MIL-R- 25988 Class 1, Type 1 & 2. | |
Parker’s LM159-70 is a 70 Shore A blue fluorosilicone (FVMQ) compound widely regarded as a benchmark material for low-temperature fuel sealing applications. Designed for reliable performance from -100°F to 350°F (-73°C to 177°C), it maintains elasticity and sealing force in extreme cold while remaining stable at elevated temperatures. The fluorosilicone polymer combines a silicone backbone for low-temperature flexibility with fluorinated side chains that provide excellent resistance to petroleum-based fuels, oils, and greases. This balance makes LM159-70 especially well suited for modern automotive and aerospace fuel systems that experience wide thermal cycling.
LM159-70 is commonly used for O-rings and gaskets in fuel quick disconnects, fuel and air sensors, and systems handling gasoline, E85, diesel, biodiesel, and ULSD. Improvements in rebound resilience compared to earlier fluorosilicone generations support more reliable installation and automated assembly, reducing the risk of seal damage. While fluorosilicones are generally better suited for static or lightly dynamic applications, LM159-70 remains a preferred choice where low-temperature fuel compatibility is the primary requirement. Canyon Components offers equivalent fluorosilicone materials designed to match the low-temperature performance, fuel resistance, and assembly characteristics of Parker LM159-70 for automotive and aerospace sealing applications.
Common relevant keywords:
fluorosilicone FVMQ O-rings, low temperature fuel seals, AMS-R-25988 fluorosilicone, 70 Shore A fluorosilicone rubber, fuel quick disconnect O-rings, gasoline compatible elastomers, E85 fuel seals, diesel and biodiesel O-rings, blue fluorosilicone gaskets, automotive fuel system sealing materials, Parker LM159-70 equivalent, Datasheet, TDS, Test Report, MTR, MSDS, SDS