Search Results
O-Ring, Preformed, Straight Thread Tube Fitting Boss, Type I Hydraulic (-65 to 160 °F)
Rubber: Acrylonitrile-Butadiene (NBR) Fuel-Resistant 60 - 70 Type A Hardness
Elastomer: Chloroprene Rubber (CR) Weather Resistant 55 - 65
Elastomer: Chloroprene Rubber (CR) Weather Resistant 35 - 45
Packaging and Identification of Molded Elastomeric Seals and Sealing Components
Elastomer: Rubber, Silicone (MQ/VMQ/PVMQ) Flame Retardant, Low Smoke Density, Low Smoke Toxicity 50 – 60 Durometer Type A Hardness for Products in Pressurized Aircraft Compartment Interiors
Elastomer: Silicone Rubber (MQ/VMQ), Fiberglass Fabric Reinforced 65 to 75 Shore A Hardness
Elastomer: Nitrile Rubber (NBR) Synthetic Oil Resistant Compression Seals, 65 to 75 Type A Hardness for Products in Engine Oil Systems
Rubber: Fluorocarbon Elastomer (FKM) Aircraft Engine Oil, Fuel and Hydraulic Fluid Resistant 70 to 80 Shore Type A Hardness Low Temperature Sealing Tg -47 °F (-43.9 °C) for Elastomeric Seals in Aircraft Engine, Fuel and Hydraulic Systems
Designing with Elastomers for use at Low Temperatures, Near or Below Glass Transition
To ensure success in design of elastomeric parts for use at low temperature, the design engineer must understand the peculiar properties of rubber materials at these temperatures.
There are no static applications of rubber. The Gaussian theory of rubber elasticity demonstrates that the elastic characteristic of rubber is due to approximately 15% internal energy and the balance, 85%, is entropy change. In other words, when an elastomer is deformed, the elastomer chain network is forced to rearrange its configuration thereby storing energy through entropy change. Thermodynamically, this means that rubber elasticity is time and temperature dependent (Reference 25).
The purpose of this report is to provide guidance on low temperature properties of rubber with the terminology, test methods, and mathematical models applicable to rubber, and to present some practical experience.