Felt remains a popular material used in certain gasketing applications. Felt is supplied in both wool and synthetic options.
Wool felt is made from pressing premium wool fibers together. This type of product is commonly referred to as “pressed” felt.
The benefits of wool felt include:
- Flame resistance
- Material remains unchanged with continued exposure to many oils
- High strength and excellent wear properties
- Excellent insulator against sound, temperature and vibration
- It does not fray or come apart
In addition to gasketing, wool felt gaskets are also commonly used as wipers and around filter applications.
Wool felt is supplied in various SAE standards ranging from F-1 through F-26. These various factors dictate the wool content, density and other physical properties of the felt.
Felt also comes in a wool blend. This material consists of wool and synthetic fibers. The material is generally a lower grade than pure wool felt and is generally used in packaging applications.
Lastly felt is provided in pure synthetic options. Generally, this material is made from polyester or other synthetic fibers that are pressed together or bonded together using heat. Like wool felt, this material comes in various densities. In addition, manufacturers can add certain coatings to increase flame resistance or add certain properties specific for applications.
Since synthetic felt is made from various man-made materials, manufacturers can substitute different materials at different proportions to achieve certain weight, air flow, etc specific to a desired end product.
Synthetic felt is generally used in the same applications as wool felt, but synthetic felt can withstand higher operating temperatures. Synthetic felt options are typically less expensive than wool.