I am in the process of replacing the felt wipers on an older machine. I sifted through a number of hits on the web regarding this topic and did not find much credible technical information on the subject. Suggestions ranged from getting felt from old boots and hats, to buying the most dense felt you and find.
In looking further, I happened to stumble across this document:
https://www.professionalplastics.com/professionalplastics/TypesofFelt.pdf.
In case this link goes dead at some point, here are the points of interest for way wiper material, and more specifically, the felt grades:
The other place wipers are mentioned is when they write about synthetic blend varieties:
The document goes on about some of the other interesting characteristics of felt. Hope this helps someone else.
GunDraw
In looking further, I happened to stumble across this document:
https://www.professionalplastics.com/professionalplastics/TypesofFelt.pdf.
In case this link goes dead at some point, here are the points of interest for way wiper material, and more specifically, the felt grades:
SAE F-1 Pressed Felt - SAE F-1 is a hard-density white wool felt. It is suitable for oil retention where the felt is not compressed, for feeding low viscosity or light oil, and where unusual strength and hardness are required. Typical uses include washers, bushings wicks, door bumpers, polishing blocks, and parts where wear resistance to abrasion are required
SAE F-3 Pressed felt - SAE F-3 is a grey high-grade felt of slightly less density and durability than SAE F-1, but still recommended for precision uses such as: vibration mounts; precision lubrication wicking; oil seals; bumpers; gaskets; automobile, aircraft, and machinery components.
SAE F-5 Pressed Felt - SAE F-5 is a white high-grade felt of medium density recommended for precision uses where resiliency and durability are important factors. Typical uses include: lubrication wicks, grease seals, wipers, shock dampers, and dust seals
The other place wipers are mentioned is when they write about synthetic blend varieties:
Plushes - Pile fabrics are a combination of natural & synthetic fibers. A wide variety of pile types, height, and configurations is available. Typical Applications: Gaskets, wipers, light seals, roll covers, lint brushes, directional belts, litho plate cleaners, etc.
The document goes on about some of the other interesting characteristics of felt. Hope this helps someone else.
GunDraw