Wet Laid Nonwovens

From INDA's Nonwoven Glossary:

Wet laid definition
To distinguish nonwovens from papers, a wet laid material will be defined a nonwoven if:
More than 50%, by mass, of its fibrous content is made up of fibers (excluding chemically digested vegetable fibers) with a length to diameter ratio greater than 300:
or
More than 30%, by mass of its fibrous content is made of fibers in “a” above and meet one
or both of the following criteria:
Length to diameter ratio of more than 600.
The density of the fabric is less than 0.4 g/cc.

Wet laying or Wet forming
Wet laid nonwovens are produced in a process similar to paper making. The nonwoven web is produced by filtering an aqueous suspension of fiber onto a screen conveyor belt or perforated drum. Many wet laid nonwovens are made with wood pulp or other natural fibers blended with synthetic fibers or fiberglass.

Wet laid nonwoven
A wet laid web bonded by one or more techniques to provide fabric integrity.

Wet laid web
A web of fibers produced by the wet laying process.