Once the construction is determined, the weave pattern is the next consideration. Most fabrics are plain weave, which means each yarn passes over one then under one of the crossing yarns in the simplest possible pattern. Twill weave permits the fabric to be somewhat more conformable without losing a great deal of fabric stability. In a satin weave, each yarn floats over three or more cross yarns and then passes under one. One particular type of 4H-satin is called crowfoot weave.
Satin weaves are the most conformable but are loose and easily distorted during handling.
The following table lists only a few of the hundreds of available fiberglass styles with a complete description of each. Although some fabrics have different warp and fill yarns, none of these do, so the yarn shown is used in both. The same applies to 6581 and 6781. 6533 is very close to 3733, and 6781 is very close to 7781. Finishing formulations are proprietary recipes that enhance bonding with the type of resin to be used.