Serged seam

Two pieces of material are joined with a thread stitch that interlocks economically.

Applications:

Basic protection for most general-purpose applications.

Sewn and bound seam

Two pieces of material joined with an overlay of similar material and chain stitched through all of the layers for increased strength plus holdout of liquids and dry particulates.

Applications:
Hazardous particle protection and light splash situations.

Ultrasonic welded seam

Similar to a bound seam, with additional protection due to the fusion, under heat & pressure, of the material at the seam. No thread (or needle holes) required.
Applications:

Heavy-duty chemical and particle protection.

Taped seam

Two pieces of the same fabric are sewn together. The seam is then overlaid with a barrier tape that is applied under heat and pressure to form a liquid seal.

Applications:
Heavy-duty chemical splash protection and particle protection.