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Seam Construction
Serged Seam
A serged seam joins two pieces of material with a thread stitch that interlocks. This is an economical stitching method for general applications. This stitching method is generally not used for chemical protective clothing. It is more commonly found on limited use clothing where dry particulates are of a concern.
 
Sewn and Bound Seam
This seam joins two pieces of material with an overlay of similar material and is chain stitched through all of the layers for a clean finished edge. This provides increased holdout of liquids and dry particulates.
 
Heat Sealed Seam
A heat sealed seam is sewn and then sealed with a heat activated tape. This method provides liquid proof seams, and is especially useful for Level A and B chemical protective clothing.
 
Ultra Sonic Welded Seam
Similar to a bound seam, with additional protection due to the fusing, under heat & pressure, of the material at the seam. No thread (or needle holes) required. Applications: heavy-duty chemical protection.