WESTERN STATES #10 Poly Window Envelopes Bright White Box of 500

#10 Poly Window Envelopes

These #10 business envelopes measure 4-1/8 by 9-1/2 inches and feature a bright white vellum finish with 96% brightness. The poly window sits in the standard A-style position at 1-1/8 by 4-3/4 inches, placed three-quarters from the left and one-half from the bottom. Acid-free construction and diagonal seams support long-term document storage. A remoistening seal with the flap down closes each envelope securely.

Upgrade from standard window envelopes

The poly window material resists tearing and moisture better than traditional glassine, keeping addresses legible through handling. Bright white 96% brightness stock improves scan readability and presents a cleaner professional appearance than lower-brightness alternatives. Acid-free paper prevents yellowing and document degradation over time, making the switch worthwhile for archival mailings. Diagonal seam construction adds strength compared to side-seam designs for heavier inserts.

Suits high-volume office mailing

Offices sending 500 or more pieces of correspondence benefit from the box quantity and consistent window placement for automated insertion equipment. The vellum finish feeds reliably through postage meters and folder-inserters. Not laser compatible, so buyers who need to print directly on envelopes with laser printers should look elsewhere. The remoistening seal requires moisture to activate, which may not suit users preferring peel-and-seal or self-seal closures.