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White #10 poly window envelopes in a box of 500

WESTERN STATES

WESTERN STATES #10 Poly Window Envelope 4.125 x 9.5 White 500 Box

SKU CH-EMQ5-1QQ12

White #10 business envelopes with a poly window, diagonal seam and vellum finish, SFI-certified 20 lb sulphite paper at 92 % brightness, 500 per box

  • White sulphite paper is SFI certified
  • 92% brightness gives crisp document appearance
  • Vellum finish resists smudging during handling
  • Poly window protects contents while showing address
  • Diagonal seam construction adds envelope strength

Standard #10 Business Envelope

These #10 poly window envelopes measure 4.125 x 9.5 inches and come in a box of 500. They feature white sulphite paper with 92% brightness and a vellum finish. The diagonal seam construction and remoistening seal provide reliable closure for daily mailing tasks. SFI certification confirms responsible forestry sourcing for the paper stock.

High-Volume Office Mailing

Suits offices sending invoices, statements or direct mail where the recipient address shows through the 1-1/8 x 4-3/4 inch window. The 20 lb weight handles standard postal processing without added bulk. Not suited for heavy inserts that exceed the paper weight or for correspondence requiring security tinting to hide contents.

Desk-Ready Mailing Component

Each box weighs 6.5 lbs and stores flat until needed. The flap-down design feeds smoothly through most folder-inserters and postage meters. No special equipment is required beyond a standard printer for the enclosure documents. A full carton holds 2500 envelopes for larger mailroom inventories.

Highlights

  • White sulphite paper is SFI certified
  • 92% brightness gives crisp document appearance
  • Vellum finish resists smudging during handling
  • Poly window protects contents while showing address
  • Diagonal seam construction adds envelope strength

Specifications

BrandThe Envelope Supplies Shop

Questions about this item

What size paper fits inside the 4.125 x 9.5 envelope?

The envelope accepts standard US letter sheets folded to fit the 4.125 by 9.5 inch interior.

Can I run these through an older laser printer with a straight paper path?

The 20 lb sulphite stock and diagonal seam feed reliably through most straight-path laser printers.

How do I verify the window placement matches my letterhead?

Measure 3/4 inch from the left edge and 1/2 inch from the bottom to the window corner; the opening is 1-1/8 by 4-3/4 inches.

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