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White #10 airmail envelope with red blue border Par Avion text poly window vellum finish

WESTERN STATES

WESTERN STATES #10 Airmail Window Envelope 4.125 x 9.5 20# Red Blue Border Par Avion Box 500

SKU CH-EYYF-EVHYV

#10 airmail window envelopes with red and blue border and Par Avion marking, 4.125 x 9.5 inches, 20 lb paper, 92% brightness, box of 500

  • #10 standard size fits business correspondence
  • 92% brightness white sulphite paper ensures crisp print contrast
  • Red and blue airmail border with "Par Avion" identifies international mail instantly
  • Poly window 1-1/8" x 4-3/4" positioned 3/4" left and 1/2" bottom shows address without extra labels
  • Box of 500 envelopes with remoistening seal and diagonal seam for high-volume mailing

#10 Airmail Window Envelopes, 500-count box

These #10 airmail envelopes measure 4.125 by 9.5 inches and feature a poly window positioned 3/4 inch from the left and 1/2 inch from the bottom. White sulphite paper with a vellum finish and 92% brightness provides a clean surface for addresses. The diagonal seam and remoistening seal are designed for reliable closure during transit. Red and blue borders with "Par Avion" markings identify international mail at a glance.

Suited for high-volume international mailings

Businesses sending invoices, statements or letters abroad by airmail will find the pre-printed borders and window layout convenient. Domestic-only mailers who do not need airmail markings may prefer plain window envelopes. Organisations requiring custom window positions or heavier paper stock should look elsewhere. The 20-lb stock and standard dimensions fit most inserting equipment and postal regulations for letter-rate mail.

Consistent feeding through extended print runs

The diagonal seam construction and vellum finish reduce friction in high-speed inserters and laser printers. SFI-certified sulphite paper maintains dimensional stability across large jobs, limiting jams or misfeeds. Remoistening adhesive activates reliably after prolonged storage in the box. The 500-envelope carton supports continuous operation without frequent reloading.

How it compares

Measured against everything we stock in Document Envelopes & Pouches, at today’s prices. Recalculated every night.

Price $91.99
Pricier than about 79% of the 638 comparable items (median $61.99).

Specifications

Product
Brand nameThe Envelope Supplies Shop

Questions about this item

What paper size must the contents be to show through the A-style window?

The A-style window measures 1-1/8" x 4-3/4" and sits 3/4" from the left edge and 1/2" from the bottom, so size the address block to fit that frame.

Will these envelopes feed reliably in a laser printer that handles standard #10 stock?

Yes, they are 20# white sulphite paper with a vellum finish and a diagonal seam, matching the weight and construction of typical #10 envelopes used in laser trays.

How can I confirm the envelopes meet the 92% brightness spec after opening the box?

Compare a sheet under daylight against a known 92% brightness reference; the vellum finish should appear crisp white with the red and blue airmail border and "Par Avion" print sharp on both sides.

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