Our First Day Cover Sleeves come in 2 materials
• Polyethylene 
for Long-term Storage
• Polyester (Mylar) for Indefinite Storage
For Poly material specifications click here.

The Backings for these sleeves also come in 2 materials:

• .028" thick Acid-free Board for Long-term Storage
• .040" thick Acid-free, Lignin-free, Buffered Board for Indefinite
 Storage
For Backing material specifications click here.

We have added a new style of Polyester sleeves called 'Folder' Sleeves which are sealed on one long side only. 
The inherent static in polyester material, keeps the stored image securely in place.

 
  



 

First Day Cover Sleeves. 4 x 6-3/4".
2.5 mil Polyethylene. Fits U.S cover - # 6 envelope.
Long-term Storage.
First Day Cover Sleeves - 2.5 mil Polyethylene
Description:
First Day Cover Sleeves
4 x 6-3/4"    2.5 mil Polyethylene.
Fits U.S. cover - # 6 envelope.

Open on one short end.
Long-term Storage.

Base SKU: sfdcus6

Related Products and Reviews

Backings for First Day Covers-U.S. Cover #6.
3-3/4 x 6-5/8".
Made form .028" thick Acid-Free Board.
Long-term Storage.
Description:
Backings for First Day Covers - U.S. Cover #6.
3-3/4 x 6-5/8"

.028" thick Acid-free Board.
Board is white on both sides. 
Use for long-term storage.

Use with polyethylene sleeve SFDUS6.

Base SKU: kaf28us6

Related Products and Reviews

Backings for First Day Covers - U.S. Cover #6.
3-3/4 x 6-5/8".
Made from .040" thick Acid Free Board.
Indefinite Storage.
Description:

**NEW**

Backings for First Day Covers - U.S. Cover #6. 
3-3/4 x 6-5/8"
.040" thick Acid Free Board.

Board is all white. Acid-Free, lignin-free, buffered.
Use for Indefinite Storage.

Use with polyethylene sleeve SFDCUS6.

Base SKU: kaf40us6

Related Products and Reviews

First Day Cover US #6 'Folder' Sleeve.
3-7/8 x 6-7/8". 4 mil Polyester.
Sealed on one long side.
Indefinite Storage.
Acid-free Polyester #6 Envelope Sleeve
Description:

**NEW**

First Day Cover US #6 Envelope 'FOLDER' Sleeve.
3-7/8 x 6-7/8"   4 mil Polyester 
(Mylar)
Sealed on one long side.

Crystal-clear archival material. 
• Approved for Indefinite Storage by the Library of Congress.
• Passed the Photo Activity Test (P.A.T.).

Base SKU: sfdcus6petf

Related Products and Reviews

Backings for First Day Covers - U.S. Cover #6.
3-5/8 x 6-3/4".
Made from .028" thick Acid Free Board.
Long-term Storage.
Description:

**NEW**

Backings for First Day Covers - U.S. Cover #6. 
3-5/8 x 6-3/4"
.028" thick Acid Free Board.

Board is white on both sides.
Use for long-term storage.

Use with Polyester (mylar) sleeve SFDCUS6PETF

Base SKU: kaf28us6pet

Related Products and Reviews

Backings for First Day Covers - U.S. Cover #6.
3-5/8 x 6-3/4".
Made from .040" thick Acid Free Board.
Indefinite Storage.
Description:

**NEW**

Backings for First Day Covers - U.S. Cover #6. 
3-5/8 x 6-3/4"
.040" thick Acid Free Board.

Board is all white. Acid-Free, lignin-free, buffered.
Use for Indefinite Storage.

Use with Polyester (mylar) sleeve SFDCUS6PETF

Base SKU: kaf40us6pet

Related Products and Reviews

First Day Cover Sleeves. 4-1/2 x 9-7/8".
2.5 mil Polyethylene. Fits U.S cover - # 10 envelope.
Long-term Storage.
First Day Cover Sleeves - 2.5 mil Polyethylene
Description:
First Day Cover Sleeves
4-1/2 x 9-7/8"   2.5 mil Polyethylene
Fits U.S. cover - #10 envelope

Open on one short end.

Long-term Storage.

Base SKU: sfdcus10

Related Products and Reviews

First Day Cover US #10 'Folder' Sleeve.
4-1/2 x 9-7/8". 4 mil Polyester.
Sealed on one long side.
Indefinite Storage.
Acid-free Polyester #10 Envelope Sleeve
Description:

**NEW**

First Day Cover US #10 Envelope 'FOLDER' Sleeve.
4-1/2 x 9-7/8"   4 mil Polyester 
(Mylar)
Sealed on one long side.

Crystal-clear archival material. 
• Approved for Indefinite Storage by the Library of Congress.
• Passed the Photo Activity Test (P.A.T.).

Base SKU: sfdcus10petf

Related Products and Reviews

Backings for First Day Covers.
U.S. Cover #10 Envelope. 4-1/4 x 9-3/4".
Made from .028" thick Acid Free Board.
Long-term Storage.
Description:

**NEW**

Backings for First Day Covers - U.S. Cover #10 Envelope. 
4-1/4 x 9-3/4"
.028" thick Acid Free Board.

Board is white on both sides.
Use for Long-term Storage.

Base SKU: kaf28us10

Related Products and Reviews

Backings for First Day Covers.
U.S. Cover #10 Envelope. 4-1/4 x 9-3/4".
Made from .040" thick Acid Free Board.
Indefinite Storage.
Description:

**NEW**

Backings for First Day Covers - U.S. Cover #10 Envelope. 
4-1/4 x 9-3/4"
.040" thick Acid Free Board.

Board is all white. Acid-Free, lignin-free, buffered.
Use for Indefinite Storage.

Use with Polyester (mylar) sleeve SFDCUS10PETF

Base SKU: kaf40us10

Related Products and Reviews

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