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Use Polyester (PET) Sheets for matboard windows, encapsulating irregular sizes, interleaving or any archival application. Archival polyester will not discolor, damage, or adhere to items placed in it or next to it. This polyester material is approved by the Library of Congress for safe indefinite-term storage. We use DuPont inert Melinex® or a suitable equivalent.

For safe encapsulation, use acid-free double-sided transparent tape.

Scroll down for sheet sizes and pricing.
Polyester (mylar) SHEETS
11-5/8 x 17-9/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets 
11-5/8 x 17-9/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.


Note:
For polyester sleeves see Product Code: S1117R.

Base SKU: pet11174

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Polyester (mylar) SHEETS
14-7/8 x 22-13/16" " x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
14-7/8 x 22-13/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Note: For polyester sleeves see Product Code: s1422R

Base SKU: pet14224

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Polyester (mylar) SHEETS
15-5/8 x 18-9/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester (Mylar) Sheets  
15-5/8 x 18-9/16"    4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Note: For polyester sleeves see Product Code: S1518R.

Base SKU: pet15182

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Polyester (mylar) SHEETS
17-5/8 x 21-9/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
17-5/8 x 21-9/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Note: For polyester sleeves see Product Code: S1721R.

Base SKU: pet17214

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Polyester (mylar) SHEETS
18-5/8 x 24-9/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
18-5/8 x 24-9/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Note: For polyester sleeves see Product Code: S1824R.

Base SKU: pet18244

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Polyester (mylar) SHEETS
22-15/16 x 28-13/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
22-15/16 x 28-13/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Base SKU: pet22284

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Polyester (mylar) SHEETS
26-9/16 x 36-5/8" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
26-9/16 x 36-5/8"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.
Base SKU: pet26364

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Polyester (mylar) SHEETS
27-15/16 x 41-5/16" x 4 mil.
Use for indefinite storage.
Description:
Museum Grade Archival
Polyester 
(Mylar) Sheets  
27-15/16 x 41-5/16"   4 mil

Use polyester sheets as windows for framed pictures, encapsulating irregular sizes, interleaving or any archival application. Our polyester is approved by the Library of Congress for Indefinite Storage.

Note: For polyester sleeves see Product Code: S2741R

Base SKU: pet27414

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