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Postcard Backings come in three grades of boards:

Economy: 0.030" thick, pH neutral chipboard, white one side. Short-term storage.
Standard Acid-free: 0.028" thick, acid-free cardboard, white both sides. Long-term storage.
Super-Archival: 0.040" thick, 100% Alpha Cellulose board, off-white, acid-free (alkaline pH 8.5). Lignin-free (alkaline pH 8.5). Conservation grade. Indefinite-term storage.

Postcard Backings
Postcard Backings
Description: 3-1/2 x 5-5/8"
0.030" thick, pH neutral chipboard.
Base SKU: kcb30pcr

Postcard Backings
Postcard Backings
Description: 3-1/2 x 5-5/8"
0.028" thick, acid-free, white two sides

Use for: SPCR2, SPCR4, SPPCR
Base SKU: kaf28pcr

Postcard Backings
Postcard Backings
Description: 3-1/2 x 5-5/8"
0.040" thick, acid-free, buffered, conservation grade. 

Use for: SPCR2, SPCR4, SPPCR
Base SKU: kaf40pcr

Postcard Backings
Postcard Backings
Description: 3-1/2 x 5-1/2"
0.040" thick, acid-free, buffered, conservation grade. 

Use for: S35R, SLV35
Base SKU: kaf4035

Postcard Backings
Postcard Backings
Description: 4-3/8 x 6-1/4"
0.030" thick, pH neutral chipboard.

Use for: SPCL2, SPCL4, SPPPCL
Base SKU: kcb30pcl

Postcard Backings
Postcard Backings
Description: 4-3/8 x 6-1/4"
0.028" thick, acid-free, white two sides

Use for: SPCL2, SPCL4, SPPPCL
Base SKU: kaf28pcl

Postcard Backings
Postcard Backings
Description: 4-3/8 x 6-1/4"
0.040" thick, acid-free, buffered, conservation grade. 

Use for: SPCL2, SPCL4, SPPPCL
Base SKU: kaf40pcl

Postcard Backings
Postcard Backings
Description: 4 x 6"
0.040" thick, acid-free, buffered, conservation grade. 

Use for: SP46R, SLV46
Base SKU: kaf4046

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