JCP K20 25% Index, White and Colored 1 February 1, 2008 

Index Paper FSC 7530 

 

Use Information: This paragraph is informational only and is not exclusively definitive of the end use. 

For high quality face and back offset printing of card indexes, identification cards, office forms, notices, posters, covers, etc. 
requiring execution with pen and ink, erasing quality, and above average permanence. Printed matter may include text, 
illustrations, and halftones and solid reverses.

 

Stock: Not less than 25% cotton or linen fibers; the 
remainder bleached chemical woodpulp. 

Note: Not less than 20% postconsumer fiber. Any percent 
over 20 percentage points, is encouraged, provided that 
the requirements of this Standard are met. 

 

Acidity: pH value, average, not less than 6.5 for white 
paper and 5.0 for colored paper. The rosin content shall be 
less than 2.5% for papers with pH value less than 6.5 

 

 

Basis weight: 25-1/2 by 
30-1/2 inches, 500 sheets 
(pounds) …………………. 

 

 

90 

 

 

110 

 

 

140 

 

 

170 

A tolerance of +5% shall be allowed. 

 

 

 

 

 

 

 

 

Bursting strength: 
Average not less than 
(lb/in2) …………………… 

 

 

40 

 

 

65 

 

 

85 

 

 

100 

 

 

 

 

 

 

Thickness: Average (mils) 

7.5 

9.0 

11.5 

13.8 



A tolerance of +0.0005 inch shall be allowed. Paper shall 
be uniform and shall not vary more than 0.0004 inch from 
edge to edge. 

 

 

Ruling and writing quality: Lines ruled and character 
written with ball point and felt tip pens shall be clear cut 

and free from excessive feathering. 

 

Erasing quality: Paper shall retain good ruling, writing, 
and typing quality, texture, and surface appearance, 
without ink spreading after repeated erasure. 

 

General appearance: Paper shall conform to the standard 
sample(s) established by the Government. 

Brightness: The white paper shall have a target brightness 
not less than 80% or as specified. 

Color:2 The paper in the order (or publication) shall be 
uniform and the color variation shall not exceed 
DE(CIELAB) = 1.0. 

 For colored stock, paper shall match one of the 
established color standards in Part 3 or match a color 
sample supplied by the ordering agency. Colors shall not 
fade or transfer (rub off) and shall appear even and 
uniform on the surface of the sheet. The sheet shall not be 
2-sided. 

Finish and formation: Shall be uniform. 

Cleanliness: The dirt count for each side of the paper shall 
not exceed 250 specks per square meter. No sample sheet 
(600 to 650 cm2 in size) shall contain more than one defect 
with equivalent area of 0.25 mm2 or greater 

 

 

 

Testing: Shall be conducted in accordance with methods in part 2, Government Paper Specification Standards. The 
acceptance criteria Part 4 shall apply. 

 

 

 

 

 

 

 

 

 

 

 

 

 

__________ 

1 This grade is typically not available in less than mill run quantities. 

 

2 The GPO stocks these colors (blue, buff, green, pink, salmon, yellow). Exact matches to these are available in mill run 
quantities: