FSC 9310                                                         JCP R30
                            BOOK COVER BOARD
Miscellaneous Board                                     February 1, 1999
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Use information: This paragraph is informational only and is not 
    exclusively definitive of the end use.
  For production of rigid bindings of ledger and text books when covered 
with materials such as buckram, fabrikoid, drilling, book   cloth, etc.

Stock: Not less than 80 pct postconsumer fiber. Any percent over 80 
    percentage points, is encouraged, provided that the requirements of 
    this Standard are met.


Grammage (g/m \2\)......................    5,115    3,835    2,705    2,420    2,190    1,840    1,485    1,125
  Basis weight: 25\1/4\ by 30\1/4\              9       12       17       19       21       25       31       41
 inches, 50 pounds (number).............
  A tolerance of 6 pct shall
   be allowed.

Bursting strength: Average, not less        5,510    4,130    3,100    2,930    2,650    2,170    1,750    1,440
 than (kPa).............................
  Equivalent (lb/in\2\).................      800      599      450      425      385      315      254      210

Thickness: Average (mm).................      5.6      4.3      3.0      2.7      2.5      2.0      1.6     1.25
  Equivalent (inch).....................     0.22     0.17     0.12     0.11    0.098    0.079    0.065    0.049

    A tolerance of 0.08 mm (0.003 inch) shall be allowed; 
   except for No. 9 and 12 board, then a tolerance of 5 pct 
                             shall be allowed.
     On boards with the shorter dimension over 813 mm (32 inches), an 
   additional 50 pct of the above thickness tolerance shall be allowed.
Density: Shall average 0.8 to 1.0 g/cm \3\. The average shall be 
  calculated from determinations made individually on each sheet of the 
  test sample.
General appearance: The surface shall be free from surface 

  lumps, clip indentations, and mechanical imperfections, and be 
  reasonably smooth and flat.
Sampling and testing: Shall be conducted in accordance with standards in 
  Part 2, Government Paper Specification Standards.

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 Unless otherwise specified, the following is automatically waived when 
  printing or duplicating is to be accomplished on commercial contract
Curl: Paper board shall lie flat with either no tendency to curl or with 
  a curl which can be overcome under reasonable working conditions.

Size and trim: Sufficient trim of not less than 13 mm (0.5 inch) 

  shall be allowed on both dimensions of the sheet. Board shall be 
  trimmed square on all four sides with smooth edges.
Pressroom conditions: The bulk of this paper board will be used in air-
  conditioned pressrooms maintained at 24  deg.C 2  deg.C 
  and 
  45 pct 8 pct relative humidity.