Standard: TAPPI - T 489 OM


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This test method covers a procedure used to measure the resistance to bending of paper and paperboard.

This test method is used to determine the bending moment required to deflect the free end of a 38 mm (1.5 in.) wide vertically clamped specimen 15° from its center line when the load is applied 50 mm (1.97 in.) away from the clamp. The resistance to bending is calculated from the bending moment. 

TAPPI T 566 "Bending Resistance (Stiffness) of Paper (Taber-Type Tester in 0 to 10 Taber Stiffness Unit Configuration)" describes a modification of the instrument described in this test method for measurements in the 0 to 10 Taber stiffness range only, and which requires a smaller test specimen. The modified procedure may be recommended for papers which are low in grammage, highly flexible, or both.

Test results obtained using modifications of the basic Taber-type instrument such as that described in TAPPI T 566 "Bending Resistance (Stiffness) of Paper (Taber-Type Tester in 0 to 10 Taber Stiffness Unit Configuration)" have been reported to be as much as 40% different from those obtained using this test method, and such modifications must not be used when this test method is specified.

Other procedures for measuring bending resistance include TAPPI T 535 "Stiffness of Paperboard (Resonance Length Method)" and TAPPI T 543 "Bending Resistance (Stiffness) of Paper (Gurley-Type Stiffness Tester)." The latter method has been classified as Classical.

Organization: TAPPI
Document Number: t 489 om
Publish Date: 2013-01-01
Page Count: 5
Change Type: STCH
Available Languages: EN
DOD Adopted: NO
ANSI Approved: YES
Most Recent Revision: NO
Current Version: NO
Status: Inactive

Document History

Document # Change Type Update Date Revision Status
TAPPI T 489 Change Type: COMPLETE REVISION Update Date: 2015-01-01 Revision: 15 Status: ACTV
T 489 OM Change Type: STCH Update Date: 2008-01-01 Status: INAC
T 489 OM Change Type: Update Date: 2004-01-01 Status: INAC
T 489 OM Change Type: Update Date: 1999-08-19 Status: INAC
T 489 OM Change Type: Update Date: 1992-01-01 Status: INAC