| Bursting strengh (Mullen #/ sq.inch)
|
| 55 minimum
|
| TAPPI T403-??
Stiffness (Taber V-5 Model 150-1)
|
Machine direction
|
| 17.0 minimum
|
|
|
Cross direction
|
| 8.0 minimum
|
|
Folding endurance (M.I.T.)
|
Machine direction
|
| 100 minimum
|
| TAPPI T423-?
|
Cross direction
|
| 100 minimum
|
|
Folding endurance after aging
|
Machine direction
|
| 25% retention
|
| TAPPI T453-?
Tearing resistance (Elmondorf)
|
Machine direction
|
| 125 minimum
|
| TAPPI T414-?
|
Cross direction
|
| 125 minimum
|
|
| Porosity ( Gurley ) seconds
|
| 50 to 200
|
| TAPPI T460-??
Smoothness Sheffield
|
Felt side
|
| 125 maximum
|
|
|
Wire side
|
| 125 maximum
|
|
| Sizing (See test procedures )
|
| Pen and ink test
|
|
| Percent ash
|
| 3.0 maximun
|
| TAPPI T413-??
| Acidity -ph value ) (Hot Extraction)
|
| 5.0 minimum
|
| TAPPI T435-??
Coefficient of friction ( Cards )
|
Static
|
| .30 to .45
|
|
|
Kinetic friction should not vary
|
|
|
|
|
more than 25% from Static friction
|
|
|
|
Warp of cards (20% R.H. and 75% R.H.)
|
Types of Top-to-bottom (TB)
|
| .12" maximum
|
|
|
Warp : End-to-end (EE)
|
| .25" maximum
|
|
|
Diagonal (D)
|
| .25" maximum
|
|
Moisture content (% of Original weight)
|
Test made on rolls at time of
|
|
|
|
|
conversion
|
| 4.5 to 6.5
|
| TAPPPI T412-??
Expansion ( 20% R.H. to 75% R.H. ) %
|
Machine direction
|
| .25% maximum
|
|
|
Cross direction
|
| .70% maximum
|
|
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