METRIC UNITS/ SI UNITS - TAPPI

METRIC UNITS/ SI UNITS

The metric system, using SI units, is required because your readership is international and SI units are used

throughout the world.

Basic units: * meter (length) * kilogram (mass) * second (time) * Ampere (electric current) * degrees Celsius

(temperature) * (luminous intensity

New units that have been introduced : * Newton (N) = Force * Pascal (Pa) = Pressure

It is equal to a Newton per square meter and corresponds to the familiar pounds per square inch (psi): 1 psi =

6.89 kilopascal.

The following are some of the common conversion factors for SI SI Unit conversions

Quantity or Test

Value in Trade or Customary

Conversion

Unit

X Factor

=

6.45

Area

square inches

0.0929

square feet

0.836

square yards

0.405

acres

3.760

Basis Weight* or

lb (17x22-500)

1.627

Substance

lb (24x36-500)

1.480

(500-sheet ream) or

lb (25x38-500)

1.406

Grammage* when

lb (25x40-500)

4.882

expressed in g/m2

pounds per 1000 sq ft

(Paperboard)

Breaking Length

meters

0.001

Burst Index

g/cm2

0.0981

g/m2

Bursting Strength

pounds per square inch

6.89

Caliper

mils

0.0254

Concora Crush

pounds

4.45

Edge Crush

pounds per inch

0.175

Energy

British thermal units (Btu)

1055

Flat Crush

pounds per square inch

6.89

Force

kilograms

9.81

pounds

4.45

0.1

Length

angstroms

1

microns

0.0254

mils

0.305

feet

0.907

Mass

tons (2000 lbs.)

0.454

pounds

28.3

ounces (avd p)

Mass per Unit Volume ounces per gallon

7.49

pounds per cubic foot

1.60

Puncture Resistance

foot pounds

1.36

Ring Crush

pounds (for a 6¡± length)

0.0292

Stiffness (Taber)

gram centimeters (Taber

0.0981

Units)

Tear Strength

grams

9.81

Tensile Breaking Load pounds per inch

0.175

kilograms per 15 millimeters

0.654

Volume, Fluid

ounces (US Fluid)

29.6

gallons

3.79

16.4

Volume, Solid

cubic inches

0.0283

cubic feet

0.765

cubic yards

* See TAPPI Technical Information Paper 0800.01 for additional SI Unit conversions

Value in SI Unit

Symbol

square centimeters

square meters

square meters

hectares

grams per square meter

grams per square meter

grams per square meter

grams per square meter

grams per square meter

cm2

m2

m2

ha

g/m2

g/m2

g/m2

g/m2

g/m2

kilometers

kilopascals

grams per square meter

kilopascals

millimeters

newtons

kilomewtons per meter

joules

kilopascals

newtons

newtons

nanometers

micrometers

millimeters

meters

metric tons

kilograms

grams

kilograms per cubic meter

kilograms per cubic meter

joules

kilonewtons per meter

millinewton meters

km

KPa.m2/g

g/m2

kPa

mm

N

kN/m

J

kPa

N

N

nm

?m

mm

m

t

kg

g

kg/m3

kg/m3

J

KN/m

mN? m

millinewtons

kilonewtons per meter

kilonewtons per meter

milliliters

liters

cubic centimeters

cubic meters

cubic meters

mN

kN/m

kN/m

mL

L

Cm3

m3

m3

For Information on TAPPI's Style Guide, please visit

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