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Typical Moduli and Expansion Coefficients
The modulus of a web represents the strength of the web under tension and is reported in GPa (Metric) and Mpsi(US). The CTE (Coefficients of Thermal Expansion) are hard to track down and are often approximate. The CHE (Coefficients of Hygroscopic Expansion) are even less known, so where values are shown they are mostly informed guesses. Values for paper/board are all set to a nominal 100. The coefficients are all expressed in terms of °C.
Choose a Web, select the value of interest and copy it.
Close this window and paste value into Modulus.
WebGPaMpsiCTECHE
Acetate1.80.2613080
PC2.40.353030
PE10.151005
PET4.40.641515
PMMA2.10.3070100
PP3.10.45905
PVC2.80.4150?
Nylon 6 (PA)0.950.148560
PI9.11.3255?
Board30.44100100
Bond1.80.26100100
Magazine10.15100100
LightWeightCoatedPaper5.50.80100100
MachineFinishedCoated5.70.83100100
NewsPrint40.58100100
FineCoatedPaper6.30.91100100
SuperCalendared7.91.15100100
Aluminium6910230
Steel20029120
Summary of Inputs and Outputs
Inputs
TRiseTemperature Rise (can be negative!)
CTECoefficient of Thermal Expansion
HRiseHumidity Rise
CHECoefficient of Hygroscopic Expansion
Mod.Modulus of the web (GPa or Mpsi)
ThicknessWeb thickness (µm or mil)
Outputs
Strain %The % by which each web is expanded
Rad. CurlRadius of the curl. Smaller=Worse