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Strain1 %

Strain2 %

Rad. Curl mm

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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.

Web	GPa	Mpsi	CTE	CHE
Acetate	1.8	0.26	130	80
PC	2.4	0.35	30	30
PE	1	0.15	100	5
PET	4.4	0.64	15	15
PMMA	2.1	0.30	70	100
PP	3.1	0.45	90	5
PVC	2.8	0.41	50	?
Nylon 6 (PA)	0.95	0.14	85	60
PI	9.1	1.32	55	?
Board	3	0.44	100	100
Bond	1.8	0.26	100	100
Magazine	1	0.15	100	100
LightWeightCoatedPaper	5.5	0.80	100	100
MachineFinishedCoated	5.7	0.83	100	100
NewsPrint	4	0.58	100	100
FineCoatedPaper	6.3	0.91	100	100
SuperCalendared	7.9	1.15	100	100
Aluminium	69	10	23	0
Steel	200	29	12	0

Summary of Inputs and Outputs

Inputs
TRise	Temperature Rise (can be negative!)
CTE	Coefficient of Thermal Expansion
HRise	Humidity Rise
CHE	Coefficient of Hygroscopic Expansion
Mod.	Modulus of the web (GPa or Mpsi)
Thickness	Web thickness (µm or mil)
Outputs
Strain %	The % by which each web is expanded
Rad. Curl	Radius of the curl. Smaller=Worse