Properties 

Polymethylmethacrylate
/PMMA

Topics   Index

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Copyright 2002 by Roger D. Corneliussen
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Values are from Modern Plastics Encyclopedia 99.

To jump to a particular property, click on the name listed below.

Melt Flow
Melting Temperature
Glass Transition
Processing Molding Pressure
Processing Molding Temperature
Compression Ratio
Mold Shrinkage
Tensile Strength
Elongation
Tensile Yield Strength
Compressive Strength
Flexural Strength
Tensile Modulus
Flexural Modulus
Izod Impact Strength
Hardness
Deflection Temperature
Thermal Expansion
Thermal Conductivity
Specific Gravity
Dielectric Strength
Water Absorption

Note: The ASTM numbers are linked to 
their descriptions on the ASTM website.  
To go to the description, simply
click on the ASTM number

Melt Flow 
ASTM D1238
(gm/10 min)

1.4 to 27 gm /10 min

Melting Temperature  degrees C
Tm Crystalline
--- C

Glass Transition (C)
Tg (Amorphous)

85 to 105 C

Processing Temperature Range Degrees F
Extrusion

300 to 425 F for compression molding
325 to 500 F for injection molding
360 to 500 F for extrusion

Molding Pressure Range ( PSI) (ksi)
5000 to 20000 psi
5 to 20 ksi
33 to 133 MPa

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Compression Ratio
1.6 to 3.0

Mold(Linear) Shrinkage (in/in)
ASTM D955
0.001 to 0.004 in/in (flow)
0.002 to 0.008 in/in (transverse)

Tensile Strength at Break
ASTM D638
7000 to 10500 psi
47 to 70 MPa

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Elongation at break (%)
ASTM D638
2 to 5.5 %

Tensile Yield Strength (psi)
ASTM D638
7800 to 10600 psi
52 to 71 MPa

Compressive Strength (psi)
Rupture or Yield
ASTM D695
10500 to 18000  psi
70 to 120 MPa

To go to Compressive Strength Values,
click on
Compressive Strength

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Flexural Strength (psi)
Rupture or Yield
ASTM D790
10500 to 19000  psi
70 to 127 MPa

Tensile Modulus (psi)
ASTM D638
325000 to 470000 psi
2.2 to 3.1 GPa

To go to Modulus Values,
click on
Modulus

Compressive Modulus (psi)
ASTM D695
370000 to 460000 psi
2.5 to 3.1 GPa

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Flexural Modulus (psi)
ASTM D790
At 73 F
325000 to 460000 psi
2.2 to 3.1 GPa
At 200 F
--- psi
--- GPa
At 250 F
--- psi
--- GPa
At 300 F
--- psi
--- GPa

Izod Impact (ft-lb/in of notch)
ASTM D256

0.2 to 0.4  ft lb/in of notch

To go to Izod Values,
click on
Izod

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Hardness
Rockwell ASTM D785
M68 to 105
--
Shore D65 ASTM D2240/D2583
---

Coefficient of Linear Thermal Expansion
(10 exp-6 )in/in/C
50 to 90 (10 x exp 6) in/in /C
0.000 050 to 0.000 090  in/in /C

Deflection Temperature under flexural load (F)
ASTM D648
264 psi ---
155 to 212 F
66 psi  ---
165 to 225 F

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Thermal Conductivity
(10 x exp 4)al cm/sec cm2 C
ASTM C177
4.0 to 6.0 (10 x exp 4) cal cm/sec cm2
0.0004 to 0.0006  cal cm/sec cm2

Specific Gravity
ASTM D792
1.17 to 1.20

To go to Density /Specific Gravity Values,
click on
Density

Water Absorption
(1/8 in thick specimen) (%)
ASTM D570
24 hr --- 0.1 to 0.4%
Saturation 
---  %

Dielectric Strength v/mil
(1/8 in thick Specimen; short time)
400 to 500 v/mil

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Topics   Index

**************************************
Copyright 2002 by Roger D. Corneliussen
No part of this transmission is to be
duplicated, in any manor, or forwarded by
electronic mail without the express written
permission of Roger D. Corneliussen
**************************************

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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