Polymethylmethacrylate
/PMMA
**************************************
Copyright 2002 by Roger D. Corneliussen
**************************************
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
To
go back to the top of this page, click on
Top
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
To
go back to the top of this page, click on
Top
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
To
go back to the top of this page, click on
Top
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
To
go back to the top of this page, click on
Top
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
To
go back to the top of this page, click on
Top
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
To
go back to the top of this page, click on
Top
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
**************************************
To
go back to the top of this page, click on
Top
**************************************
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
**************************************
Number of visits since 4/12/2000: