Engineering plastics – The Manual - F.wood-supply.dk

O O C
O
n
O
160
C
O
C
H H
O C C O
H H
n
H
C
H
PEEK
PET
120
PP
80
N
PEI
O
C
C
O
O
Structural formula PEI
CH 3
C
CH 3
O
CH 2
CH 2
N
n
• Stress [MPa]
40 O
O
O
O
C
C
C
C
-R N
N -R N
n
0
C
C
C
0 10 20 30
40
• O Strain [%]
O
O
TECAPEI
PI TECAPEI
O
C
C
O
N
m
PPO
O
TECAPEI
O
C
n
C H 3
H
H
C C
n
CH 2 H
CH
CH 3
PEK
PEI (DIN designation)
Polyetherimide (PEI) is an amorphous thermoplastic with
high mechanical strength and rigidity. Due to its characteristics,
PEI has a great affinity to the group of polyarylsuphones
(PSU, PPSU) but belongs to the thermoplastic polyimides
group. The material demonstrates a remarkably
high creep strength over a wide temperature range. PEI
also demonstrates a high long-term service temperature.
The characteristic profile is rounded off by very good hydrolysis
resistance and dimensional stability. Due to its
amorphous molecular structure, PEI is transparent and has
a golden yellow colour.
PMP
Properties
ˌˌAmorphous
ˌˌTransparent with thin wall thicknesses
and polished surface
ˌˌLow density
ˌˌHigh strength, hardness and rigidity
ˌˌHigh degree of toughness
ˌˌHigh thermal stability
ˌˌVery high chemical resistance
ˌˌVery low moisture absorption
ˌˌMinimal thermal expansion
ˌˌDimensionally stable
ˌˌCaution with strong solvents,
stress crack formation possible
ˌˌSuper-heated steam and hydrolysis-resistant
ˌˌLow dissipation factor,
suitable for high-frequency applications
ˌˌPermeable by and resistant to microwaves
ˌˌVery good electrical insulation properties
ˌˌInherently flame resistant, self-extinguishing
ˌˌHigh limiting oxygen index
ˌˌVery low energy release and minimal
proportion of toxic gases in case of fire
ˌˌGood machining properties
PPS
30