The great variety of different plastic grades and their characteristics is confusing. How to classify them based on what is expected from the end product.
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Plastic material classification from the product designer perspective.
1. PMMA
POMPA 46
HDPE
LDPEPBT
PC
PP
PS
PSU PETPPSU
PEI
PE PPS PEEK LCP
PA 6
PC/ABS
PVC
EVA
PVC
PTFE
PPA
PSU
The great variety of different plastic grades and their characteristics is confusing, not
only for consumers, but for plastic product designers as well. What are the differences
between the different abbreviations? What type of applications are they suitable for ?
2. What are your expectations?
Glossy surface?
Transparency?
Strength?
Stiffness?
Cost?
Bearing properties?
Heat resistance?
...
Let’s look at the different plastic materials from another perspective –
what do we expect from the product and therefore also from the
material it is made of?
3. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
• Recommended for structural
applications only
• Predominantly transparent
• Easier to process straight and
accurate components
• Good surface appearance
• Sensitive to stress-cracking
and fatigue
• Easier to bond
• Soften gradually
• Better for machine design
applications (wear, stress,
fatigue)
• Predominantly opaque
• More challenging to
process due to higher and
inhomogenous shrinkage
• Better resistance against
stress-cracking and
fatigue
• Some grades are difficult
to bond and print on
• Integral hinge usually
possilble
• Sharp melting point
Plastics are typically divided into Semi-crystalline and Amorphous grades. The
differences between the two groups are essential to recognize. Which one better
meets the expectations of your product?
4. Reinforced
Semi-crystalline Amorphous
Plastics are also commonly reinforced with glass-fiber or, in demanding applications,
with carbon-fiber. Reinforcing changes their properties and characteristics
significantly. It is therefore best to treat them as a separate material group.
5. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Now some of the most common plastic grades are added to the picture. It still appears
quite confusing, but let’s look at it one characteristic at a time.
What is the quality that you are after?
6. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Low cost?
The plastics at the bottom of the chart are so-called ‘commodity plastics’. They are
inexpensive and useful in many applications but the limitations in their performance or
appearance makes them often unsuitable for more demanding use.
7. Reinforced
High performance?
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
On the opposite side of the chart we find so-called ‘high performance plastics’. They
offer good resistance against chemicals and endure elevated temperatures well.
They are very expensive but offer good possibilities when looking for alternatives for
other materials. They are not typically used on average consumer products.
8. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Transparency?
SAN and PS are mostly used on packages and consumables. Copolyester is a common choice for baby products today.
PMMA offers excellent transparency and resists UV-light well. PC is very impact resistant but bisphenol-A limits its use.
Amorphous PA12 has good stress cracking resistance. The high performance plastics at the top are slightly yellowish. PVC
can be transparent, but this quality is seldom utilized in practise. The only transparent Semi-crystalline alternative is PP-random-
copo, which, even at its best, is slightly ‘milky’ compared to the Amorphous grades.
9. Reinforced
Suitability for machine
design applications?
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Semi-crystalline materials should be preferred when the component is subjected to
wear, fatigue and continuous load. Especially PA, PBT and POM are widely used in
such applications, filled or unfilled.
10. Reinforced
Good bearing properties?
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
If low friction is required, PA and especially POM are known for their good bearing
properties.
11. Reinforced
Impact resistance?
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Some Amorphous materials are very impact resistant, especially PC. ABS retains its impact
resistance in cold conditions. Semi-crystalline materials have a tendency to be inherently
tough and therefore their impact resistance is usually at a reasonable level. Grades with high
reinforcement content, however, are very stiff which reduces their toughness and might
turn them brittle.
12. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Glossy surface?
Amorphous grades are commonly used in electrical appliances because of their glossy
surface. Some of the Semi-crystalline grades enable a very nice surface as well, but do
not share the common weaknesses of the Amorphous plastics. Processing challenges,
however, limit their use in glossy applications.
13. Reinforced
High strength and stiffness?
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
When high strength and stiffness are needed, plastics inevitably need reinforcing.
PA+GF and PBT+GF are the most commonly used grades. Reinforced PEEK, PPS and
PPA offer better resistance to heat and chemicals, but are far more expensive.
Reinforcements are sometimes used with Amorphous grades as well, but with the cost
of dull surface and frequent warping problems.
14. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Flexibility?
Sometimes flexibility and rubbery feeling are desired of the application. In addition
to TPE grades, PE-LD, EVA and plasticized PVC may be considered.
15. Reinforced
Semi-crystalline Amorphous
SAN
PS
PMMA
PC
PA6, PA66
PP-homo
PP-copo
PE-HD
PC/ABS
ASA
PBT
ABS
PPS+GF
PEEK+GF/CF
PA+GF
PBT+GF
PC+GF
ABS+GF
PPS, PEEK,
LCP
PEI, PSU,
PPSU, PES
PPA
pPA
PA46
PA12
PPA+GF
pPA+GF
POM
PVC hard
PP+GF
PVC soft
Copoly-ester
HI-PS
PC-HT
PE-LD, EVA
Chemical
resistance,
high service
temperature
All together:
Low price
Glossy surface
Machine-design
Rubbery
Transparency
Impact resistance
High strength and stiffness
Bea-ring
Hopefully you found this approach useful.
Please comment and suggest additions at www.plasticprop.com
16. 1. POM
2. PA6
3. PBT
4. ABS
5. PC/ABS
6. PS
7. PMMA
8. PC
9. PSU
10. PP, Random Copo
11. HDPE
12. LDPE
13. EVA
14. PVC, soft
15. TPE-S
16. PP+30 GF
17. PA66+30 GF
18. PBT+30 GF
19. pPA+50 GF
20. PPS+40 GF
To fully grasp the look and feel of different plastic grades
you can order the Plasticprop Essentials sample kit
including 20 commonly used plastics. It has been carefully
designed to convey and explain the characteristics of each
material.