2. No. 1
PS PP
PVC
LDPE HDPE
PS/PPE
PC PA/PPE
PC/ABS PC / PBT
PC/ASA PA PBT PET
ABS ASA PMMA POM mPP
PEEK
PEI LCP
PES PPS
PSU HTN
HHPC
Amorphous Crystalline
High Performance
(1%)
Engineering Polymers
(13%)
Commoditie
(86%)
PLASTICS IN THE MARKET
Understand the value proposition and application
need are the keys to select the appropriate
material.
3. No. 2
AMORPHOUS
•Random Entanglement
•Transparent in natural form.
•Impact Resistance
•Low shrinkage, dimension controlled
•Wide Softening Point
•Weak Chemical Resistance
SEMI-CRYSTALLINE
•Some Order Entanglement
•Chemical Resistance
•Good Lubricity/Wear Resistance
•Fatigue Endurance
•Heat Resistance, esp.for filled material.
•Notch Sensitivity/Low Impact.
•High Shrinkage/High Warpage
KEYS DIFFERENT BASE ON MORPHORLOGY
4. No. 3
AMORPHOUS
1.Can be transparent in natural form
2.Shrinkage is small, around 0.5-
0.8% for unfilled.
3.Higher toughness , less notched
sensitivity if compare with same
material.
4.Wide softening point, wider
processing windows.
5.Higher melt strength, more suitable
for extrusion application than semi-
crystalline material.
SEMI CRYSTALLINE
1.Higher heat resistance, especially for
rigid reinforcement product.
2.Better chemical resistance.
3.Lubricity, less wear for moving
part.
4.Good fatigue resistance.
5.Higher flow ability, more suitable for
thin wall application.
KEY ADVANTAGES BETWEEN TWO ALIGNMENT
6. No. 5
ULTEM, PEI
ULTEM Resin is an amorphous, transparent, amber, Polyetherimide plastic offering
outstanding high heat resistance, high strength, modulus and broad chemical resistance
Characteristics:
•Long-term heat resistance – RTI up to 180°C
•Dimensional stability
•Inherent flame resistance, ECO compliance
•Low smoke evolution and low smoke toxicity
•Strength and modulus at elevated temperatures
•Global Food contact approvals
O O
O
O
O
O
NH2H2N
O O
N
O
O
O O
N N
O
O
O
O
NH2
+
n
• Hydrolytic and chemical stability
• Medical approvals, USP class VI and ISO 10993
• Potable water contact approvals
• Gamma, EtO, & Steam Sterilizable
• Metalisable via PVD/PE-CVD and electroplating
• Low Ionic Contamination
7. No. 6
LEXAN, PC
Lexan is an Amorphous material, offering excellent impact strength, clarity and high heat
resistance
O
CH3
CH3
O C
O
Characteristics
•One of the most toughness ETP material
•High temperature resistance, Tg 150 C,
RTI up to 130 C.
•Broad range of MFI, variety of processing.
•FDA compliance
•Excellent coloring, various color from
transparent to opaque.
•Sterilizable
•Low Ionic contamination
8. No. 7
MAIN CTQS FOR HDD PLASTIC PARTS
Dimension
--Flatness
--Position
Function
--ESD protect
--Wear resistance
Cleanliness
Reduces potential media damage by corrosion from outgassing volatiles and ionic
contamination eg. Sulphates, Nitrates, Chlorides, etc and particles dropped from
molded parts.
Trend : Lower flying head heights & Increased drive speed – Increase potential of
damage
Need to extend drive life or product reliability
Promotes more accurate and reliable data reading
Make Precision Part
Make Clean Part
9. No. 8
ELECTRO STATIC PROTECTION
• The electrical charge is the result of transfer
elector that occurs due to the sliding, rubbing,
or separating of material which is prime to
electrostatic voltage such as plastics, rubber,
textile.
• For the insulating material like plastics, this
charge would remain in some area and can
be discharged when via an arc or spark when
the material contact with the different
potential body such as circuit, human, etc.
that cause minor to severe damage.
• To avoid the potential damage from
electrostatic charges, the material need to be
“more electron conductor” by the reduction of
electric resistivity.
10. No. 9
ADDITIVE FOR ESD MATERIAL
• FOR HDD industries, the most common additive for ESD protection are Carbon Powder
and Carbon Fiber
• Carbon Fiber also can be the reinforcement to plastics material, it can increase the
stiffness of plastic materials tremendously.
• Carbon sloughing is the issue of carbon powder additive. When the parts contact with
another parts, the carbon powder can come out from the parts. It could cause the
contamination issue. Thus, the selected application is necessary for Carbon powder
additive.
11. No. 10
ESD MECHANISM
To build an electronic path through physical contact of
carbon powder to dissipate the static charges.
Conductive
Carbon Black
Carbon FiberGraphite Fibrils
