Polyphenylene Sulfide (PPS)

Polyphenylene Sulfide (PPS)

Polyphenylene sulfide (PPS) is an organic polymer consisting of aromatic rings linked with sulfides. Synthetic fiber and textiles derived from this polymer are known to resist chemical and thermal attack. PPS is used to make filter fabric for coalboilers, papermakingfelts, electrical insulation, specialty membranes, gaskets, and packings. PPS is the precursor to a conducting polymer of the semi-flexible rod polymer family. The PPS, which is otherwise insulating, can be converted to the semiconducting form by oxidation or use of dopants.
Polyphenylene sulfide is an engineering plastic, commonly used today as a high-performance thermoplastic. PPS can be molded, extruded, or machined to high tolerances. In its pure solid form, it may be opaque white to light tan in color. Maximum service temperature is 218 °C (424 °F). PPS has not been found to dissolve in any solvent at temperatures below ±200 °C (392 °F). An easy way to identify the compound is by the metallic sound it makes when struck.
PPS is one of the most important high temperature thermoplastic polymers because it exhibits a number of desirable properties. These properties include resistance to heat, acids and alkalies, and to mildew, to bleaches, aging, sunlight, and abrasion. It absorbs only small amounts of solvents and resists dyeing.

General Properties:

Physical

Nominal Value

Unit

Test Method

Specific Gravity      
1.35 to 1.36 ASTM D792  
73°F 1.31 to 1.81 g/cm3 ISO 1183
Melt Mass-Flow Rate (MFR) (315°C/5.0 kg) 75 to 200 g/10 min ASTM D1238
Molding Shrinkage      
Flow : 73°F 3.0E-4 to 0.014 in/in ASTM D955
Across Flow : 73°F 4.3E-3 to 0.015 in/in ASTM D955
73°F 0.18 to 2.3 % ISO 294-4
Water Absorption (73°F, 24 hr) 0.020 to 0.031 % ASTM D570

Mechanical

Nominal Value

Unit

Test Method

Tensile Modulus      
73°F 325000 to 4.06E+6 psi ASTM D638
73°F 491000 to 2.19E+6 psi ISO 527-2
Tensile Strength      
Yield, 73°F 7250 to 23200 psi ASTM D638
Break, 73°F 7250 to 23200 psi ASTM D638
Break, 73°F 9090 to 13400 psi ISO 527-2
73°F 5880 to 25300 psi ASTM D638
Tensile Elongation      
Yield, 73°F 0.91 to 1.6 % ASTM D638
Break, 73°F 0.40 to 4.1 % ASTM D638
Flexural Modulus      
73°F 348000 to 3.54E+6 psi ASTM D790
73°F 522000 to 653000 psi ISO 178
Flexural Strength      
73°F 8340 to 36800 psi ASTM D790
73°F 9320 to 22000 psi ISO 178
Coefficient of Friction 0.090 to 0.40   ASTM D1894

Impact

Nominal Value

Unit

Test Method

Charpy Notched Impact Strength (73°F) 0.52 to 3.8 ft·lb/in2 ISO 179
Charpy Notched Impact Strength (73°F) 0.52 to 3.8 ft·lb/in2 ISO 179
CharpyUnnotched Impact Strength (73°F) 0.52 to 24 ft·lb/in2 ISO 179
CharpyUnnotched Impact Strength (73°F) 0.52 to 24 ft·lb/in2 ISO 179
Notched Izod Impact (73°F) 0.46 to 1.5 ft·lb/in ASTM D256
UnnotchedIzod Impact (73°F) 1.0 to 37 ft·lb/in ASTM D256
Hardness Nominal Value Unit Test Method
Rockwell Hardness (73°F) 92 to 126 ASTM D785

Thermal

Nominal Value

Unit

Test Method

Deflection Temperature Under Load      
66 psi, Unannealed 531 to 538 °F ASTM D648
66 psi, Unannealed 531 to 538 °F ASTM D648
264 psi, Unannealed 214 to 512 °F ASTM D648
264 psi, Unannealed 203 to 518 °F ISO 75-2/A
Melting Temperature 532 to 536 °F ISO 11357-3
CLTE      
Flow 7.3E-6 to 2.9E-5 in/in/°F ASTM D696
Flow 2.8E-6 to 3.5E-5 in/in/°F ISO 11359-2
Transverse 2.8E-6 to 3.5E-5 in/in/°F ISO 11359-2
Thermal Conductivity (73°F) 2.0 to 140 Btu·in/hr/ft2/°F ASTM C177

Electrical

Nominal Value

Unit

Test Method

Surface Resistivity 6.0 to 2.5E+15 ohms ASTM D257
Volume Resistivity      
73°F 10 to 2.5E+16 ohms·cm ASTM D257
73°F 1.0E+11 to 2.0E+16 ohms·cm IEC 60093
Dielectric Strength      
73°F 400 to 450 V/mil ASTM D149
73°F 430 to 770 V/mil IEC 60243-1
Dielectric Constant (73°F) 3.00 to 3.05   ASTM D150
Dissipation Factor      
73°F 6.5E-4 to 5.0E-3   ASTM D150
73°F 6.5E-4 to 5.0E-3   IEC 60250
Arc Resistance 118 to 125 sec ASTM D495
Comparative Tracking Index 100 to 151 V IEC 60112

Injection

Nominal Value

Unit

Drying Temperature 250 to 325 °F
Drying Time 3.0 to 6.0 hr
Drying Time 3.0 to 6.0 hr
Suggested Max Moisture 0.015 to 0.020 %
Rear Temperature 464 to 613 °F
Middle Temperature 567 to 625 °F
Front Temperature 584 to 613 °F
Nozzle Temperature 580 to 617 °F
Processing (Melt) Temp 596 to 635 °F
Mold Temperature 292 to 316 °F
Injection Pressure 8700 to 16500 psi
Holding Pressure 6530 to 10500 psi
Back Pressure 45.0 to 230 psi
Screw Speed 55 to 128 rpm

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2014-06-08T07:48:57+00:00
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2014-06-08T07:49:23+00:00
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2014-06-08T07:50:26+00:00
“McCafferty BM Design Ltd, KENT United Kingdom” – Most of the O rings manufacturing company suggested to use larger diameter and expensive elastomers. We learnt with Mech Spares that elastomer being weaker compare to metal and alloys and needs appropriate back up for high pressure or high vacuum applications. Further not necessary the most expensive View Full →

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2014-06-08T07:17:16+00:00
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