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PPS
PPS
PPS(Polyphenylene Sulfide)는 치수안정성이 가장 뛰어난 플라스틱 중 하나로, 탁월한 내화학성 및 내열성을 동시에 가지고 있어 고온의 내화학성이 요구되는 화학플렌트, 의약품, 반도체 제작공정 등 정밀기기부품으로 다양하게 사용되고 있다. 각 Maker별로 상이한 상표(Trade Name)로 제품을 판매하고 있는데 Ryton(Chevron Phillips Chemical), Techtron(콰드란트)이 대표적이다
특징
220℃까지 뛰어난 강도 경도 유지(-20℃)
탁월한 내화학성(200℃ 이하에서 반응하는 유기용재 없음)
수분흡수율 거의 없음
뛰어난 스팀내성
내방사성
낮은 열팽창계수(치수 안정성)
탁월한 전기적 특성
내화염성(UL94 V-0 급)
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PHYSICAL PROPERTIES
Natural type of PPS
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UNITS
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ASTM
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RESULTS
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Density
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lb/in3
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D792
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0.049
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Water Absorption, 24 hrs
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%
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D570
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0.01
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MECHANICAL PROPERTIES
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UNITS
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ASTM
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RESULTS
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Tensile Strength
|
psi
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D638
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13500
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Tensile Modulus
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psi
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D638
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500000
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Tensile Elongation @Break
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%
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D638
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15
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Flexural Strength
|
psi
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D790
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21000
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Flexural Modulus
|
psi
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400000
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575000
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Compressive Strength
|
psi
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D695
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21500
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Compressive Modulus
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psi
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D695
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430000
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Hardness, Rockwell R
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D785
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R125/M95
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IZOD Impact Strength Notched
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ft-lb/in
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D256
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0.6
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THERMAL PROPERTIES
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UNITS
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ASTM
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RESULTS
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Coefficient of Linear Thermal Expansion
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(x 10-5 in./in./°F)
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D256
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2.8
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Heat Deflection Temp at 264 psi
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°F
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250
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Max Operating Temp
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°F
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425
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Thermal Conductivity
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BTU-in/ft2-hr-°F
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C177
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2
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Flammability Rating
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UL94
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V - O
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ELECTRICAL PROPERTIES
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UNITS
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ASTM
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RESULTS
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Dielectric Strength
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V/mil
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D149
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540 @1/8" th.
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Dielectric Constant @ 1 MHz
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D150
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3
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Dissipation Factor @ 1 MHz
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D150
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0.0013
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Volume Resistivity, 50% RH
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ohm-cm
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D257
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4.5 x 101
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TYPICAL PROPERTIES of EXTRUDED TECHTRON PPS &PEEK GRADES
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ASTM or UL test
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Property
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Techtron PPS
Unfilled
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Techtron HPV
Bearing Grade
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PEEK
Unfilled
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Ketron HPV
Bearing Grade
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PHYSICAL
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D792
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Density (lb/in³)
(g/cm³)
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0.049
1.35
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0.052
1.43
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0.047
1.31
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0.052
1.44
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D570
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Water Absorption, 24 hrs (%)
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0.01
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0.01
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0.01
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0.005
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D570
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Water Absorption, Saturation (%)
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0.03
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0.09
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0.05
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0.03
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MECHANICAL
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D638
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Tensile Strength (psi)
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13,500
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10,900
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16,000
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11,000
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D638
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Tensile Modulus (psi)
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500,000
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540,000
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500,000
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850,000
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D638
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Tensile Elongation at Break (%)
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15
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5
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20
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2
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D790
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Flexural Strength (psi)
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21,000
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10,500
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25,000
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27,500
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D790
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Flexural Modulus (psi)
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575,000
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535,000
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600,000
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1,100,000
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D695
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Compressive Strength (psi)
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21,500
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15,500
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20,000
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26,700
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D695
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Compressive Modulus (psi)
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430,000
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340,000
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500,000
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1,000,000
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D785
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Hardness, Rockwell
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M95/R125
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M84
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M100/R126
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M85
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D256
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IZOD Impact Notched (ft-lb/in)
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0.6
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1.4
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1.0
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0.7
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PTM55007
(not ASTM)
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Coefficient of Friction, Dynamic
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0.4
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0.2
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0.4
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0.21
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PTM55007
(not ASTM)
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Limiting PV (psi-fpm)
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3,000
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8,750
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8,500
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35,000
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PTM55007
(not ASTM)
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"k" wear factor, (x 10-10 in3-min/lb-ft-hr)
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2,400
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62
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375
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100
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THERMAL
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D696
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Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
|
2.8
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3.3
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2.6
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1.7
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D648
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Heat Deflection Temp (°F / °C)
at 264 psi
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250 / 121
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240 / 115
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320 / 160
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383 / 195
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D3418
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Melting Temp (°F / °C)
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540 / 282
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536 / 280
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644 / 340
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644 / 340
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-
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Max Operating Temp (°F / °C)
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425 / 218
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430 / 221
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480 / 249
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482 / 250
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C177
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Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)
|
2.0
6.9
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2.1
7.2
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1.8
6.2
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1.7
5.9
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UL94
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Flammability Rating
|
V-0
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V-0
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V-0
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V-0
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ELECTRICAL
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D149
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Dielectric Strength (V/mil) short time, 1/8" thick
|
540
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500
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480
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-
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D150
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Dielectric Constant at 1 MHz
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3.0
|
-
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3.3
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-
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D150
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Dissipation Factor at 1 MHz
|
0.0013
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-
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0.003
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-
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D257
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Surface Resistivity (ohm-square) at 50% RH
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1013
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1013
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1013
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104
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