PTFE Detailed Properties
2 Z' [2 E' J k+ Q' r6 E* y(Polytetrafluoroethylene)
, h( |& @) M1 j$ X2 pThe table below lists a generally accepted summary of properties that we believe to be reliable. Please note that many of these resins are produced in several varieties and property characteristics may vary. Therefore, determination of resin is dependent on the application and this table is only meant to serve as a general guideline. / S$ k( f3 A! c( F
+ G. Z9 l0 b3 C2 c; X: Z. W4 ?Properties ASTM or Unit PTFE
- D: c$ n" j9 |# |* o( w% Z: [MECHANICAL PROPERTIES
6 k8 g0 t0 I! v( ^/ nSpecific Gravity D792 2.18% p4 c9 I! I: H: G- k" n
Elongation % D638 200~450$ S; m6 j6 B& L' k/ J
Tensile Strength (psi) D638 2,000~4,500% W3 S4 h0 `. H2 ^
Flexural Strength (psi) D790 no break( b5 x- C- R/ S! \+ ` h# f
Compressive Strength(psi) D695 3,500(24MPa)( O+ b9 I* b; u3 N
Tensile Elastic Modulus : z* h1 }0 R+ R. b6 e; n
(Young's Modulus) (psi) D638 57,000# p) i3 z; t' g6 q
(psi)
* e4 L: @5 Z% x1 L2 IFlexural Modulus
6 V2 g7 t" Y/ ^( P# o+ `* w! z5 \- ?103MPa (103kgf/cm2) D790 71,000~
1 a7 ]# @; l, g( J85,000
c. R- j3 |. Y" W3 e, A- Y0 W D790 0.5-0.6. t1 z& u* y& W3 H: g
(5.0-6.0)
" l$ Q# l6 Y& EFlexLife3 B$ y; V; B0 ~/ o
(MIT cycles) D2176 >1,000,000
) j. b4 Q7 i& r: x' y" FHardness Durometer, e" G7 N* v# N% x
Shore D D636 D50~65
6 _# P8 r: R! H7 b2 y6 OCoefficient of Friction on steel 0.02
0 p- B4 G9 J1 r8 S: X7 oAbrasion Resistance
! E0 f4 [- i6 g. o, E4 ?1000 revs. Taber 12
Q W. g) `3 K2 Y/ ~Impact Strength IZOD) ]9 S/ u" j2 m& l
73°F/23°C, notched ft/lbs/in D256 3
7 u, Z- @8 I" M# i" g/ QTHERMAL PROPERTIES" \5 h2 e) p; o2 F
Melting Point °C+ X& L( B6 h4 t6 u
(°F) 327! L# N2 m) U" O, C- c; X3 _( J
(621)' B8 v- v+ ] p; y& b G; x
Upper Service6 W. ?* L+ G) H
Temperature(20,000h) °C
( I- N; q$ |* D: g9 ^! V(°F) 260
8 W' T; |: A6 B(500)7 E* \' @; I5 c1 b6 ]) x
Flame Rating** UL 94 V-09 B/ E8 q) t' Y" L5 S
1 T( M# K2 W' G3 Z7 T6 GThermal Conductivity1 w- j2 K6 O& h3 \7 n2 O
BTU/hr/ft2/deg F in 1.78 I& c* u) w8 E4 \1 Q
cal/sec/cm2,ºC/cm 6 x 10-4+ S2 x4 s4 X2 r* i- k! n" V9 p
Linear Coefficient of Thermal Expansion 10-5 °C D696 >11.6
6 I! O9 }- q! Z& {. y' D: h$ j' uHeat of Fusion BTU/LB 29-37
- m) n" {, a" u+ t: g) r0 M& b. gHeat of Combustion BTU/LB 2200# `, n) G" ^! v6 ~" E2 \
Low Temperature Embrittlement °C
( v$ Q4 R L' y# {. H(°F) -268
& p: D" B- d. q5 x4 q(-450)
$ ?% j$ B% r, `$ _. ]0 h, W5 BELECTRICAL PROPERTIES
5 k' v* B' Q. U! p+ X2 x* [Dielectric Constant D150/103Hz 2.1
8 F! |; E" x% o7 Q. m9 | D150/106Hz 2.1
: o) e) g6 Q& ^+ oDielectric Strength2 ^* x1 Y3 @* V9 y0 B) j
10 mil film D149 >1400* V) N3 y0 R3 }- R) @: F$ o
Volume Resistivity ohm-cm D257 >1018
% t P3 o- T. k6 N& DSurface Resistivity/ x9 {2 L5 N* P! v* P. g
ohm/sq. D257 >1017
+ s! G6 V) Y6 S* g% j" F7 l& X+ }3 iGENERAL PROPERTIES
4 ?5 p% P1 \* l ]5 ]9 \Chemical/Solvent
+ ~' l, j0 \+ V7 ?* }! FResistance D543 Excellent
$ H( A' ~0 R T, pWater Absorption, 24h % <0.01
% E% f7 h# Z- |Deformation Under Load *D621/100°C 5.03 y5 P+ l3 d# E# \# `
**D621/25°C 7.0' q; H. Y3 W, t; ]. s6 p# X+ _
Refractive Index 1.354 w8 @" o7 ?( t9 ]/ N9 w/ |# L
Limiting Oxygen Index >95 >95. Y( ? \6 r4 a( t( K1 g/ p
Properties ASTM or Unit PTFE
/ B" V: |2 W: l' z7 N7 w) _( q*6.8 MPa (986 psi),24h# @* r4 `7 ]2 V) T% d$ h
**13.7 MPa (1987 psi),24h
8 H; U- C+ F! s8 w% f7 E
& ?, B( Z3 A( `( ^( |2 H物理性能:聚四氟乙烯塑料表面光滑,蜡状,极梳水。一般为乳白色不透明。但淬火制品具有一定的透明性。平均密度为2.2。
U$ M, d* G) d+ D+ S e" j力学性能:抗拉强度20.0~30.0MPa,断裂伸长率300%~400%。弹性模量400 Mpa。表面硬度大约为55-70HS。PTFE之间的摩擦系数大约为0.1-0.2。/ y8 g# L% K g# z
化学性能:能耐绝大部分强腐蚀性物质,至今尚无一种能在300℃以下溶解它的溶剂。耐候性强。可存放10年以上。 |