FEP Tubing (Fluorinated Ethylene Propylene)

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FEP Tubing (Fluorinated Ethylene Propylene) is the preferred material in production of small diameter tubing of continuous lengths. While some temperature resistance is sacrificed with FEP (to 400º F), its chemical and dielectric properties are similar to those of PTFE. FEP tubing is a clear tubing that is an economical choice for applications requiring chemical resistance and a broad temperature exposure. FEP Tubing offers excellent clarity which makes it ideal for sight glass/flow monitoring applications. FEP Tubing has a slightly higher coefficient of friction, lower continuous service temperature, and is more transparent then PTFE. FEP Tubing also has better gas and vapor permeability properties and excellent UV transmission ratings.

FEP Tubing comes in a wide range of standard sizes and custom sizes are available upon request. FEP Tubing is also available in coiled tubing that can be ordered in various sizes, lengths, special sizes and colors to meet your needs.

FEP Tubing Offers:

  • Chemically inert to most industrial chemicals and solvents
  • Non-flammable
  • Available in coiled, convoluted and heat-shrink construction
  • High thermal stability

FEP Tubing Applications:
Aerospace &Transportation Technology, Electronics, Components & Insulators, Chemical & Pharmaceutical Manufacturing, Food Processing, Environmental Sciences, Air Sampling, Fluid Transfer Devices and Water Processing Systems

FEP Fractional Sizes

O.D.
(in)
I.D.
(in)
Wall
(in)
Nominal
O.D. (in)
O.D.
Tolerance
(in)
Wall
Tolerance
(in)
Working
Pressure*
PSIG(bar)
Burst
Pressure+
PSIG(bar)
Minimum
Bend
Radius(in)
3/32 1/32 0.031 0.094 +/- 0.004 +/- 0.003 480 (33) 2400(165) 1/2
1/8 1/16 0.031 0.125 +/- 0.004 +/- 0.003 360 (25) 1800 (124) 1/2
5/32 3/32 0.031 0.157 +/- 0.005 +/- 0.003 282 (19) 1412 (97) 1/2
3/16 1/8 0.031 0.188 +/- 0.005 +/- 0.003 231 (16) 1154 (80) 1/2
3/16 1/16 0.062 0.188 +/- 0.005 +/- 0.003 480 (33) 2400 (165) 1/2
1/4 3/16 0.031 0.250 +/- 0.005 +/- 0.003 168 (11.6) 840 (58) 1
1/4 5/32 0.047 0.250 +/- 0.005 +/- 0.003 263 (18) 1315 (91) 3/4
1/4 1/8 0.062 0.250 +/- 0.005 +/- 0.003 360 (24.8) 1800 (124) 1/2
5/16 1/4 0.031 0.313 +/- 0.005 +/- 0.003 132 (9.1) 359 (24.8) 3/4
5/16 3/16 0.062 0.313 +/- 0.005 +/- 0.003 282 (19.4) 1412 (97.4) 1/2
3/8 5/16 0.031 0.375 +/- 0.005 +/- 0.003 109 (7.5) 541 (37.3) 2-1/2
3/8 1/4 0.062 0.375 +/- 0.005 +/- 0.003 231 (15.9) 1154 (79.6) 1
7/16 3/8 0.031 0.438 +/- 0.005 +/- 0.003 92 (6.3) 459 (31.6) 8
7/16 5/16 0.062 0.438 +/- 0.005 +/- 0.003 195 (13.4) 973 (67.1) 12
1/2 7/16 0.031 0.500 +/- 0.006 +/- 0.003 80 (5.5) 398 (27.4) 4
1/2 3/8 0.062 0.500 +/- 0.006 +/- 0.003 168 (11.6) 840 (57.9) 2
9/16 1/2 0.031 0.562 +/- 0.006 +/- 0.003 70.3 (4.8) 352 (24.3) 4-1/2
5/8 9/16 0.031 0.625 +/- 0.006 +/- 0.003 63 (4.3) 315 (21.7) 5-1/2
5/8 1/2 0.062 0.625 +/- 0.006 +/- 0.003 132 (9.1) 659 (45.4) 3
11/16 5/8 0.031 0.688 +/- 0.006 +/- 0.003 57 (3.9) 285 (19.7) 4
3/4 11/16 0.031 0.750 +/- 0.006 +/- 0.003 52 (3.6) 260 (17.9) 8
3/4 5/8 0.062 0.750 +/- 0.006 +/- 0.003 108 (7.4) 541 (37.3) 6
7/8 3/4 0.062 0.875 +/- 0.007 +/- 0.003 92 (6.3) 459 (31.6) 12
1 7/8 0.062 1.000 +/- 0.010 +/- 0.003 80 (5.5) 398 (27.4) 16
1.1 1 0.040 1.100 +/- 0.010 +/- 0.004 57 (3.9) 285 (19.7)  
1-1/8 1 0.062 1.125 +/- 0.015 +/- 0.003 70 (4.8) 352 (24.3)  
1-1/4 1-1/8 0.062 1.250 +/- 0.015 +/- 0.004 63 (4.3) 315 (21.7)  
1-3/8 1-1/4 0.040 1.375 +/- 0.015 +/- 0.004 57 (3.9) 285 (19.7)  

FEP Metric Sizes

O.D.
(mm)
I.D.
(mm)
O.D./I.D.
Tolerance
(mm)
O.D.
(in)
I.D.
(in)
O.D./I.D.
Tolerance
(in)
Working
Pressure*
PSIG(bar)
Burst
Pressure+
PSIG(bar)
Minimum
Bend
Radius(in)
4 2 +/- 0.11 0.157 0.078 +/- 0.004 360 (25) 1800 (124) 1/2
5 3 +/- 0.11 0.197 0.118 +/- 0.004 282 (19) 1412 (97.4) 1/2
6 4 +/- 0.13 0.236 0.157 +/- 0.005 231 (16) 1154 (79.6) 1/2
7 5 +/- 0.13 0.276 0.197 +/- 0.005 195 (13) 973 (67.1) 1-3/4
8 6 +/- 0.13 0.315 0.236 +/- 0.005 168 (11.6) 840 (57.9) 1-3/4
9 7 +/- 0.13 0.354 0.276 +/- 0.005 148 (10.2) 738 (50.9) 2-1/2
10 8 +/- 0.13 0.393 0.315 +/- 0.005 132 (9.1) 659 (45.4) 2-1/2
12 10 +/- 0.15 0.472 0.393 +/- 0.006 108 (7.4) 541 (37.3) 3-1/2
14 12 +/- 0.15 0.551 0.472 +/- 0.006 92 (6.3) 459 (31.6) 4
16 14 +/- 0.15 0.63 0.551 +/- 0.006 80 (5.5) 398 (27.4) 5-1/2

*This tubing has a safety factor of 5 to 1 (ratio of burst pressure to working pressure). This data is to be used as a guildeline only. You should perform actual tests according to your specific application.
+The following equation is for calculating burst pressure. The result from this equation is to be used as a guideline only. The calculation is at ambient room temperature. It does not factor steam pressure, altitude, etc.

B=T(O.D.2 - I.D.2)
     O.D.2 + I.D.2

B=Burst Pressure
T=Tensile Strength Values: FEP-3000 psi    PFA - 4000 psi    PTFE - 2500 psi     PVDF - 5000 psi     ETFE=6500 psi
1 bar = 14.504 psi