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Row Inc Singapore
  • FEP/PFA Encapsulated O-Rings

    TFE-O-SIL silicone, Viton® or EPDM O-Rings encapsulated with FEP or PFA are designed to address the growing problem of sealing in the most hostile chemical and temperature environments. TFE-O-SIL combines the best qualities of two materials, FEP or PFA on the outside with its chemical inertness and an elastomer on the inside for resilience. This unique combination forms a highly effective, long lasting seal for the most demanding applications.

    TFE-O-SIL O-Rings are available in over 60 standard cross section sizes from .063″ (1.60mm) to 1-1/4″ (31.75mm). Standard TFE-O-SIL O-Rings are comprised of FEP over silicone, Viton®, or EPDM, and can be used in temperatures from -75° to +400°F (-60° to +205°C) depending upon the choice of elastomer core.

    For high temperature applications to 500°F (260°C), TFE-O-SIL is made with PFA over silicone. PFA has higher mechanical strength than FEP or TFE at elevated temperatures and has excellent crack and stress resistance.

    Encapsulated O-Rings are primarily used as a static seal (axial or radial).

    Standard TFE-O-SIL O-Rings in round or square cross-sections are manufactured in sizes to AS 568A industry standards. Non-standard sizes are also available for custom designs, along with a full range of metric (ISO) sizes.

    FEP-encapsulated O-Rings (Fluorinated Ethylene Propylene):

    • Outstanding chemical and corrosion resistance
    • Low coefficient of friction
    • Resilience with choice of elastomeric cores
    • Low compression set
    • Temperature range: -75°F to 400°F (-60°C to 205°C)
    • Unlimited sizes (No tooling charges)
    • Solid & hollow silicone, Viton® cores
    • FDA compliant materials available
    • USP Class VI approved materials available

    PFA-encapsulated O-Rings (Perfluoroalkoxy). Same as FEP but with these added benefits:

    • High temperature applications to 500°F (260°C)
    • Higher mechanical strength
    • Better flex-life
    • Low vapor permeation
    • Excellent stress and crack resistance
    • Longer wearability
    • Solid silicone & Viton® core
  • FEP Encapsulated Gaskets

    Typical Applications

    TFE-O-SIL Gaskets provide a superior seal for any bulk liquid transfer in manufacturing, distribution or storage.

    Chemical Processing:

    • From trucks to storage
    • From storage to process areas

    Cosmetic Industry:

    • Transferring perfumes and oils
    • Blending and batching oils and greases for soap

    Petroleum Industry:

    • Deliveries to service stations
    • Oil canning
    • Blending grease and oil
    • Mixing oil additives

    Paints & Dyes:

    • Mixing color pigments

    Pharmaceuticals:

    • Blending raw materials

    Rubber & Plastics:

    • Blending liquids and resins

    Printing & Marking Equipment:

    • Hose connectors

    Bulk Liquid Transfer:

    • Mining slurries, agricultural chemicals, brewing
  • FEP or PFA encapsulated straight lengths in Silicone, Viton®, or EPDM

    The straight lengths can be supplied with “open ends” or “closed ends” providing total encapsulation of the elastomer.

    ROW also has the ability to supply NON-ENCAPSULATED O-Rings

    • No tooling charges
    • Quick turnaround
    • Non-standard sizes
    • Large cross sections (.275″ I.D. and above)
    • Large diameters
    • Choice of elastomers:
      • Platinum cured silicone – USP Class VI approved (white or red)
      • Silicone – FDA compliant (white or red)
      • EPDM – FDA compliant and USP Class VI approved
      • Viton® – FDA compliant and USP Class VI approved
  • Why ROW

    NOT ALL ENCAPSULATED O-RINGS ARE OF EQUAL QUALITY AND PERFORMANCE ABILITIES EVEN THOUGH THEY MAY LOOK ALIKE!

    FACT 1: Most manufacturers of encapsulated O-Rings use CYANOACRYLATE (quick glue) to join the ends of the Viton cord instead of vulcanizing with a fully curable fluorocarbon based adhesive. The glued joint is inferior to a vulcanized joint at elevated temperatures.

    PROBLEM A:

    Introducing a foreign material, cyanoacrylate, may cause contamination thru permeation of the FEP or PFA jacket.

    PROBLEM B:

    Certain chemicals, thru permeation, will attack and break down the glue, causing premature seal failure.

    PROBLEM C:

    The quick glue bond is dramatically weakened during a rise in temperature and breaks down completely nearing 400°F; whereby the elastomer shrinks and the joint separates leaving a gap between the ends of the Viton cord.

    PROBLEM D:

    When heating and stretching a glued O-Ring to fit over a shaft, the bond may break.

    SOLUTION

    Insist on ROW, Inc. TFE-O-SIL® vulcanized encapsulated O-Rings! Ask your supplier what method they use to join the ends of their Viton encapsulated O-Rings…or simply run your own test by placing the O-Ring in an oven at 350°F for only 15 minutes. It will be clearly visible that the splice has completely separated, creating a gap or potential leak path.

    FACT 2: Occasionally, encapsulated O-Rings will exhibit an AIR GAP of .005″ – .010″ between the elastomer core and the jacket.

    PROBLEM A:

    The air gap allows considerably more compression set and reduces the resilience of the encapsulated O-Ring, resulting in premature leakage.

    SOLUTION

    Run compression tests to compare TFE-O-SIL encapsulated O-Rings with other supplier O-Rings…or specify ROW TFE-O-SIL O-Rings which have no air gap.

  • Technical Specifications

    FEP (Fluorinated Ethylene Propylene)

    • Clear
    • Upper temperature limit: 400°F (204°C)
    • Excellent chemical and corrosion resistance
    • Will not absorb moisture
    • Excellent resilience
    • Smooth/self-lubricating surface
    • FDA Compliant
    • USP Class VI approved

    PFA (Perfluoroalkoxy)

    • Clear with light blue tint
    • Upper temperature limit: 500°F (260°C)
    • Excellent heat and chemical resistance
    • Better crack and stress resistance than FEP
    • Extremely smooth surface
    • Low vapor permeation
    • FDA Compliant
    • USP Class VI approved
  • Length Conversion Chart

    Note: All decimal equivalents are rounded to the fourth.

    Inch
    (/)
    Inch
    (.)
    mm Inch
    (/)
    Inch
    (.)
    mm Inch
    (/)
    Inch
    (.)
    mm Inch
    (/)
    Inch
    (.)
    mm
    .063±.004 .0156 0.3969 17/64 .2656 6.7469 33/64 .5156 13.0969 49/64 .7656 19.4469
    1/32 .0313 0.7938 9/32 .2819 7.1438 17/32 .5313 13.4938 25/32 .7813 19.8438
    3/64 .0469 1.1906 19/64 .2968 7.5406 33/64 .5469 13.8906 51/64 .7969 20.2406
    1/16 .0625 1.5875 5/16 .3125 7.9375 9/16 .5625 14.2875 13/16 .8125 20.6375
    5/64 .0781 1.9844 21/64 .3281 8.3344 37/64 .5781 14.6844 53/64 .8281 21.0344
    3/32 .0938 2.3813 11/32 .3438 8.7313 19/32 .5938 15.0813 27/32 .8438 21.4313
    7/64 .1094 2.7781 23/64 .3594 9.1281 39/64 .6094 15.4781 55/64 .8594 21.8281
    1/8 .1250 3.1750 3/8 .3750 9.5250 5/8 .6250 15.8750 7/8 .8750 22.2250
    9/64 .1406 3.5719 25/64 .3906 9.9219 41/64 .6406 16.2719 57/64 .8906 22.6219
    5/32 .1563 3.9688 13/32 .4063 10.3188 21/32 .6563 16.6688 29/32 .9063 23.0188
    11/64 .1719 4.3656 27/64 .4219 10.7156 43/64 .6719 17.0656 59/64 .9219 23.4156
    3/16 .1875 4.7625 7/16 .4375 11.1125 11/16 .6875 17.4625 15/16 .9375 23.8125
    13/64 .2031 5.1594 29/64 .4531 11.5094 45/64 .7031 17.8594 61/64 .9531 24.2094
    7/32 .2188 5.5563 15/32 .4688 11.9063 23/32 .7188 18.2563 31/32 .9688 24.6063
    15/64 .2344 5.9531 31/64 .4844 12.3031 47/64 .7344 18.6531 63/64 .9844 25.0031
    1/4 .2500 6.3500 1/2 .5000 12.7000 3/4 .7500 19.0500 1 1.0000 25.4000

Cross Section and Groove Design
Installation Instructions
Small I.D. Encapsulated O-Ring “Ovality” Design Tip

Available Cross Sections for Encapsulated O-Rings and Groove Design Data

CROSS SECTIONS (A)
Inch
CROSS SECTIONS (A)
MM
(D)
Groove Depth
(W)
Groove Width
FEP/PFA
Wall Thickness
.063±.004 1.60±0.10 .046 .087 .010
.070±.004 1.78±0.10 .049 .100 .010
.079±.004 2.00±0.10 .057 .111 .010
.094±.004 2.40±0.10 .069 .127 .010
.098±.004 2.50±0.10 .074 .132 .010
.103±.004 2.62±0.10 .078 .137 .010
.118±.004 3.00±0.10 .088 .157 .010
.122±.004 3.10±0.10 .092 .161 .010
.125±.004 3.20±0.10 .095 .164 .010
.134±.005 3.40±0.13 .104 .174 .010
.139±.005 3.53±0.13 .108 .178 .012
.150±.006 3.80±0.15 .118 .191 .012
.157±.006 4.00±0.15 .125 .201 .012
.170±.006 4.30±0.15 .135 .217 .015
.177±.006 4.50±0.15 .140 .226 .015
.187±.006 4.75±0.15 .147 .238 .015
.197±.006 5.00±0.15 .157 .248 .015
.210±.006 5.33±0.15 .165 .267 .015
.217±.007 5.50±0.18 .172 .276 .015
.225±.007 5.70±0.18 .178 .284 .015
.236±.007 6.00±0.18 .190 .296 .015
.250±.008 6.35±0.20 .200 .313 .020
.275±.008 7.00±0.20 .225 .338 .020
.295±.012 7.50±0.30 .240 .364 .020
.315±.015 8.00±0.38 .257 .390 .020
.331±.015 8.40±0.38 .267 .410 .020
.354±.020 9.00±0.30 .290 .434 .020
.375±.020 9.53±0.38 .306 .460 .020
.394±.020 10.00±0.51 .322 .484 .020
.437±.020 11.10±0.51 .355 .530 .030
.472±.020 12.00±0.51 .393 .571 .030
.500±.020 12.70±0.51 .401 .620 .030
.562±.025 14.30±0.64 .450 .689 .030
.591±.025 15.00±0.64 .466 .736 .030
.625±.025 15.90±0.64 .500 .770 .030
.708±.025 18.00±0.64 .565 .900 .030
.750±.025 19.00±0.64 .580 .970 .030
.787±.025 20.00±0.64 .600 1.032 .030
1.000±.035 25.40±0.89 .757 1.270 .045*
1.250±.050 31.75±1.27 .940 1.585 .045*

*PFA / Silicone Only

Cross Section Tolerances

Cross Section Tolerance
Round C.S.
Tolerance
Square C.S.
.063″ – .125″ ±.004″ ±.006″
.126″ – .139″ ±.005″ ±.008″
.140″ – .210″ ±.006″ ±.010″
.211″ – .275″ ±.007″ ±.012″
.276″ – .312″ ±.012″ ±.015″
.313″ – .350″ ±.015″ ±.020″
.351″ – .500″ ±.020″ ±.030″
.501″ – .787″ ±.025″ ±.035″
.788″ – .1.000″ ±.035″ ±.050″
1.001″ – 1.250″ ±.050″ ±N/A

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Cross Section and Groove Design
Installation Instructions
Small I.D. Encapsulated O-Ring “Ovality” Design Tip

Instructions for Installing TFE-O-SIL O-Rings

Any surface in direct contact with the O-Ring should be smooth and free from sharp edges, burrs and deep scratches. A 20 micro-inch finish is recommended.

If it is difficult to install the O-Ring over a shaft, it may be “stretched” by first immersing the O-Ring in boiling water for a few minutes. This softens and enlarges the O-Ring. After installation, it may be necessary to apply heat to the O-Ring once again so it will shrink back to a tight fit when cooled.

Do not bend the O-Ring too sharply as the Teflon will tend to kink under the strain, however, if it does become kinked, it will not affect the operation in most applications.

Sealing with Teflon encapsulated O-Rings is sometimes a little different than sealing with rubber O-Rings. A rubber O-Ring will readily flow into imperfections of sealing surfaces. Teflon, being harder, takes time to flow into imperfections. The O-Ring may leak on initial start-up. To correct this situation if it occurs after installing the O-Ring, allow it to rest in place under load for a few hours or overnight. This allows the Teflon to coldflow and fill voids for proper sealing on start-up. Another method is to install a pre-heated O-Ring, and allow to cool under load. The heated O-Ring is softer and flows quicker into imperfections.

CAUTION

Within normal use temperatures, Teflon is attacked by so few chemicals that it is easier to describe the exceptions rather than list the chemicals with which Teflon is compatible. Teflon should not be used with the following:

1. Alkali metals such as elemental sodium, potassium, lithium, etc. These alkali metals remove fluorine from the polymer molecule.

2. Extremely potent oxidizers, fluorine (F2) and related compounds (e.g., chlorine trifluoride, CIF3). These can be handled by Teflon, but only with great care, as fluorine is absorbed into the resins, and the mixture becomes sensitive to a source of ignition such as impact.

3. 80% NaOH or KOH, metal hydrides such as borances (e.g., B2H6), aluminum chloride, ammonia (NH3), certain amines (R-NH2) and imines (R-NH) and 70% nitric acid at temperatures near the suggested service limit.

Design and engineering assistance is available from TFE-O-SIL at no charge. However, any selection or application suggestions offered by TFE-O-SIL, are only to assist the customer…and in ALL CASES, determination of fitness for purpose or use is solely the customer’s responsibility.

Hints for Inserting Coupling Gasket

Teflon encapsulated coupling gaskets are more rigid than plain elastromeric gaskets due to the Teflon encapsulation and are therefore a little more difficult to insert. After installing just a few, you will be an expert.

Insert gasket perpendicular to opening with OD of gasket 90° from the locking arm holes to prevent damage to Teflon. Tip gasket and insert lower part of gasket into groove directly under 1 locking arm hole. Cover the other locking arm hole with a thin flat object such as a 6″ stainless steel pocket rule and work balance of gasket, starting from the part already in the groove, past the covered locking arm hole and into the groove.

Teflon encapsulated coupling gaskets are far superior to other gasket materials when used in corrosive applications.

×

Cross Section and Groove Design
Installation Instructions
Small I.D. Encapsulated O-Ring “Ovality” Design Tip

When you take a straight length of elastomer cord and FEP or PFA tubing, and form it into the shape of an o-ring, the mechanical stresses placed upon the elastomer dictates that the cross section will not remain ROUND, but become OVAL.

This is particularly relevant on encapsulated o-rings with small inside diameters on all cross sections; but especially on large cross sections. (Standard elastomeric o-rings are molded; therefore this condition is not present).

The o-ring cross section will become oval with an enlargement of the axial cross section; and a reduction in the cross section to the radial axis. (see diagram A) Without knowing the intended application (axial or radial seal), the only method that can be used to determine the correct dimension, is to apply the average cross section measurement from the axial AND the radial axis. The average of these 2 figures is used to determine if the o-ring is within manufacturing standards.



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