Installing Teflon® Encapsulated O-Rings
1. Surface Preparation
a. Clean the groove or sealing surface.
b. Groove must be smooth, devoid of sharp edges, burrs, or deep scratches.
c. Recommended surface finish: 32 micro-inches or better
2. Heating the O-Ring for Difficult installations
a. Heat the Teflon® encapsulated o-ring to soften the Teflon® encapsulation surrounding the elastomer core for ease of installation and mitigating the risk of damage.
b. Immerse encapsulated o-ring in boiling water, use a heat gun, or a hot air oven.
c. Heat to temperature range: 150°C – 250°F (65°C – 121°C).
3. Stretching a Teflon® encapsulated o-ring for Difficult Installations
a. Stretch the O-ring to fit the area.
b. Avoid overstretching to prevent damage to the Teflon® encapsulation.
c. Maximum stretch limit: 8% for silicone and 6% for Viton® FKM O-rings.
4. O-Ring Installation:
a. Place the stretched Teflon® encapsulated o-ring into the groove or on the sealing surface.
b. Make sure the encapsulated o-ring is properly installed without twists or pinches.
5. Cooling
a. Allow the encapsulated o-ring to cool to room temperature.
6. Lubrication:
a. Apply a light lubricant such as silicone or fluorinated grease to minimize wear.
7. Inspection:
a. Examine the Teflon® encapsulated o-ring for any damage, such as cuts,gouges,dents,etc.
Note: Teflon® encapsulated o-rings require approximately 20% compression of cross section to ensure an effective seal.
Groove should be rectangular shaped and adhere to standard dimensions as outlined in the Parker O-ring Handbook
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