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Orings

Our orings are made from EPDM material and do not expand when in contact with the solvents in our First Contact Polymers. Other materials, even solvent-resistant Viton, can expand when in contact with solvents and may break their contact seal with the substrate or even create an upward bulge if fit tightly.

Why Use Orings When Cleaning Mounted Optics?

Orings create a "dam" to stop the polymer flow and avoid the liquid polymer from wicking under retainings and mounts. Click the Oring Tutorial link below to watch a our video on why coating an oring with First Contact Polymer before setting in place is so important! Click the Refractor Objective link to watch our video on how to install your oring when cleaning a refractor objective. Read our FAQs.

Oring Tutorial
FAQs
Refractor Objective

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Proven Results

Sequential progression First Contact cleaning BRDF test.
[LIGO / Caltech / MIT]

When your interferometer needs to measure movement thousands of times smaller than a proton, your system’s optical components must be completely free of contamination and residue in order to perform with unprecedented precision. Learn how First Contact outperforms traditional drag wipe cleaning methods, ensuring a pristinely clean, protected surface.

More on LIGO

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Orings - 3" to 3.875" (76.2 to 98.4mm) OD (Sold Individually) (Click to Select Size) Orings - 3" to 3.875" (76.2 to 98.4mm) OD (Sold Individually) (Click to Select Size)

Orings sized 3" to 3.875" Outside Dimension (OD). Use to stop First Contact Polymer from flowing on or under optics retaining rings. Measure the Inside Dimension (ID) of your retaining ring to select the correct oring size OD from the drop down menu. Orings 3" to 3 7/8" are sold individually.

Our Price: $3.50
Orings - 4" to 4.875" (101.6 to 123.8mm) OD (Sold Individually) (Click to Select Size) Orings - 4" to 4.875" (101.6 to 123.8mm) OD (Sold Individually) (Click to Select Size)

Orings sized 4" to 4.875" Outside Dimension (OD).  Use to stop First Contact Polymer from flowing on or under optics retaining rings.  Measure the Inside Dimension (ID) of your retaining ring to select the correct oring size OD from the drop down menu.  Orings from 4" to 4 7/8" are sold individually.

Our Price: $3.75
Orings - 1" to 1.875" (25.4 to 47.6mm) OD (Bag of 5) (Click to Select Size) Orings - 1" to 1.875" (25.4 to 47.6mm) OD (Bag of 5) (Click to Select Size)

Orings sized 1" to 1.875" Outside Dimension (OD). Use to stop First Contact Polymer from flowing on or under optics retaining rings. Measure the Inside Dimension (ID) of your retaining ring to select the correct oring size OD from the drop down menu. Orings 1" to 1 7/8" are sold in bags of 5.

Our Price: $4.75
Orings - 3/8" to 7/8" (9,5 - 22.2mm) OD (Bag of 5) (Click to Select Size) Orings - 3/8" to 7/8" (9,5 - 22.2mm) OD (Bag of 5) (Click to Select Size)

Orings sized 3/8" to 7/8" (.325" to .875") Outside Dimension (OD). Use to stop First Contact Polymer from flowing on or under optics retaining rings. Measure the Inside Dimension (ID) of your retaining ring to select the correct oring size OD from the drop down menu. Orings 3/8" to 7/8" are sold in bags of 5.

Our Price: $4.75
Orings - 2" to 2.875" (50.8 to 73.0mm) OD (Bag of 5) (Click to Select Size) Orings - 2" to 2.875" (50.8 to 73.0mm) OD (Bag of 5) (Click to Select Size)

Orings sized 2" to 2.875" Outside Dimension (OD). Use to stop First Contact Polymer from flowing on or under optics retaining rings. Measure the Inside Dimension (ID) of your retaining ring to select the correct oring size OD from the drop down menu. Orings 2" to 2 7/8" are sold in bags of 5.

Our Price: $5.25
Orings - Custom Size 5 To 10 Inch (127.0 to 254.0mm) OD (Sold Individually) Orings - Custom Size 5 To 10 Inch (127.0 to 254.0mm) OD (Sold Individually)

Orings are used to stop First Contact Polymer flow on or under optic retaining rings (or retaining flanges if retained from backside). We will manufacture a custom sized oring to fit your optic.

Measure the Inside Dimension (ID) of your retaining ring, mirror cell, etc. to select the correct oring size OD and enter the size in the space provided. Custom size orings are sold individually.

Our Price: $8.25
Orings - Custom Size 10 to 20 Inch (254.0 to 508.0mm) OD (Sold Individually) Orings - Custom Size 10 to 20 Inch (254.0 to 508.0mm) OD (Sold Individually)

Orings are used to stop First Contact Polymer flow on or under optic retaining rings (or retaining flanges if retained from backside). We will manufacture a custom sized oring to fit your optic.

Measure the Inside Dimension (ID) of your retaining ring, mirror cell, etc. to select the correct oring size OD and enter the size in the space provided. Custom orings are sold individually.

Our Price: $9.95
Oring Kit - 1" to 4.75" Oring Kit - 1" to 4.75"

An oring kit for someone with a wide variety of optics!  Contains a full range of orings from 1 inch to 4.75 inches, in 1/4 (one fourth) inch increments, and also a single edge razor and super glue to custom fit the orings if desired.

Our Price: $23.50
   
 

Shipping Restrictions
We cannot ship to P.O. boxes. We must have a physical address in order to ship First Contact Polymers.