3A O-Rings for use in Dairy Equipment Seals
USDA 3-A Sanitary Rubber Gaskets Safe for Dairy Contact


Marco Rubber manufactures 3A O-rings, 3A EPDM, 3A Kalrez® FFKM Markez®, Viton®, Sanitary Clamp Gaskets Hygienic Seals and custom components in accordance with 3-A Standard 18-03 “3-A Sanitary Standards for multiple-use rubber and rubber-like materials used as product contact surfaces in dairy equipment”, defining requirements for food quality materials that must also be suitable for cleaning and sanitizing solutions.

Formed by the US food and Dairy industry, 3A Sanitary Standards Inc. defines specifications and best practice for the design, manufacture, installation and use of hygienic equipment. As with FDA, the 3-A standards are adopted on a worldwide basis.

Marco Rubber elastomers meeting the UDSA 3-A standard include 3A EPDM, 3A Kalrez® FFKM Markez®, Viton® allowing equipment manufacturers/users to select the most appropriate elastomer to temperature, chemical and physical performance criteria. An additional requirement some of our 3A O-Rings and materials meet is free from animal derived ingredients (ADI-free).

O-Rings Stacked Colors

Popular Compounds

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Peroxide cured EPDM, Different Durometer , KTW, WRAS standards available
Wide range of compliance
Wide range of compliance
Formulated for Chloramine Resistance. Can be manufactured in custom shapes with minimal setup charge.
Available in many durometers and colors
Available in many durometers and colors
KTW, WRAS and other standards available.
Metal detectable for contamination detection sensors(additional colors available)
Available in many durometers and colors
S1020VMQ70Clear Translucent-75400checkmark
Clear Translucent, available in many durometer and color choices.
S1037VMQ70Clear Translucent-75400checkmarkcheckmark
Clean room manufactured, platinum cured (specific base materials and cleanroom packaging options available)
S1083VMQ70Clear Translucent-65400checkmarkcheckmark
Commercial manufactured, platinum cured (cleanroom manufacturing and packaging options available)
Cleanroom manufactured, Lower cost than clear
Cleanroom manufacturing and packaging options available
Steam Resistant Terpolymer, Also available in black
Metal detectable for contamination detection(additional colors available)
FDA compliant, higher temperature resistance, wide chemical compatibility. Compare to Kalrez® 6230, Kalrez® LS222
Low cost performance value, nearly universal chemical compatibility, acid, amines, solvents, compression set resistance, FDA compliant and USP Class VI medical grade. Compare to Kalrez® 6230, Kalrez® LS222
USP Class VI and FDA compliant white FFKM with wide range compatibility. Compare to Kalrez® 6221, Kalrez® LS205, Chemraz® 625

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FDA compliance per 21 CFR 177.2600 parts A-D, E&F approved compounds available upon request. **USP <87> and USP <88> approved compounds available upon request.
The temperature ranges presented above are approximations for dry air service only and should not be used to determine design specifications or end-use temperature limits. Actual temperature range of a compound in an end-use application is highly dependent on part type, hardware configuration, applied forces, chemical media, pressure and thermal cycling effects, and other factors. The most practical way of determining an end-use temperature range is testing in the actual application conditions. Consult a Marco Engineer for more details.