3A Sanitary & E3A O-rings & Seals

3A Sanitary & E3A O-ring & Seal Materials:

3-A Sanitary Standards have been formulated by the United States Public Health Service, the International Association of Milk Food and Environmental Standards, and the Dairy and Food Industries Supply Association. A similar document, E-3A Sanitary Standards, was later formulated by this same group plus the United States Department of Agriculture and the Institute of American Poultry Industries.

The 3-A standards are intended for elastomers to be used as product contact surfaces in dairy equipment.

E-3A standards are intended for elastomers used as product contact surfaces in egg processing equipment.

The requirements of the two specifications are essentially identical, the intent in each case being to determine whether rubber materials are capable of being cleaned and receiving an effective bactericidal treatment while still maintaining their physical properties after repeated applications of the cleaning process chemicals.


3A & E3A Ethylene Propylene (EPDM) Compounds:

Brand Compound Number Datasheet Hardness (Shore A) Class Color
Engineered Seal Products ESP-E8061 PDF 75 +- 5 3 Black
Parker E1028-70 PDF 70 +- 5 Not Tested Black
Freudenberg 70 EPDM 291 PDF 70 +- 5 2 Black
Freudenberg 85 EPDM 292 PDF 85 +- 5 2 Black
Freudenberg 70 EPDM 253815 PDF 70 +- 5 2 White
Freudenberg 70 EPDM 331 PDF 70 +- 5 2 Black
Freudenberg 70 EPDM 335 PDF 70 +- 5 2 Black

3A & E3A Fluorocarbon (FKM) Compounds:

Brand Compound Number Datasheet Hardness (Shore A) Class Color
Parker V0680-70 PDF 70 +- 5 1,2,3,4 Red
Freudenberg 75 FKM 180497 PDF 75 +- 5 1 Black
Freudenberg 75 FKM 37508 PDF 70 +- 5 1 Red

3A & E3A Nitrile (NBR) Compounds:

Brand Compound Number Datasheet Hardness (Shore A) Class Color
Engineered Seal Products ESP-N8018 PDF 70 +- 5 2 Black
Parker N1069-70 PDF 70 +- 5 Not Tested Black
Parker N1219-60 PDF 60 +- 5 Not Tested Black
Parker N1220-70 PDF 70 +- 5 Not Tested Black
Parker N0508-75 PDF 75 +- 5 1, 2, 3, 4 Black
Freudenberg 70 NBR 438 70 +- 5 2 Black
Freudenberg 85 NBR 436 88 +- 5 2 Black

3A & E3A Hydrogenated Nitrile (HNBR) Compounds:

Brand Compound Number Datasheet Hardness (Shore A) Class Color
Freudenberg 75 HNBR 231142 PDF 75 +- 5 1 Black

3A & E3A Silicone (VMQ) Compounds:

Brand Compound Number Datasheet Hardness (Shore A) Class Color
Engineered Seal Products ESP-S8000 PDF 70 +- 5 4 Rust
Freudenberg 75 VMQ 176643 76 +- 5 1 Red
Freudenberg 70 VMQ 117055 70 +- 5 1 Transparent