Technical Bulletin

TB-106: Sealing Options for EPC Encoders

Encoder Products Company uses the international standard IP Code, International Protection Marking, IEC standard 605291, for specifying the sealing qualities of our units. The chart below explains what the different numerical designations define. Note that the designations build on the previous ones; that is, an IP69K rating means that unit is also protected against everything that a unit rated IP68, IP67, IP66, etc., is protected against.

EPC encoders offer the following sealing designations on our encoders:

IP50: Unit is not entirely protected from ingress of dust, but not enough dust can enter the unit to interfere with the unit’s function. Unit is not protected from water/moisture.

All IP designations of IP60 or higher are protected completely against dust ingress; i.e., “dust-tight”.

IP64: Dust-tight. Protected against water sprays from all directions, with limited ingress permitted.

IP65: Dust-tight. Protected against low-pressure jets of water in all directions, with limited ingress permitted.

IP66: Dust-tight. Protected against strong-pressure jets of water in all directions, with limited ingress permitted.

IP67: Dust-tight. Protected against water immersion between 15 cm and 1 m for a duration of 30 minutes.

IP69K: Dust-tight. Protected against continuous immersion in water, and protected against close-range, high pressure, high temperature spray downs.


1See for testing standards.



Download the PDF

TB-106 Sealing Options for EPC Encoders


Contact EPC

For help determining which IP rating is right for the encoder in your application, please contact EPC Technical Services at 800-366-5412 or email


TB-106 Rev D, 01/30/2018