Air-Oil Separators

For AOS, choose Ashra.

Precision-cleaned air. Reduced oil loss.

Lower oil carryover, cleaner downstream air, and more efficient compressor performance across demanding industrial applications. Ashra’s air/oil separators remove oil aerosols from compressed air using coalescing micro-glass fiber layers, effective down to sub-micron levels.

Air-Oil Separators

For AOS, choose Ashra.

Precision-cleaned air. Reduced oil loss.

A legacy of AOS excellence.

In 1985, Ashra became the first in India to indigenize and introduce air/oil separators, supplying them to Ingersoll Rand, Bengaluru.

A legacy of AOS excellence.

In 1985, Ashra became the first in India to indigenize and introduce air/oil separators, supplying them to Ingersoll Rand, Bengaluru.
AOS products by Ashra:

Engineered to fit your operation realities

Different compressors and operating conditions demand different separation designs. Ashra offers multiple AOS
formats optimized for airflow, pressure drop, service life, and fitment across screw-type and sliding vane compressors.

Wrapped AOS

Designed for outside-to-inside flow, this style eliminates oil aerosols from compressed streams. Glass fiber...

Depth AOS

Built for higher oil aerosol loads in outside-to-inside flow and suitable for all versions of screw-type and sliding vane...

Pleated AOS

Pleating the filter media during manufacture increases surface area for improved separation and longer service...

Spin-on AOS

An economical, easy-to-maintain separator option for systems with lower line pressure and minimal surges...
Select the right AOS format

Products at a glance

AOS format
Best for
Flow direction
Key advantage
Why buyers choose it
Wrapped
Standard performance + consistent separation
Outside inside
Stable performance across applications
Reliable service life with strong oil aerosol removal
Depth
Higher oil aerosol load + compact design
Outside inside
Higher airflow capacity
Handles heavier conditions while maintaining low pressure drop
Pleated
Higher airflow demand + longer intervals
(Application-specific)
Increased surface area
Up to 2× airflow capacity vs. conventional wrapped designs
Spin-on
Low pressure systems + easy service
Inline head + cartridge
Quick replacement
Economical option with no special tooling

*Note: Compatible across screw-type and sliding vane compressors depending on application/fitment.

Reasons to Choose Ashra Air-Oil Separator Filters

Sub-micron level coalescence separation

Micro-glass fiber coalescing media reduces oil aerosols and vapors, keeping compressed air cleaner and oil loss under control.

Application-fit designs for real compressors

Wrapped, depth, pleated, and spin-on options support screw-type and sliding vane compressors so you don’t force-fit generic separators.

Optimized airflow with low pressure

Especially in depth and pleated variants, engineered for higher airflow capacity while maintaining low initial restriction.

Protection for downstream systems

Reduced oil carryover means cleaner air networks, improved efficiency, and reduced risk of contamination-related equipment issues.

Made with engineering control and validation

Manufactured with in-house expertise and supported by Ashra’s R&D and 40+ year filtration legacy, built to deliver consistent, repeatable performance.

Check Out Our Product Literature

Air-oil separator filters for Cummins

Air-oil separator elements exploit the phenomenon of coalescence, using micro-glass fibre layers to remove droplets of oil from the compressed air. This filtration process is effective right down to the sub-micron range, to keep oil consumption and oil entrainment into the compressed air networks to a minimum.

Ashra Air-Oil Separator Technology

Air Cleaner Options for Cummins engines

Air Cleaners suitable for
off-highway applications

Driven by real requirements,
from development to delivery.

Lab-validated performance

ISO/SAE tests for pressure, flow, capacity, and more.

Tested to the core

Exclusive media ensures efficiency and life.

Certified per relevant standards

Tests performed to meet global standards.

Customer-focused development

Start to end solutions

Ongoing innovation

Key products enhanced year on year

Trusted for durability

High capacity, longer service life.


Frequently Asked Questions on Ashra’s AOS

What is an air/oil separator (AOS) and why is it used?

An AOS removes oil aerosols and vapours from compressed air after compression. It helps reduce oil carryover into air networks, improves air cleanliness, and lowers compressor oil consumption.

Ashra AOS elements use coalescence, where oil droplets merge within micro-glass fibre media and separate from the compressed air stream, enabling fine separation down to sub-micron levels.

Ashra AOS filters are suitable for screw-type and sliding vane compressors, with multiple AOS variants designed to match different flow directions and operating requirements.

Low initial pressure drop reduces restriction in the compressor system, supporting better airflow efficiency and helping maintain stable system performance over the service life of the separator.
Selection depends on compressor type, flow rate, pressure conditions, aerosol load, and operating environment. Ashra can recommend the right AOS configuration based on your compressor model and application.

Want to know the right AOS for your compressor?

Share your compressor model and operating conditions to get the right AOS recommendation.

Place your next AOS
order online.

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