Ester & Ether – The Polyurethan Sisters

A common question when it comes to polyurethane tubing, is the difference between the two polyurethanes: ester-based and ether-based.

For the chemists in the crowd, ether has two carbons bonded to an oxygen atom. Ester however has a double oxygen bond with a carbon atom.

Practically speaking, there’s a trade-off to be made by the user. The ester-based resin handles oil slightly better but it degrades quickly when introduced to moisture. The ether-based resin handles oil slightly less well, and handles water very well. In fact, ether-based polyurethane is an excellent choice for water applications.

To me, the ether-based resin is an easy choice. The ester though is a little cheaper and is the material you often see in inexpensive imported tubing. In fact, if you see polyurethane tubing for sale at a discount house and are marveling at the low price, you’re most certainly looking at ester-based material. You won’t be able to tell the difference until it gets wet.


6 Traits of Non-Spill: How quick disconnect couplings evolved for low-pressure fluid handling

Once the domain of high-pressure hydraulics, non-spill performance is now available in quick disconnect solutions for low-pressure fluid handling in countless products and processes.

For some time, low-pressure fluid-handling applications have utilized non-spill quick disconnects originally designed for highpressure environments. However, as more low-pressure uses for non-spill connectors emerged, it became clear that high-pressure couplings were over-engineered — and certainly costly — for connecting flexible, semi-rigid and reinforced tubing in lowpressure applications.

To precisely meet the non-spill requirements of low-pressure fluid applications, a new category of couplings has evolved: low-pressure, smallfootprint thermoplastic and metal quick disconnect couplings that maintain nonspill performance characteristics. The following six traits describe the evolution of the non-spill coupling tailored for low-pressure environments:

1.  Maintenance of flush-faced valves

2.  Switch from metal to engineered polymers

3.  Low-pressure environments, minimal pressure drop

4.  Compact design

5.  Ease of use

6.  Chemical compatibility

The preceding six evolutionary traits explain why and how today’s non-spill couplings have been designed to meet the unique requirements of low-pressure fluid-handling environments. What started as a high-pressure non-spill coupling has expanded beyond the scope of hydraulics to bring non-spill performance to many industries — and very likely, to products of the future taking shape on CAD program screens today.

For more detailed information, please read our white paper, 6 Traits of Non-Spill: How quick disconnect couplings
evolved for low-pressure fluid handling.

If you would like to learn more about CPC’s non-spill connectors OR any of our products, please email us.

RMW Pneus Purpose


The RMW Pneus is a blog that will contain information about components for industry that utilize fluid power, automation control, electrical controls, and safety products.  Brands that are discussed are directly represented by the R.M. Wright Company which is based in Farmington Hills, Michigan.  Please feel free to share information you discover with other individuals in your organization or with customers you service.

Our website can be visited at RM Wright Company.