External Gear Pump

Unobtainium.If you can find some!!

This is a crude but very accurate answer.

I invented a similar material : Poprylapenne.

Transalte from French, ''Pas pris la peine'', ''Did not make the effort''. It is intended as an universal failure mode material.

Sadly, Wikipedia rejected it...

most of these pumps use standard gears that are cheap in volume. When they wear out they want to use them as a cash cow and charge you $20 for a 25 cent gear. So search nylon gears and see their onlin catalogs. some people make custom gears to close this door for you.

There is no good answer to your question.

I recently looked to pump 1ml every 5 minutes with atmospheric discharge pressure.

This could very well be light duty, but the liquid is 10M Sulphuric acid...

This for example, a polymer is difficult to match to the media.

I would suggest you look at a similar pump data sheet for all the points covered and understand no single answer exists.

For my application, the gear pump was not a good choice, but peristaltic or diaphragm were.

Try DPF1 composite precision coating to refurbish your worn gear.coefficient of friction 0.01,worn rate 1/7 that of Babbitt metal.

I am familiar with Hydraulic pumps. But in hydraulics, gear pumps are pretty much disposables. The cost of rebuilding them is more than a new unit.

In high wear applications the best pump is a gerotor style.

Sorry, I was called away.

It depends on what you are willing to pay for a pump like these. But we have customers using these for pumping hot wax, liquid tar, and heavy oils. This will shortned the life of the pump compared to hydraulic oil, but it this is a substantially better option than any gear pump.

The people I dealt with that were using it for the Tar said they would go through 2-3 pumps per year. Used everyday on a highway truck. This is an extreme example but you get the idea.

From the posts I cannot tell the application. Is this a manfacturing application, or personal (duty cycle?)? I re-read the posts and my suggestion may be a little too industrial for your application, because these pumps cost about $250-300 CDN