Instructables

Make a better penetrating oil

Picture of Make a better penetrating oil
We found a low-cost, do-it-yourself competitor with WD-40 lubricating spray: Vegetable oil and acetone.

A team at Drexel University in Philly conducted side-by-side comparison tests of vegetable oil mixtures, WD-40 and automatic transmission fluid, and found that a mixture of vegetable oil with 10 percent acetone works as well to free rusted bolts as WD-40. And it costs about one-tenth of the price. Add more acetone, up to 30 percent, and the mixture works even better than WD-40 and still costs about one quarter the price.

Acetone, by the way is the active ingredient in nail polish remover and some paint thinners, and DIY mixtures with transmission fluid are sometimes used as a penetrating oil.

[Images by (left to right)  cottonseedoil, dchou0123 and ATWJ - mhoey.eu / Flickr]
 
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Step 1: Tested & approved

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penetrating-oil-cost.jpg
The Drexel team placed 3/4” and 1-1/8” nuts and bolts in salt and sulfuric acid solutions for one week to rust. Then they applied penetrating oil mixtures and tested the bolts with a torque wrench.

Results
Vegetable oil with five percent acetone works. Increasing the acetone to 10 percent or up to 30 percent boosts performance. At higher concentrations, you can free the seized bolt using less than half of the force that it takes with WD-40.

The bottom line is that vegetable oil with 10 percent acetone is more effective at freeing seized bolts than WD-40, it's as effective as ATF and acetone, and it is more widely available in rural developing areas and kinder to the planet both in manufacture and disposal.

This might be useful in anyone's garage, but we're hoping that it's especially helpful in rural developing areas where commercial lubricating sprays can be expensive and vegetable oils are easy to find and even possible to make.

The tables show a cost analysis and a comparison of the force needed to remove a seized bolt (courtesy of the Drexel team).

Step 2: Details

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For details, see E4C's report: How to make penetrating oil
And Drexel's test results (pdf)
eric m11 months ago
Engineering for change. Someone below who did the study said the CHART IS WRONG.

FIX IT!


"yeah this may be a data error. I didn't craft the chart above. On my final report however it does in fact show a decrease in required torque for the rusted bolt with the increase in acetone. I'll see if I can find the report and post that chart for a correction. "

eric m11 months ago
Awesome instructable. Great work!
notingkool1 year ago
I try to make homemade wd-40 one time, but i use mineral oil and benzine (A.K.A petroleum eter or white spirit ), as in the original formula.
I use much less oil than you, 20% oil and 80% benzine, it work as well as the wd-40, but the fact of not having a properly way to store it, the benzine dry and only left the oil behind.
The wd-40 also have a light grease and deoxidants.

Cool instructable by the way.
One of the reasons the acetone is so little and the oil is so high is because we wanted to have a low cost in the making of the penetrating oil. So by increasing the oil content and keeping the acetone content fairly low it allows for a lower price overall with little effect on performance.
oh, i thought that you use more oil to improve the lubrication. because the wd-40 it doesn't lube to much. The penetration of the oil in the piece is the same with your formula than with wd-40? i doesn't affect the viscosity? i have that doubt.
Oil does definitely help in lubrication. Let me clarify more on the fact that acetone alone can't do the job alone. Acetone can evaporate very quickly so for being a penetrating oil acetone cannot do the job. The oil is mainly their for lubrication so you are correct.
Good tip, thanks.
It was a secret for a long time but the lubricant in WD-40 is actually fish oil.
not lubricant *** WATER DISPLACEMENT**** 40th attempt hence WD40 !!
However i love your instrucable and will try itout Thank you.
pfred2 georion1 year ago
WD-40 was originally developed as a conservative agent to store missiles. Or so I've heard. They made it to stop rust, not fix the stuff. If what you have is already rusty it is too late for WD-40 to do you much good.
Not my instructable. And I stand corrected.
Are you sure the data in your chart is entered correctly? Your explanation states that as the volume of acetone was increased, the torque value decreased, but according to your chart, the torque value increases????? What's up with that?
yeah this may be a data error. I didn't craft the chart above. On my final report however it does in fact show a decrease in required torque for the rusted bolt with the increase in acetone. I'll see if I can find the report and post that chart for a correction.
heathbar641 year ago
So what torque was required to loosen a control bolt with no penetrant whatever?
I would like to see these formula's compared with PB blaster, which is a much better product for rusty bolt removal than wd 40.
Was your formula ever actually tested on a real world frozen bolt?
What happened then?
Hey there, I was one of the students who did the following project in my freshman design group. We tried getting a control with no penetrating oil, however the force applied to the torque wrench actually broke our torque wrench. I mean we would off tried again however we didn't want to risk breaking another one since we only had 2.

The bolts we used were coated with sulfuric acid and then sat in a container containing salt water for about a week. Is this real world? No. But its the closest we could come to as for a "realistic" approach.

We didn't try PB blaster. I would of liked to have done it for more results however we didn't have the necessary time.

I would like to try it on a real world frozen bolt. I'll see if I have the time, or maybe someone on this forum already has and maybe can share the result.

I use PB Blaster too. WD-40 is worthless as a penetrating oil. My precious bodily fluids would probably break stuff free faster.
wire-nut1 year ago
WD-40 means water dissplacer formula 40.
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