Lubricant testing

Hi Richard,

I agree with you in terms of collecting a lot of historical data to try to make some sense of the the latest data.

From what I have heard, I think this test has far too many variables. (Water quality as you advised, tramp oil on the surface of the sample, sample surface vibration, sample temperature, the condition of the thread, air currents at the surface of the sample, repeatability each time the thread is dropped, plus of course pH, lubricant concentration and so on.)

Cheers
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
519 641-3212

Hello rdking,

The testing of the wet out of a lubricant is essential in verifying that indeed a lubricant boundary layer has coated 100% of the wire surface before it is drawn in a die.

Before running the test however you must be sure to have no tramp oil or dirt floating on the surface of the lubricant sample because this will interfere with the test.

After the one inch sample of Draves web thread is placed on the surface of the sample, the time is measured until the web thread sinks beneath the surface.

A time of between 5 and 25 seconds is considered acceptable.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
519 641-3212

Hello again,

The most difficult thing about this test is to ensure repeatability. No vibration or turbulence in the sample. Thread dropped on to the surface of the lubricant exactly the same way each time.

It may take some practice to get the test conditions the same each time.

Regards
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
519 641-3212

How is one able to make a conclusion of what the wetability of lubricant is on a metallic wire or draw capstan based upon dropping a cotten thread into solution?

RB

Hi Spectre07,

The test provides an indication of surface tension.

Cheers
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com
519 641-3212

Peter, Draves references ASTM D2281. there are a couple of comments regarding "applicable", "information correlating" and "specific end use".

I think the polished rod that you dip into the solution and then observe how the lubricant "withdraws" on the rod is an easier. It may be subjective, but there are a lot of variables with the Draves such as the yarn type, dernier, how you shape the skein, etc.

Anyway, anything to spark some feedback. Richard

ASTM D2281
Abstract

This test method covers the determination of the efficiency of ordinary commercial wetting agents using the skein test. It is applicable under limited and controlled conditions, but does not necessarily yield information correlating with specific end uses. The apparatus is comprised of a hook of standard weight depending on the concentration of the wetting agents and an anchor which shall be a flat, cylindrical, lead slug of specific dimensions. The reagents shall consist of water, acid and base test solutions, and wetting agent. The average of at least four determinations of the sinking time for each concentration of wetting agent shall be obtained and presented in plots with logarithmic coordinates. Standard deviation based on six replicate determinations shall also be calculated for precision.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

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1. Scope

1.1 This test method2,3 covers the determination of the efficiency of ordinary commercial wetting agents as defined in Terminology D 459. This test method is applicable under limited and controlled conditions, but does not necessarily yield information correlating with specific end uses.

1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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2. Referenced Documents

D459 Terminology Relating to Soaps and Other Detergents

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Index Terms

ICS Number Code 71.100.40 (Surface active agents)

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DOI: 10.1520/D2281-68R05

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