TargetTalk

Does molybdemun disulfide attacks rubber seals on air pistols?

rmca wrote:Does molybdemun disulfide attacks rubber seals on air pistols?

My take is it depends on carrier grease.

the info below is from:
http://www.pyramydair.com/blog/2005/03/ ... -the-ugly/

- Dave

What about moly?
Over the past 15 years, lubricants containing molybdenum disulphide, or moly, have really blossomed in the shooting sports. Moly is a compound that forms a bond with most steels, making a slick surface that doesn’t wear away. It’s always best when adhering to metal in its dry state, where the grease that’s often compounded with it as a carrier does not remain on the surface. Unfortunately, many shooters are not aware of that.

Moly is very slick, but it can be hindered by its own carrier grease or oil. If the surface to which it is applied has extremely close tolerances, such as in triggers and some firing mechanisms, moly grease will actually slow things down and bind them from operating correctly.

On certain jacketed bullets in firearms, moly performs wonders, making the bore ultra-slick after long use. When applied to pure lead projectiles such as pellets, where the lead has great lubricity of its own, moly coatings are often a waste of time.

I successfully used Dri-Slide in my FWB 65 and 90 air pistols. Just squirt it in, work the parts a little, and let dry overnight.

I used 'Molykote' for many years in my rapid fire pistols (.22short) and standard pistols in the breech to aid reliable extraction.

Molykote is the trade name in the UK for molybdenum disulphide suspended in alcohol. It was (is) used in the manufacture of limited slip differential axles by impregnating the parkerised coating on the plates.

I treated the bore every 2,000 rounds or earlier if there was a problem or before a competition.

Does molybdemun disulfide attacks rubber seals on air pistols?

In my experience the only grease that has no effect on AP seals is silicone grease.

Brian -

The only links to Molykote that I can find in the US are for a moly grease. Are you referring to something like one of these?

Dry Moly Lube, Aerosol, 11 Oz:
http://tinyurl.com/lb5qbyv

SCHAEFFER 308 MOLY DRI-PLATE
http://tinyurl.com/n49w8s2

BTW, how does it affect the bullet velocity or the loading?
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Not to hijack the thread entirely, the grease I use on o-rings on my AP and in the shop is this:

http://www.mcmaster.com/#9463k33/=t8wxmd

McMaster-Carr also has a compound with moly, but I don't use it because some of the o-rings I have to service are silicone rubber and it's not compatible.

http://www.mcmaster.com/#1325k54/=t8wyjj

It's expensive, but it's a lifetime supply.

Roger

RandomShotz wrote:Brian -

The only links to Molykote that I can find in the US are for a moly grease. Are you referring to something like one of these?

Dry Moly Lube, Aerosol, 11 Oz:
http://tinyurl.com/lb5qbyv

SCHAEFFER 308 MOLY DRI-PLATE
http://tinyurl.com/n49w8s2

BTW, how does it affect the bullet velocity or the loading?

Roger

Roger those two look like a similar product but they are not grease, the one I used came in drums ready for the spray booths. The spec sheet for LU200 states "Assembly and run-in lubrication" which is the use in Limited Slip Diffs.

I suggest cleaning the bore of any grease etc then spray onto a clean patch and run that through the bore.

It made extraction and therefore feeding reliable in my r/f pistol, I never checked the velocity but the point of aim remained the same.

ATB
Brian

The one I was refering to was the Lyman's Super Moly Bore Cream http://www.lymanproducts.com/lyman/tumb ... -cream.php

I have used Guard Dog Moly GD 525 grease that is compatible for airgun seals:

http://www.guarddogmoly.com/gd525.shtml

I use silicone oil on seals. Works great, and is a dry lubricant so it doesn't attract dirt.