Rapid-Air AIR FEED - Manual (Page 4)

RAPID-AIR PRESS FEEDS
LUBRICATION OF THE O-RINGS
The "0" Rings furnished with Rapid-Air Feeds are made of Buna N compound designed to give
long life on service with air, oil and water. This rubber compound features high abrasion
resistance and good dimensional stability if the recommendations listed below are followed.
A filter and lubricator should be used; the filter to remove grit that would otherwise act as an
abrasive, and the lubricator to'provide an adequate quantity of oil. For best results, avoid an
excess of oil.
Paraffin base oils in general will give the best service. The viscosity should be 140-17S.S.U., the
API gravity 29.5 minimum and the aniline point between 150° F and 210° F. Variation of the
aniline point from the limits given is likely to cause either shrinkage or stretching of the "0"
rings.
Detergent motor oils and all other oils designed for automotive use are generally unreliable in
chemical makeup for use with rubber compounds. Spindle oils are too low in viscosity.
The group of oils listed below are generally recommended for Buna N Compound 366Y "0"
rings. This grouping is given in good faith and because of the constant changes made on oils by
the manufacturers, we cannot guarantee any consistency of chemical makeup. All of these oils
have an aniline point of 210, an API gravity of 29.5 minimum and a viscosity of 140-170 S.S.U.
The base stock is paraffin.
Recommended:
Air Feeds: 10W paraffin base hydraulic oil such as Mobile DTE Light. Reels,
Straighteners and P1V gear boxes: Mobil 600W. PMDs and Servos:
Mobil SHC 630 Syn.