All gear oils should contain a
foam inhibitor, probably in the range of 5 to 10 parts per million. In order to
arrive at approximately the correct proportion of such an additive, it is best
to use a concentrate. This may be a ten per cent dispersion of a dimethy1
silicone in either kerosene or carbon tetrachloride.
Suppliers of silicone polymers
offer antifoam additives, most often as concentrates and will suggest
proportions to add to gear lubricants. Other compounds or dispersions of the same
are also available from
additive suppliers who furnish
instructions for use.
While most
industrial gear oils are not subjected
to elevated temperatures, the presence
of a small proportion of oxidation
inhibitor is an assurance of long
life and little deterioration of the
oils. Additives such as 2, 6 – ditertiary – buty1 -4 – methyl phenols or phenyl alpha or
beta naphthylamine , used in
proportions of 0.1 to 1.0 per
cent, should be found satisfactory
for most
straight mineral gear oils. The first compound or one quite similar
is supplied by several concerns, often under a trade name. Other antioxidants
will be noted in
various formulations to follow
and will also be
found in Boner where the source
is also shown.
For special applications other
types of additives may also be found necessary in what can be classed as
straight mineral oils. Thus, Watson and
Tierney Formulated oils to be used under
wet conditions on paper making
machines where a circulating oil
would serve both bearings and
gears. Since, in this operation, the oil passing through the system is
quickly contaminated with
water which settles out,
retention of the rust preventive additive is quite important. A suitable
formulation, which retained the major portion of the additives after over a 1000 hours of service, consists of : a base
oil blended from a paraffin distillate
and a paraffin residual and having a
viscosity SUS at 100 degree F of 653, a pour point of -10 degree F, and a V.I. of
85; 2.0 per cent by weight
of a 50 per cent concentrate
of barium dinonylnaphthalene sulfonate in a light oil; 0.75 per cent of Zinc dimethylisobutyl carbinyl
dithiophosphate ; 0,10 per cent
of a chlorinated paraffin
wax naphthalene condensation
product; and 150 ppm of a 10 per
cent solution of dimethyl
silicone polymer in kerosine.
Preservative used in wine-making and other processed foods. According to the FDA, approximately one in 100 people is sensitive to sulfites in food. The majority of these individuals are asthmatic, suggesting a link between asthma and sulfites. Individuals who are sulfite sensitive may experience headaches, breathing problems, and rashes. In severe cases, sulfites can actually cause death by closing down the airway altogether, leading to cardiac arrest. visit here
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