REFRIGERATION LUBRICANTS
After
the Montreal Protocol several new classes of refrigerants
such as HFCs, PFCs and interim blends of HFCs and HCFCs
were developed. Mineral oils and alkylbenzenes were ineffective
with the new refrigerants. Synthetic lubricants such
as polyol esters (POE) and polyalkylene glycols (PAG)
were found to work effectively. The primary difference
with these new lubricants is that they are miscible with
the new refrigerants.
Miscibility
and solubility between the refrigerant and lubricant
determine how the two will behave throughout the system.
Miscibility is defined as the ability of two liquids
to mix together to form a single liquid phase. Solubility
is the ability of a gas to dissolve into a liquid.
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Sub
Categories
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Complete |
Freon
R-12(CFC) / BVA 3 (MO)
134a (HFC) and RPOE LT 32 (POE) |
Partial |
Freon
R-22 (HCFC) / BVA 4 (MO)
R-134A (HFC) / RPOE 68 (POE). |
Immiscible |
134A (HFC) / BVA 3 (MO) |
There
are three types of miscibility. Completely miscible is
where the refrigerant and oil mix to form a single phase
over the applied temperature range. Partially miscible
is a single phase over a limited temperature range. The
temperature at which the lubricant and the refrigerant
separate into two phases is called the critical solution
temperature (CST). Immiscible is when the oil and refrigerant
do not mix and stay in two phases.
The
BVA RPOE™ Series offers excellent miscibility with HFC
refrigerants. It also has excellent chemical and thermal
stability, as well as, superior lubricity characteristics
on steel and aluminum. To ensure that BVA has the right
polyol ester for your application, the BVA RPOE™ Series
comes in a wide range of viscosities ranging from ISO 22
(RPOE™22) to an ISO 370 (RPOE™ 370). ™
BVA
RPOE™ Series standard group comes witha non intrusive
additive package which is suitable for most applications.
BVA
RPOE™ EP is a polyol ester with a specially formulated
extreme pressure additive for aluminum, bronze and steel.
If your application requires an additive free POE then
RPOE™ NA would be your choice.
BVA
RPOE™ Series
is miscible with all HFC, HCFC, CFC and blends. The series
was specifically developed for HFC refrigerants. If you
decide to use BVA RPOE™ with CFC for an extended period
of time, please contact BVA OILSto
get the correct viscosity recommendation. BVA RPOE™ Series
is available in 16 oz., 32 oz., 1 gallon, 5 gallon and
55 gallon containers. BVA RPOE™ EP and NA are made to
order.
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