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MIL-PRF-46170
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SPECIFICATION, GRADE, TYPE,
CLASS |
DESCRIPTION |
USES |
MIL-DTL-46170
Products |
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This specification covers the requirements for one type of synthetic hydrocarbon base hydraulic fluid
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Hydraulic Fluid, Rust Inhibited, Fire Resistant, Synthetic Hydrocarbon Base
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Intended for use in recoil mechanisms and hydraulic
systems of military ground vehicles and equipment. If used in other
mechanisms or systems, a study should be made to determine its
applicability for such usage
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Royco 770 Ty 1
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This hydraulic fluid is blended with highly refined mineral based oils
and modern additive technology to provide protection against rust, wear,
demulsibility, and to afford greatly improved viscosity - temperature
characteristics as well as enhanced oxidation – corrosion resistance.
MIL-PRF-46170 SCOPE
This specification covers the requirements for
one type of synthetic
hydrocarbon base hydraulic fluid.
The type of hydraulic fluid is as follows:
Type I - Undyed and Identified by Military Symbol FRH and
NATO Code No. H-544.
Intended use
The
hydraulic fluid covered by this specification is intended for use in
recoil mechanisms and hydraulic systems of military ground vehicles and
equipment.
If used in other mechanisms or systems, a study should be made to
determine its applicability for such usage, with particular attention
given to operation at high and low temperatures and the topic of
elastomer compatibility. The hydraulic fluid is rust inhibited and may
be used as a preservative medium for hydraulic systems and components.
The hydraulic fluid has a wide range of operating temperatures and is
thermally stable, corrosion inhibited, and fire resistant. The
combination of all of these quantities is not found in commercial
hydraulic fluids. This fluid is adopted for military use by NATO
countries. (NOTE: TYPE II of the previous revision “C”
is no longer available.)
Fluid handling
Owing to the difficulty of preventing contamination after the opening of
a container, it is recommended that the hydraulic fluid be purchased in
1-quart and 1-gallon containers by all users. If the fluid is dispensed
from larger containers, strict procedures must be employed to exclude
and remove moisture, solid particles or other contaminants from the
fluid.
Recommended corrosion inhibitor
It has been found that 1.75 ± 0.25% barium dinony1naphthalene sulfonate
provides the required degree of rust protection. The diluent of the rust
inhibitor should be the synthetic hydrocarbon base stock.
Handling and safety precautions
CAUTION: Personnel handling the product shall wear appropriate
impervious clothing to prevent repeated or prolonged skin contact.
The local environmental officials will relate health and safety
implications as well as to prescribe precise application of protective
clothing. If skin or clothing becomes moistened with the product,
personnel should promptly wash with soap or mild detergent and water.
Respirators are not required unless there is a potential for inhalation
exposure to misting. Personnel should wear protective clothing when
using the product and when cleaning up spills.
Background (safety)
The product may contain 0.5% tricresyl phosphate, of which not more than
0.01% may be present as the ortho isomer. If this ortho isomer of
tricresyl phosphate is absorbed through the skin or taken internally, it
may cause paralysis. The corrosion
inhibitor contains barium. The accumulated waste liquids will
have the exterior of the outer pack marked as containing barium and
tricresyl phosphate to assist disposal facilities to
manage the product according to regulations promulgated by the US
Environmental Protection
Agency under Public Law 94-580, Resource Conservation and Recovery Act
of 1976.
Storage conditions
Prior to use of product in the intended
equipment, the product
may be stored under conditions of covered or uncovered storage on
geographic areas ranging in
temperature from –57°C to 71°C (-71°F to 160°F).
Interchangeability and compatibility
MIL-PRF-46170 fluids are not
interchangeable with any other fluids.
MIL-PRF-46170 fluids are not to
be regarded as
compatible with any other fluids except those conforming to
MIL-PRF-5606,
MIL-PRF-6083,
MIL-PRF-83282, and
MIL-PRF-87257. Dilution with
MIL-PRF-5606 or
MIL-PRF-6083
severely lowers the flash point.
MIL-PRF-46170 Qualification
The hydraulic fluid furnished under this specification shall be
products that are authorized by the qualifying activity for listing on
the applicable qualified products list before contract award. Any change in the formulation of a qualified
product will require re-qualification.
Hydraulic fluid
The hydraulic fluid shall consist of a synthetic hydrocarbon base
stock (alpha-olefin polymer). Additives shall not include resins, gums,
fatty oils, oxidized hydrocarbons, chlorine or silica.
Kinematic viscosity
The kinematic viscosity of the hydraulic fluid shall
be as
specified in table below, TABLE 1:
TABLE I. Kinematic viscosity
| Temperature,°C (ºF) |
Kinematic viscosity, mm2 /s 1/ |
| 40 (104) |
19.5, maximum |
| 100 (212) |
3.4, minimum |
| -40 (-40) |
2600, maximum |
1/ mm
2/s = Square millimeters per second.
Trace sediment
The hydraulic fluid shall have maximum trace sediment of 0.005
milliliter (mL)
Water content
The hydraulic fluid shall have maximum water weight of 0.05
percent.
Acid or base number
The hydraulic fluid shall have maximum acid or base number of 0.20
milligrams (mg) of potassium hydroxide per gram of hydraulic fluid (mg
KOH/gram (g).
Bulk modulus
The isothermal secant bulk modulus of the hydraulic fluid shall be 1.379
x 106
kilopascals (kPa) minimum, at 40°C (104°F) at pressures between 0 and 68
950 kPa.
Water sensitivity
The light transmittance of a water-treated
sample of hydraulic
fluid shall be a minimum of 90%.
Corrosion protection (humidity cabinet)
The hydraulic fluid shall
protect specially
prepared steel test panels to the extent that no more than three
corrosion dots, none of which
exceed 1 mm in diameter, occur on any of the panels.
Corrosiveness (bimetallic couple)
The hydraulic fluid shall not
promote galvanic
corrosion, in excess of three spots, on any one of the steel test disks
covered with a brass clip.
Solid particle contamination
Particle size
The number of solid contamination particles per
100 mL of the
hydraulic fluid shall not be greater than the numbers specified in table
II.
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TABLE II. Particle size |
| 5-25 |
10,000 |
| 26-50 |
250 |
| 51-100 |
50 |
| over 100 |
10 |
Gravimetric method
The solid particle
contamination of the hydraulic fluid shall not be greater than 0.5
mg/100 mL.
Foaming characteristics
Foaming tendency
The foam volume of the
hydraulic fluid shall not exceed 65 mL (following any of the 5-minute
blowing periods of the foaming characteristics test.
Foam stability
There shall be no foam
remaining in the hydraulic fluid, in excess of a ring of bubbles around
the edge of the test container, following any of the 10-minute settling
periods of the foaming characteristics test.
Wear (Lubricity)
During the wear test, the hydraulic fluid shall
lubricate the steel balls such that the average scar diameters on the
steel balls shall not exceed 0.30 mm if the test load is 147 Newtons
(N), or 0.65 mm if the test load is 392 N.
High temperature - high pressure spray
ignition
The hydraulic fluid, when sprayed and ignited, shall be
self-extinguishing.
Linear flame propagation
The linear flame propagation
rate of the hydraulic fluid shall not exceed 0.30 centimeters per second
(cm/s).
Relative Density
(specific gravity)
The relative density of transparent low-viscosity hydraulic fluid
samples submitted for conformance testing shall be reproducible to no
more than +/-0.0012 and repeatable to no more than +/-0.0005 (no units)
between the temperature range of -2°C to +24.5°C (29°F to 76°F), and no
more than +/-0.008 from the relative density of the sample approved in
qualification testing. Relative density shall be expressed at 60°F/60°F
or at some temperature between 29°F to 76°F. Temperatures may be the
same or different, but in both cases shall be explicitly stated, for
example, 65°F/65°F, or 50°F/65°F. Report the final value as relative
density, with no dimensions, at the two reference temperatures, to the
nearest 0.0001.
Interface requirements
Corrosiveness and oxidation stability (metal
protection)
Weight change of test specimens
The
hydraulic fluid shall not produce corrosion or oxidation effects such
that the weight change of the metal specimens, except for copper
specimen, exceeds a gain or loss of 0.2 milligrams per square centimeter
(mg/cm2). For the copper specimen, the
weight gain or loss shall not exceed 0.6 mg/cm2
Appearance of test specimens
The hydraulic fluid
shall not cause etching, pitting, or visible corrosion on the surface of
the metal specimens, except for the copper specimen. Any corrosion
produced on the surface of the copper specimen shall not be greater than
No. 2 of ASTM D130 Copper Corrosion Standards.
Viscosity change
The viscosity of the oxidized hydraulic fluid
at 40°C (104°F)
shall not change more than ±10% from the initial viscosity measured at
40°C (104°F).
Acid or base number change
The acid or base number of the
oxidized hydraulic
fluid shall not increase more than 0.30 mg KOH/g over the initial acid
or base number.
Insoluble material
The oxidized hydraulic fluid shall exhibit
no insoluble
materials or gum when examined.
Swelling of synthetic rubber
Following immersion in the hydraulic
fluid at a
temperature of 70°C (158°F) for 168 hours, standard synthetic rubber
NBR-L, in accordance
with (IAW) SAE AMS 3217/2B, shall exhibit a percent volume change within
the range of 15 to
25%.
Compatibility
The hydraulic fluid shall be compatible, in all
concentrations, with
each of the fluids approved under this specification, as well as
hydraulic fluids conforming to:
MIL-PRF-5606,
MIL-PRF-6083,
MIL-PRF-83282, and
MIL-PRF-87257
Fire point
The minimum fire point of the hydraulic fluid shall be
246°C (475°F)
.
Pour point
The maximum pour point of the hydraulic fluid shall be
-54°C (-65°F)
Evaporation loss
The maximum mass percent evaporation loss of the
hydraulic
fluid shall be 5%.
Autoignition temperature
The minimum autoignition temperature of
the hydraulic
fluid shall be 343°C (649°F).
Low temperature stability
The hydraulic fluid shall show no
evidence of gelling,
crystallization, solidification or separation of insoluble material when
subjected to a temperature
of -40 ± 6°C (-40 ±11°F) for 72 hours.
Packaging
For acquisition purposes, the packaging requirements shall be
specified
in the contract or order. When actual packaging of materiel is
to be performed by DoD
or in-house contractor personnel, these personnel need to contact the
responsible packaging
activity to ascertain packaging requirements. Packaging requirements are
maintained by the
Inventory Control Point's packaging activities within the Military
Services or Defense Agency,
or within the military service's system commands. Packaging data
retrieval is available from the
managing Military Department's or Defense Agency's automated packaging
files, CD-ROM
products, or by contacting the responsible packaging activity.
 
Give us a call for pricing and availability.
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