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RT-1148
Tyco Modified Fluoroelastomer Tubing
Flexible, Abrasion Resistant, Heat-Shrinkable
SCOPE:
This specification covers the requirements for one type of highly
flexible, electrical-insulating extruded tubing whose diameter will reduce
to a predetermined size upon the application of heat in excess of 175°C
(347°F).
Approved Signatories*
TE Connectivity : Approved electronically via DMTech
* This document is electronically reviewed and approved - therefore no signatures will appear.
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1. Revision History
Revision Number
Change Request
Date
Incorporated by
9
Mar 2017
2. Applicable Documents
This specification takes precedence over documents referenced herein. Unless otherwise
specified, the latest issue of the referenced document applies. The following documents
form a part of this specification to the extent specified herein.
2.1 Government Furnished Documents
Military
MIL-DTL-83133 Turbine Fuels, Aviation, Kerosene Types, Nato F-34 (JP-8), Nato F-35
and JP-8+100
SAE-AMS-1424 Anti-Icing and Deicing - Defrosting Fluid
MIL-PRF-46170 Hydraulic Fluid, Rust Inhibited, Fire-resistant, Synthetic Hydrocarbon
Base
Federal
A-A-59133 Commercial Item Description Cleaning Compound, High Pressure
(Steam) Cleaner
A-A-52557 Fuel Oil, Diesel; for Posts, Camps and Stations
2.2 Other Publications
American Society for Testing & Materials (ASTM)
D 4814 Automotive Spark-Ignition Engine Fuel Std. Spec. for
D 257 Standard Test Methods for D-C Resistance or Conductance of Insulating
Materials
D 2240 Test Method for Rubber Property -- Durometer Hardness
D 2671 Method of Testing Heat-Shrinkable Tubing for Electrical Use
G-21 Standard Recommended Practice for Determining Resistance to Synthetic
Polymeric Materials to Fungi
(Copies of ASTM publications may be obtained from the American Society for Testing
& Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.)
3.0 Requirements
3.1 Material
The tubing shall be fabricated from thermally stabilized, modified fluoroelastomer and
shall be crosslinked by irradiation. It shall be homogeneous and essentially free from
flaws, defects, pinholes, bubbles, seams, cracks and inclusions.
3.2 Color
The tubing shall be black.
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3.3 Properties
The tubing shall meet the requirements of Table 3.
4.0 Quality Assurance Provisions
4.1 Classification of Tests
4.1.1 Qualification Tests
Qualification tests are those performed on samples submitted for qualification as
satisfactory products and shall consist of all tests listed in this specification.
4.1.2 Acceptance Tests
Acceptance tests are those performed on tubing submitted for acceptance under contract.
Acceptance tests shall consist of the following: Dimensions, Longitudinal Change,
Tensile Strength, Tensile Stress, Ultimate Elongation, Heat Shock and Hardness.
4.2 Sampling Instructions
4.2.1 Qualification Test Samples
Qualification test samples shall consist of 50 feet (15 m) of tubing of the size specified.
Qualification of any size within each size range will qualify all sizes in the same range.
Range of Sizes
1/4 through 3/4
7/8 through 3
4.2.2 Acceptance Test Samples
Acceptance test samples shall consist of not less than 16 feet (5 m) of tubing selected at
random from each lot. A lot shall consist of all tubing of the same size, from the same
production run and offered for inspection at the same time.
4.3 Test Procedures
Unless otherwise specified, tests shall be performed on specimens which have been fully
recovered by conditioning in accordance with 4.3.1. Prior to all testing, the test
specimens (and measurement gauges, when applicable) shall be conditioned for 3 hours
at 23 ± 3°C (73 ± 5°F) and 50 ± 5 percent relative humidity. All ovens shall be of the
mechanical convection type in which air passes the specimens at a velocity of 100 to 200
feet (30 to 60 m) per minute.
4.3.1 Dimensions and Longitudinal Change
Measure three 6 inch (152 mm) specimens of tubing, as supplied, for length ± 1/32 inch
(± 1 mm) and inside diameter in accordance with ASTM D 2671. Condition these
specimens for 10 minutes in a 200 ± 5°C (392 ± 9°F) oven or equivalent, cool to 23 ±
3°C (73 ± 5°F) and then remeasure. Calculate longitudinal change as follows:
C = L1 - L0
L0 x 100
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Where: C = Longitudinal Change [Percent]
L0 = Length Before Conditioning [inches (mm)]
L1 = Length After Conditioning [inches (mm)]
4.3.2 Tensile Strength, Tensile Stress and Elongation
Test three specimens of tubing for tensile strength, tensile stress and elongation in
accordance with ASTM D 2671. For tubing sizes 3/8 and smaller, the specimens shall be
full sections of tubing; for sizes 1/2 and larger, the specimens shall be cut with die D of
ASTM D 412. The specimens shall have1 inch (25 mm) bench marks centrally located.
The testing machine shall have an initial jaw separation of 1 inch (25 mm) for full
sections of tubing and 2 inches (51 mm) for die-cut specimens. The rate of jaw separation
shall be 20 ± 2 inches (508 ± 50 mm) per minute.
4.3.3 Low Temperature Flexibility
Condition three specimens, each 12 inches (300 mm) in length and a mandrel selected in
accordance with Table 2, at -65 ± 5°C (-85 ± 9°F) for 4 hours. For tubing sizes 3/4 or
less, the specimens shall be whole sections of tubing recovered on a stranded wire
(nearest AWG which is larger than the sleeving maximum inside diameter after
unrestricted shrinkage). For tubing sizes larger than 3/4, the specimens shall be 1/4-inch
(6.3 mm) wide strips cut from tubing which has been recovered in accordance with 4.3.1.
After 4 hours conditioning and while still at the conditioning temperature, wrap the
specimens around the mandrel for not less than 360 degrees in 10 ± 2 seconds then
visually examine the specimens for evidence of cracking.
4.3.4 Heat Shock
Three 6 inch (152 mm) specimens of tubing shall be conditioned for 4 hours in a 225 ±
5°C (437 ± 9°F) oven. After conditioning, remove the specimens from the oven, cool to
room temperature and bend through 180 degrees in 2 to 4 seconds over a mandrel
selected in accordance with Table 2. Visually examine the specimens for evidence of
dripping, flowing or cracking. Any side-cracking caused by flattening of the specimen on
the mandrel shall not constitute failure.
4.3.5 Heat Resistance
Three 6 inch (152 mm) specimens of tubing shall be conditioned for 168 hours in a 150 ±
3°C (302 ± 5°F) oven. After conditioning, remove the specimens from the oven, cool to
room temperature and test for ultimate elongation in accordance with 4.3.2.
4.3.6 Copper Stability
Three 6 inch (152 mm) specimens of tubing shall be slid over snug- fitting, straight,
clean, bare copper mandrels, either solid or tubular. The specimens on the mandrels shall
be conditioned for 24 hours in a desiccator or similar humidity chamber at 90 to 95
percent relative humidity and 25 ± 3°C (77 ± 5°F).
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The specimens on the mandrels then shall be conditioned for 168 hours in a 150 ± 2°C
(302 ± 4°F) oven. After conditioning, the specimens shall be removed from the oven and
cooled to 23 ± 3°C (73 ± 5°F).
The copper mandrels shall then be removed from the tubing and the tubing and copper
mandrels shall be examined. Darkening of the copper due to normal air oxidation shall
not be cause for rejection. The tubing shall be tested for ultimate elongation in
accordance with 4.3.2.
4.3.7 Dielectric Strength
The dielectric strength shall be determined by following the ASTM D 2671 procedure
for dielectric breakdown. When dielectric breakdown occurs the thickness
measurements for calculating dielectric strength shall be made adjacent to the point of
breakdown and the dielectric strength shall be calculated in volts per mil.
4.3.8 Corrosive Effect
The tubing shall be tested for copper mirror corrosion in accordance with ASTM D 2671,
Procedure A. The specimens shall be conditioned for 16 hours at 175 ± 3°C (347 ± 5°F).
4.3.9 Fluid Resistance
Six specimens, three 6 inch (152 mm) tubing specimens, which shall be weighed prior to
immersion and three tensile specimens prepared and measured in accordance with 4.3.1,
shall be immersed for 24 hours in each of the test fluids listed in Table 3 at the
temperature specified. The volume of the fluid shall not be less than 20 times that of the
specimens. After conditioning, all the specimens shall be lightly wiped and air dried for
45 ± 15 minutes at 23 ± 3°C (73 ± °F). The three specimens intended for the tensile
strength and elongation tests shall then be tested in accordance with 4.3.2. The other
three specimens shall be weighed before and after immersion and the weight change
calculated as a percentage.
4.4 Rejection And Retest
Failure of any sample of tubing to conform to any one of the requirements of this
specification shall be cause for rejection of the lot represented. Tubing which has been
rejected may be replaced or reworked to correct the defect and then resubmitted for
acceptance. Before resubmitting, full particulars concerning the rejection and the action
taken to correct the defect shall be furnished the inspector.
5.0 Preparation For Delivery
5.1 Form
Unless otherwise specified, the tubing shall be supplied on spools.
5.2 Packaging
The tubing shall be packaged in accordance with good commercial practice. The exterior
shipping container shall not be less than 125-pound-test fiberboard.
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5.3 Marking
Each bundle or container of tubing shall be permanently and legibly marked with the
size, quantity, manufacturer's identification and a lot number.
TABLE 1
TUBING DIMENSIONS
Expanded
As Supplied
Recovered Dimensions -- After Heating
Size
Inside Diameter
Inside Diameter
Wall Thickness
Minimum
Maximum
Minimum
Maximum
Nominal
in.
mm.
in.
mm.
in.
mm.
in.
mm.
in.
mm.
1/4
0.250
6.35
0.125
3.18
0.028
0.71
0.042
1.06
0.035
0.88
3/8
0.375
9.53
0.187
4.75
0.028
0.71
0.042
1.06
0.035
0.88
1/2
0.500
12.70
0.250
6.35
0.028
0.71
0.042
1.06
0.035
0.88
5/8
0.625
15.87
0.312
7.92
0.035
0.88
0.049
1.24
0.042
1.06
3/4
0.750
19.05
0.375
9.53
0.035
0.88
0.049
1.24
0.042
1.06
7/8
0.875
22.22
0.437
11.09
0.035
0.88
0.055
1.39
0.045
1.14
1
1.000
25.40
0.500
12.70
0.038
0.96
0.060
1.52
0.049
1.24
1-1/4
1.250
31.75
0.625
15.87
0.040
1.00
0.070
1.77
0.055
1.39
1-1/2
1.500
38.10
0.750
19.05
0.040
1.00
0.070
1.77
0.055
1.39
2
2.000
50.80
1.000
25.40
0.048
1.21
0.082
2.08
0.065
1.63
3
3.000
76.20
1.500
38.10
0.048
1.21
0.082
2.08
0.065
1.63
TABLE 2
Mandrel Dimensions
Tubing
Mandrel Diameter
in.
mm.
1/4 to 3/8 inclusive
5/16
7.9
1/2 to 3 inclusive
7/16
11.1
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TABLE 3
Requirements
PROPERTY
UNIT
REQUIREMENT
TEST METHOD
PHYSICAL
Dimensions
inches (mm)
In accordance with Table 1
Section 4.3.1
Longitudinal Change
percent
-10 to +2
ASTM D 2671
Tensile Strength
psi (MPa)
2500 (17.2) minimum
Section 4.3.2
Tensile Stress at 100% elongation
psi (MPa)
1500 (10.3) maximum
ASTM D 2671
Ultimate Elongation
percent
350 minimum
Specific Gravity
1.5 maximum
ASTM D 2671
Hardness
Shore A
80 ± 10
ASTM D 2240
Low Temperature Flexibility
4 hours at -65 ± 5°C (-85 ± 9°F)
---
No cracking
Section 4.3.3
Heat Shock
4 hours at 225 ± 5°C (437 ± 9°F)
---
No dripping, flowing or cracking
Section 4.3.4
Heat Resistance
168 hours at 150 ± 3°C (302 ± 5°F)
Followed by test for:
---
---
Section 4.3.5
Tensile Strength
Ultimate Elongation
psi
percent
2000 (13.8) minimum
300 minimum
Section 4.3.2
Copper Stability
168 hours at 150 ± 2°C (302 ± 4°F)
Followed by test for:
No brittleness, glazing or
cracking of tubing; no pitting
or blackening of copper
Section 4.3.6
Ultimate Elongation
percent
200 minimum
Section 4.3.2
ELECTRICAL
Dielectric Strength
Volts/mil
(Volts/mm)
300 (11,800) minimum
Section 4.3.7
Volume Resistivity
ohm-cm
1010 minimum
ASTM D 257
CHEMICAL
Flammability
seconds
Self-extinguishing within
15 seconds; no dripping or
flowing; no burning or charring
of indicator
ASTM D 2671
Corrosive Effect
16 hours at 175 ± 3°C (347 ± 5°F)
Noncorrosive
Section 4.3.8
ASTM D 2671
Fungus Resistance
Rating of 1 or less
ASTM G 21
Fluid Resistance
24 hours at 25 ± 3°C (77 ± 5°F) in:
Cleaning Compound (A-A-59133)
Gasoline Automotive
(ASTM D 4814)
JP-8 Fuel (MIL-DTL-83133)
---
---
Section 4.3.9
Water
Followed by tests for:
Tensile Strength
psi (MPa)
1800 (11.0) minimum
Section 4.3.2
Ultimate Elongation
percent
300 minimum
Weight Increase
percent
20 maximum
Section 4.3.9
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TABLE 3
Requirements
CHEMICAL (Continued)
Fluid Resistance
24 hours at 50 ± 3°C (122 ± 5°F) in:
Deicing Fluid (SAE-AMS-1424)
Hydraulic Fluid (MIL-PRF-46170)
Diesel Fuel (A-A-52557)
5% Salt Solution (ASTM D 632)
Followed by tests for:
---
---
Section 4.3.9
Tensile Strength
psi (MPa)
1800 (11.0) minimum
Section 4.3.2
Ultimate Elongation
percent
300 minimum
Weight Increase
percent
10 maximum
Section 4.3.9
Fluid Resistance
24 hours at 100 ± 3°C (212 ± 5°F) in:
Hydraulic Fluid (MIL-PRF-46170)
---
---
Section 4.3.9
Followed by tests for:
Tensile Strength
psi (MPa)
1800 (11.0) minimum
Section 4.3.2
Ultimate Elongation
percent
300 minimum
Weight Increase
percent
10 maximum
Section 4.3.9
