Tyco Electronics Corporation
300 Constitutional Drive
Menlo Park, CA 94025 USA
Specification
This Issue:
Date:
Replaces:
RT-350
Issue 17
April 9, 2004
Issue 16
THERMOFIT® RNF-100 TUBING
Polyolefin, Flexible, Heat-Shrinkable
1.
SCOPE
This specification covers the requirements for two types of flexible electrical insulating, extruded tubing
whose diameter will reduce to a predetermined size upon the application of heat in excess of 121°C
(250°F).
1.1
TYPE 1
Type 1 tubing shall be flame-retardant and shall be black, white, red, yellow, or blue unless otherwise
specified.
1.2
TYPE 2
Type 2 tubing shall not be flame-retardant and shall be clear.
2.
APPLICABLE DOCUMENTS
This specification takes precedence over documents referenced herein. Unless otherwise specified, the latest
issue of referenced documents applies. The following documents form a part of this specification to the
extent specified herein.
2.1
GOVERNMENT-FURNISHED DOCUMENTS
Military
ASTM D 910
MIL-PRF-5606
MIL-T-83133
MIL-STD-104
2.2
Gasoline, Aviation, Grades 80/87, 100, and 115/145
Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance
Turbine Fuel, Aviation, Grade JP-8
Limits for Electrical Insulation Color
OTHER PUBLICATIONS
American Society for Testing and Materials (ASTM)
D 910
Standard Spec. for Aviation Gasolines
D 2671
Standard Methods of Testing Heat-Shrinkable Tubing for Electrical Use
(Copies of ASTM publications may be obtained from the American Society for Testing and Materials, 1916
Race Street, Philadelphia, Pennsylvania 19103.)
International Organization for Standardization (ISO)
ISO 846
Plastics – Evaluation of the action of Microorganisms
(Copies of ISO publications may be obtained from the International Organization for Standardization, 1, rue
de Varembé, CH-1211 Geneva 20, Switzerland or via the ISO website at
http://www.iso.ch/iso/en/ISOOnline.frontpage)
If this document is printed it becomes uncontrolled. Check for the latest revision.
Page 2
SPECIFICATION RT-350 ISSUE 17
3.
3.1
REQUIREMENTS
MATERIALS
The tubing shall be fabricated from thermally stabilized, modified polyolefin and shall be crosslinked by
irradiation. It shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams,
cracks, and inclusions.
3.2
PROPERTIES
The tubing shall meet the requirements of Table 3.
4.
4.1
4.1.1
QUALITY ASSURANCE PROVISIONS
CLASSIFICATION OF TESTS
Qualification Tests
Qualification tests are those performed on tubing submitted for qualification as a satisfactory product 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 be: dimensions, longitudinal change, tensile strength, ultimate elongation, secant modulus, flammability
(Type 1 only), and heat shock. Statistical process control data may be used to demonstrate conformance for
dimensions.
4.2
4.2.1
SAMPLING INSTRUCTIONS
Qualification Test Samples
Qualification test samples shall consist of 50 feet
(15 m)
of black, white and clear tubing. Qualification of
black and white shall qualify all colors. Clear shall be qualified separately. Qualification of any size within
each size range specified below shall qualify all sizes within that size range.
Range of Sizes
3/64 through 1/4
3/8 through 1
1-1/4 through 5
4.2.2
Acceptance Test Sample
Acceptance test samples shall consist of not less than 16 feet
(5 m)
of tubing selected at random from each
compound batch or the first sleeving production lot of the batch compound. Physical property tests
performed at this time qualify subsequent sleeving lots produced from the same compound batch.
4.3
TEST PROCEDURES
Condition test specimens and measurement gauges at 23 ± 3°C
(73 ± 5°F)
and ambient relative humidity
prior to all testing, whether before or after heat shrinking. Unless otherwise specified, perform tests on
specimens which have been fully recovered by conditioning for 3 minutes in a 200 ± 5°C
(392 ± 9°F)
oven.
Use mechanical convection type ovens in which air passes the specimens at a velocity of 100 to 200 feet
(30
to 60 m)
per minute.
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SPECIFICATION RT-350 ISSUE 17
4.3.1
Dimensions and Longitudinal Change
Page 3
Measure three 6-inch
(150 mm)
specimens of tubing, as supplied, for length ± 1/32 inch
(± 1 mm),
and inside diameter in accordance with ASTM D 2671. Condition the specimens for 3 minutes in
a 200 ± 5°C
(392 ± 9°F)
oven, cool to 23 ± 3°C
(73 ± 5°F)
and then remeasure. Prior to and after
conditioning, the dimensions of the tubing shall be in accordance with Table 1 and the longitudinal change
shall be in accordance with Table 3. Calculate the longitudinal change as follows:
C =
Where:
L1 - L0
x 100
L0
C = Longitudinal Change [Percent]
L0 = Length Before Conditioning [Inches
(mm)]
L1 = Length After Conditioning [Inches
(mm)]
4.3.2
Tensile Strength and Ultimate Elongation
Determine the tensile strength and ultimate elongation of the tubing in accordance with ASTM D 2671 using
1-inch
(25-mm)
bench marks, a 1-inch
(25-mm)
initial jaw separation, and jaw separation speed of 20 ± 2
inches
(500 ± 50 mm)
per minute.
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 defects and resubmitted for acceptance. Before resubmitting, full particulars concerning previous
rejection and action taken to correct the defects shall be furnished to the inspector.
5.
5.1
PREPARATION FOR DELIVERY
FORM
The tubing shall be supplied on spools or in lengths of 48 +1, -0 inches
(1220 +25.4, -0 mm)
unless
otherwise specified.
5.2
PACKAGING
Packaging shall be in accordance with good commercial practice.
5.3
MARKING
Each container of tubing shall be permanently and legibly marked with the size, quantity, manufacturer's
identification, specification number, and lot number.
If this document is printed it becomes uncontrolled. Check for the latest revision.
Page 4
SPECIFICATION RT-350 ISSUE 17
TABLE 1
Tubing Dimensions
As Supplied
Inside Diameter
Minimum
mm.
in.
.046
1.17
.063
1.60
.093
2.36
.125
3.17
.187
4.74
.250
6.35
.375
9.50
.500
12.70
.750
19.05
1.000
25.40
1.250
31.75
1.500
38.10
2.000
50.80
3.000
76.20
4.000
101.60
5.000
127.00
As Recovered
Wall Thickness
Minimum
Maximum
mm.
mm.
in.
in.
.013
0.33
.019
0.48
.014
0.35
.020
0.50
.017
0.43
.023
0.58
.017
0.43
.023
0.58
.017
0.43
.023
0.58
.022
0.56
.028
0.71
.022
0.56
.028
0.71
.022
0.56
.028
0.71
.027
0.69
.033
0.84
.030
0.76
.040
1.01
.034
0.86
.046
1.17
.034
0.86
.046
1.17
.038
0.96
.052
1.32
.042
1.06
.058
1.47
.046
1.16
.064
1.63
.051
1.30
.069
1.75
Size
3/64
1/16
3/32
1/8
3/16
1/4
3/8
1/2
3/4
1
1-1/4
1-1/2
2
3
4
5
Inside Diameter
Maximum
mm.
in.
.023
0.58
.031
0.79
.046
1.17
.062
1.57
.093
2.36
.125
3.17
.187
4.74
.250
6.35
.375
9.50
.500
12.70
.625
14.30
.750
19.05
1.000
25.40
1.500
38.10
2.000
50.80
2.500
63.50
Nominal
mm.
in.
.016
0.40
.017
0.43
.020
0.50
.020
0.50
.020
0.50
.025
0.64
.025
0.64
.025
0.64
.030
0.76
.035
0.88
.040
1.01
.040
1.01
.045
1.14
.050
1.27
.055
1.39
.060
1.52
TABLE 2
Mandrel Dimensions for Bend Testing
Tubing Size
3/64 to 1/4 inclusive
3/8 to 5 inclusive
Mandrel Diameter
mm.
in.
5/16
7.9
3/8
9.5
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SPECIFICATION RT-350 ISSUE 17
Page 5
TABLE 3
Requirements
REQUIREMENT
TYPE 1
TYPE 2
In accordance
with Table 1
+0, -5
1500 minimum
(10.3)
200 minimum
2.5 x 104
maximum
(172)
1.35 maximum
No cracking
No dripping,
flowing or
cracking
---
150 minimum
MIL-STD-104
MIL-STD-104
500 minimum
(19,680)
1014 minimum
No removal of
copper
No pitting or
blackening of
copper
No brittleness,
glazing,
cracking, or
severe
discoloration of
tubing
200 minimum
In accordance
with Table 1
+0, -5
1500 minimum
(10.3)
200 minimum
2.5 x 104
maximum
(172)
1.0 maximum
No cracking
No dripping,
flowing or
cracking
---
150 minimum
---
---
500 minimum
(19,680)
1016 minimum
No removal of
copper
No pitting or
blackening of
copper
No brittleness,
glazing,
cracking, or
severe
discoloration of
tubing
200 minimum
PROPERTY
PHYSICAL
Dimensions
Longitudinal Change
Tensile Strength
Ultimate Elongation
Secant Modulus (Expanded)
UNIT
Inches
(mm)
Percent
psi
(MPa)
Percent
psi
(MPa)
TEST METHOD
Section 4.3.1
ASTM D 2671
Section 4.3.2
ASTM D 2671
ASTM D 2671
Specific Gravity
Low Temperature Flexibility
4 hours at -55 ± 1°C
(-67 ± 2°F)
Heat Shock
4 hours at 250 ± 3°C
(482 ± 5°F)
Heat Resistance
168 hours at 175 ± 2°C
(347 ± 4°F)
Followed by test for:
Ultimate Elongation
Color
Color Stability
48 hours at 175 ± 2°C
(347 ± 4°F)
ELECTRICAL
Dielectric Strength
Volume Resistivity
---
---
---
---
Percent
---
---
Volts/mil
(volts/mm)
ohm-cm
ASTM D 2671
Table 2
ASTM D 2671
Procedure C
Table 2
ASTM D 2671
ASTM D 2671
MIL-STD-104
ASTM D 2671
NOTE 1
ASTM D 2671
ASTM D 2671
ASTM D 2671
Procedure A
ASTM D 2671
Procedure B
-
CHEMICAL
Copper Mirror Corrosion 16 hours at 175 ± --
2°C
(347 ± 4°F)
Copper Contact Corrosion
---
168 hours at 160 ± 2°C
(320 ± 4°F)
Copper Stability
168 hours at 160 ± 2°C
(320 ± 4°F)
---
Followed by test for:
Ultimate Elongation
Percent
If this document is printed it becomes uncontrolled. Check for the latest revision.
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