SFR-1-3/4-0-SP (5660174002) - Tyco Electronics

Tyco Electronics Corporation

300 Constitutional Drive

Menlo Park, CA 94025 USA

Specification

This Issue:

Date:

Replaces:

RT-1140

Issue 5

May 15, 2003

Issue 4

THERMOFIT® SFR TUBING

Modified Silicone Elastomer, Flame-Retarded, Heat-Shrinkable

1. SCOPE

This specification covers the requirements for a type of highly flexible, electrically insulating, extruded

tubing whose diameter will reduce to a predetermined size upon the application of heat in excess of 175°C

(347°F).

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

MIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance

MIL-G-5572 Gasoline, Aviation, Grades 80/87, 100/130 and 115/145

MIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base

MIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5

2.2 OTHER PUBLICATIONS

American Society for Testing and Materials (ASTM)

D 412 Standard Method of Tension Testing of Vulcanized Rubber

D 2240 Standard Method of Test for Indentation Hardness of Rubber and Plastics by Means of a

Durometer

D 2671 Standard Methods of Testing Heat-Shrinkable Tubing

G 21 Recommended Practice for Determining Resistance of Synthetic Polymeric Materials to

Fungi

(Copies of ASTM publications may be obtained from the American Society for Testing and Materials, 1916

Race Street, Philadelphia, Pennsylvania 19103.)

3. REQUIREMENTS

3.1 MATERIAL

The tubing shall be fabricated from a stabilized, flame-retarded, modified silicone elastomer and shall be

crosslinked. It shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams,

cracks, and inclusions.

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Page 2 SPECIFICATION RT-1140 ISSUE 5

3.2 COLOR

Unless otherwise specified, the tubing shall be black.

3.3 PROPERTIES

The tubing shall meet the requirements of Table 3.

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4. QUALITY ASSURANCE PROVISIONS

4.1 CLASSIFICATION OF TESTS

4.1.1 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 consist of the following:

Dimensions

Longitudinal Change

Tensile Strength

Ultimate Elongation

Flammability

Heat Shock

4.2 SAMPLING INSTRUCTIONS

4.2.1 Qualification Test Samples

Qualification test samples shall consist of 50 feet (15 m) of tubing of each size. Qualification of any size

within each size range specified below will qualify all sizes in the same range.

Size Range

1/4 through 7/8

1 through 2

4.2.2 Acceptance Test Samples

Acceptance test samples shall consist of not less than 16 feet (6 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, perform the tests on specimens that have been recovered by conditioning for 10

minutes at 175 ± 3°C (347 ± 5°F). Prior to all testing, condition the test specimens (and measurement

gauges, when applicable) 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.

SPECIFICATION RT-1140 ISSUE 5 Page 3

4.3.1 Dimensions and Longitudinal Change

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 10 minutes in a 175 ± 5°C (347 ±

9°F) oven, cool to 23 ± 3°C (73 ± 5°F) and 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 = L1 - L0

L0 x 100

Where: C = Longitudinal Change [Percent]

0 = Length Before Conditioning [Inches (mm)]

1 = Length After Conditioning [Inches (mm)]

4.3.2 Tensile Strength, Tensile Stress and Ultimate Elongation

Test three specimens of tubing for tensile strength and ultimate elongation in accordance with ASTM D

2671, and for tensile stress in accordance with ASTM D 412. 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 C of ASTM D

412. The specimens shall have 1-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 (50 mm) for die-cut

specimens. The rate of jaw separation shall be 20 ± 2 inches (500 ± 5 mm) per minute.

4.4 REJECTION AND RETEST

Failure of any sample of tubing to comply with 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 to the inspector.

5. PREPARATION FOR DELIVERY

5.1 PACKAGING

Packaging shall be in accordance with good commercial practice. The shipping container shall be not less

than 125-pound-test fiberboard.

5.2 MARKING

Each container of tubing shall be permanently and legibly marked with the size, quantity, manufacturer's

name, part number, specification number, lot number, date of manufacture and expiration date.

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Page 4 SPECIFICATION RT-1140 ISSUE 5

TABLE 1

Tubing Dimensions

As Recovered As Supplied

Inside Diameter Inside Diameter Wall Thickness

Size Minimum Maximum Minimum Maximum Nominal

in.

mm. in. mm. in. mm. in. mm. in. mm.

1/4 .250 6.35 .143 3.63 .025 0.63 .045 1.14 .035 0.88

3/8 .375 9.52 .214 5.43 .030 0.76 .050 1.27 .040 1.01

1/2 .500 12.70 .286 7.25 .033 0.83 .063 1.60 .048 1.21

5/8 .625 15.87 .357 9.06 .037 0.93 .067 1.70 .052 1.32

3/4 .750 19.05 .428 10.87 .042 1.06 .072 1.82 .057 1.44

7/8 .875 22.22 .500 12.70 .050 1.27 .080 2.03 .065 1.65

1 1.000 25.40 .570 14.47 .050 1.27 .090 2.28 .070 1.77

1-1/4 1.250 31.75 .714 18.13 .067 1.70 .107 2.71 .087 2.20

1-1/2 1.500 38.10 .857 21.76 .075 1.90 .115 2.92 .095 2.41

1-3/4 1.750 44.45 1.000 25.40 .087 2.20 .127 3.22 .107 2.71

2 2.000 50.80 1.140 28.95 .090 2.28 .130 3.30 .110 2.79

TABLE 2

Mandrel Dimensions

Tubing Size Mandrel Diameter

in.

mm.

1/4 through 3/8 3/8 9.5

1/2 through 1-3/4 7/16 11.1

2 7/8 22.2

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SPECIFICATION RT-1140 ISSUE 5 Page 5

TABLE 3

Requirements

PROPERTY UNIT REQUIREMENTS TEST METHOD

PHYSICAL

Dimensions

inches

In accordance with Table 1

Section 4.3.1

ASTM 2671

Longitudinal Change percent +3 -10 maximum

Tensile Strength psi (MPa) 600 minimum (4.1) Section 4.3.2

Ultimate Elongation percent 200 minimum ASTM D 2671

Tensile Stress at 100% elongation psi (MPa) 1000 maximum (6.8) Section 4.3.2

ASTM D 412

Specific Gravity --- 1.35 maximum ASTM D 2671

Hardness (Sizes 1/2" or larger) Shore A 60 ± 5 ASTM D 2240

Low Temperature Flexibility

4 hours at -75 ± 2°C (-103 ± 4°F

--- No cracking ASTM D 2671

Procedure C

Table 2

Heat Shock

4 hours at 300 ± 3°C (572 ± 5°F)

--- No dripping, flowing or cracking

of suspended specimens

ASTM D 2671

Heat Resistance

168 hours at 200 ± 3°C (392 ± 5°F)

Followed by tests for:

--- --- ASTM D 2671

Tensile Strength psi (MPa) 450 minimum (3.1) Section 4.3.2

Ultimate Elongation percent 100 minimum

ELECTRICAL

Dielectric Strength

volts/mil

(v/mm)

350 minimum (13,800)

ASTM D 2671

Volume Resistivity ohm-cm 1011 minimum ASTM D 2671

CHEMICAL

Corrosive Effect

16 hours at 175 ± 2°C (347 ± 4°F)

---

Noncorrosive

ASTM D 2671

Procedure A

Flammability

Time of burning

seconds

60 maximum

ASTM D 2671

Flag burn percent 25% maximum Procedure B

Fungus Resistance --- Rating of 1 or less ASTM G 21

Water Absorption

24 hours at 23 ± 3°C (73 ± 5°F)

percent 1.0 maximum ASTM D 2671

Fluid Resistance

24 hours at 23 ± 3°C (73 ± 5°F)

JP-4 Fuel (MIL-T-5624)

Skydrol* 500

Hydraulic Fluid (MIL-H-5606)

Aviation Gasoline (100/130)

(MIL-G-5572)

Lubricating Oil (MIL-L-7808)

Water

Followed by tests for:

--- --- ASTM D 2671

Tensile Strength psi (MPa) 250 minimum (1.7) Section 4.3.2

Ultimate Elongation percent 100 minimum ASTM D 2671

*Trademark of the Monsanto Company.

If this document is printed it becomes uncontrolled. Check for the latest revision.