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(R) 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 175C (347F). 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 MIL-G-5572 MIL-L-7808 MIL-T-5624 2.2 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance Gasoline, Aviation, Grades 80/87, 100/130 and 115/145 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base Turbine Fuel, Aviation, Grades JP-4 and JP-5 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. If this document is printed it becomes uncontrolled. Check for the latest revision. Page 2 3.2 SPECIFICATION RT-1140 ISSUE 5 COLOR Unless otherwise specified, the tubing shall be black. 3.3 PROPERTIES The tubing shall meet the requirements of Table 3. 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 3C (347 5F). Prior to all testing, condition the test specimens (and measurement gauges, when applicable) for 3 hours at 23 3C (73 5F) 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. If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-1140 ISSUE 5 4.3.1 Page 3 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 5C (347 9F) oven, cool to 23 3C (73 5F) 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 = Where: 4.3.2 L1 - L0 x 100 L0 C = Longitudinal Change [Percent] L = Length Before Conditioning [Inches (mm)] 0 L = Length After Conditioning [Inches (mm)] 1 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. If this document is printed it becomes uncontrolled. Check for the latest revision. Page 4 SPECIFICATION RT-1140 ISSUE 5 TABLE 1 Tubing Dimensions Size 1/4 3/8 1/2 5/8 3/4 7/8 1 1-1/4 1-1/2 1-3/4 2 As Recovered Inside Diameter Minimum mm. in. .250 6.35 .375 9.52 .500 12.70 .625 15.87 .750 19.05 .875 22.22 1.000 25.40 1.250 31.75 1.500 38.10 1.750 44.45 2.000 50.80 Inside Diameter Maximum mm. in. .143 3.63 .214 5.43 .286 7.25 .357 9.06 .428 10.87 .500 12.70 .570 14.47 .714 18.13 .857 21.76 1.000 25.40 1.140 28.95 As Supplied Wall Thickness Minimum Maximum mm. mm. in. in. .025 0.63 .045 1.14 .030 0.76 .050 1.27 .033 0.83 .063 1.60 .037 0.93 .067 1.70 .042 1.06 .072 1.82 .050 1.27 .080 2.03 .050 1.27 .090 2.28 .067 1.70 .107 2.71 .075 1.90 .115 2.92 .087 2.20 .127 3.22 .090 2.28 .130 3.30 TABLE 2 Mandrel Dimensions Tubing Size 1/4 through 3/8 1/2 through 1-3/4 2 Mandrel Diameter mm. in. 3/8 9.5 7/16 11.1 7/8 22.2 If this document is printed it becomes uncontrolled. Check for the latest revision. Nominal mm. in. .035 0.88 .040 1.01 .048 1.21 .052 1.32 .057 1.44 .065 1.65 .070 1.77 .087 2.20 .095 2.41 .107 2.71 .110 2.79 SPECIFICATION RT-1140 ISSUE 5 Page 5 TABLE 3 Requirements PROPERTY PHYSICAL Dimensions UNIT REQUIREMENTS TEST METHOD inches In accordance with Table 1 Section 4.3.1 ASTM 2671 Longitudinal Change Tensile Strength Ultimate Elongation Tensile Stress at 100% elongation percent psi (MPa) percent psi (MPa) +3 -10 maximum 600 minimum (4.1) 200 minimum 1000 maximum (6.8) Specific Gravity Hardness (Sizes 1/2" or larger) Low Temperature Flexibility 4 hours at -75 2C (-103 4F --Shore A --- 1.35 maximum 60 5 No cracking Heat Shock 4 hours at 300 3C (572 5F) Heat Resistance 168 hours at 200 3C (392 5F) Followed by tests for: Tensile Strength Ultimate Elongation ELECTRICAL Dielectric Strength ----- No dripping, flowing or cracking of suspended specimens --- psi (MPa) percent 450 minimum (3.1) 100 minimum Section 4.3.2 volts/mil (v/mm) ohm-cm 350 minimum (13,800) ASTM D 2671 1011 minimum ASTM D 2671 --- Noncorrosive ASTM D 2671 Procedure A seconds percent --percent 60 maximum 25% maximum Rating of 1 or less 1.0 maximum ASTM D 2671 Procedure B ASTM G 21 ASTM D 2671 --- --- ASTM D 2671 psi (MPa) percent 250 minimum (1.7) 100 minimum Section 4.3.2 ASTM D 2671 Volume Resistivity CHEMICAL Corrosive Effect 16 hours at 175 2C (347 4F) Flammability Time of burning Flag burn Fungus Resistance Water Absorption 24 hours at 23 3C (73 5F) Fluid Resistance 24 hours at 23 3C (73 5F) 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: Tensile Strength Ultimate Elongation *Trademark of the Monsanto Company. If this document is printed it becomes uncontrolled. Check for the latest revision. Section 4.3.2 ASTM D 2671 Section 4.3.2 ASTM D 412 ASTM D 2671 ASTM D 2240 ASTM D 2671 Procedure C Table 2 ASTM D 2671 ASTM D 2671