Tyco Electronics Corporation Specification RT-1171 300 Constitutional Drive This Issue: Issue 7 Menlo Park, CA 94025 USA Date: December 5, 2001 Replaces: Issue 6 Thermofit MIL-LT Tubing Low Shrink-Temperature Polyolefin, Flexible, Heat-Shrinkable 1. SCOPE This specification covers requirements for flexible electrical insulating, extruded tubing whose diameter will reduce to a predetermined size upon the application of heat in excess of 90C (194F). 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 specifications to the extent specified herein. 2.1 GOVERNMENT-FURNISHED DOCUMENTS Military MIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance Mil-DTL-83133 Turbine Fuels, Aviation, Kerosene Types, NATO F-34 (JP-8), NATO F-35 and JP-8+100 MIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-STD-104 Limits for Electrical Insulation Color MIL-A-8243 Anti-icing and deicing-Defrosting Fluids MIL-L-23699 Lubricating Oil, Aircraft Turbine Engines, Synthetic Base 2.2 OTHER PUBLICATIONS ISO 846 Plastics-Evaluation of the action of microorganisms American Society for Testing and Materials (ASTM) D 2240 Standard Test Method for Rubber Property - Durometer Hardness 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.) 3. REQUIREMENTS 3.1 MATERIALS The tubing shall be fabricated form 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. 3.3 COLOR The tubing shall be available in black, white, red, yellow or blue, unless otherwise specified. If this document is printed it becomes uncontrolled. Check for the latest revision. Page 2 SPECIFICATION RT-1171 ISSUE 7 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 Low Temperature Flexibility 4.2 SAMPLING INSTRUCTIONS 4.2.1 Qualification Test Samples Qualification test samples shall consist of 50 feet (125 m) of black and white tubing. Qualification of black and white shall qualify all colors. Qualification of any size within each size range specified below shall qualify all sizes within that size range. Size Range 3/64 through 1/8 3/16 through 3/4 1 through 4 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, perform tests on specimens which have been fully recovered by conditioning for 3 minutes in a 200 5C (392 9F) oven. Condition the test specimens (and measurement gauges, when applicable) for 3 hours at 23 3C (73 5F) and 50 5 percent relative humidity for 3 hours prior to all testing. 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. 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 3 minutes in a 200 5C (392 9F) oven, cool to 23 3C (73 + 5F), 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: L - L 1 0 C = x 100 L 0 Where: C = Longitudinal Change percent L = Length Before Conditioning inches (mm) 0 L = Length After Conditioning inches (mm) 1 If this document is printed it becomes uncontrolled. Check for the latest revision.