Tyco Electronics Corporation Specification RT-1304 300 Constitutional Drive This Issue: Issue 3 Menlo Park, CA 94025 USA Date: April 17, 1995 Replaces: Issue 2 Thermofit Polyolefin Molded Components Flame-Retarded. Flexible, Heat-Shrinkable 1. SCOPE This specification covers the requirements for one type of flexible, electrical insulating molded component whose expanded dimensions will reduce to a predetermined size upon the application of heat in excess of 100C (212F). 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-G-5572 Gasoline, Aviation, Grades 80/87, 100/130, 115/145 MIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance MIL-T-5624 Turbine Fuel, Aviation, Grades JP-4 and JP-5 MIL-STD-105 Sampling Procedures and Tables for Inspection by Attributes 2.2 OTHER PUBLICATIONS American Society for Testing and Materials (ASTM) D 149 Standard Methods of Tests for Dielectric Breakdown Voltage and Dielectric Strength of Electrical Insulating Materials at Commercial Power Frequencies D 257 Standard Methods of Test for D-C Resistance or Conductance of Insulating Material. D 412 Standard Method of Tests for Rubber Properties in Tension D 570 Standard Methods of Test for Water Absorption of Plastics D 635 Standard Methods of Test for Rate of Burning and/or Extent and Time of Burning of Self-Supporting Plastics in a Horizontal Position D 747 Standard Methods of Test for Stiffness of Plastics by Means of a Cantilever Beam D 792 Standard Methods of Test for Specific Gravity and Density of Plastics by Displacement D 2240 Standard Method of Tests for Rubber Property-Durometer Hardness D 2671 Standard Methods of Testing Heat Shrinkable Tubing for Electrical Use 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 molded components shall be fabricated from a crosslinked, thermally stabilized, flame resistant, modified polyolefin composition. They 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 SPECIFICATION RT-1304 ISSUE 3 3.2 COLOR The molded components shall be black. 3.3 PROPERTIES The molded components and the material from which they are fabricated shall meet the requirements of Table 1. 4. QUALITY ASSURANCE PROVISIONS 4.1 CLASSIFICATION OF TESTS 4.1.1 Qualification Tests Qualification tests are those performed on molded slabs and components 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 molded slabs and components submitted for acceptance under contract. Acceptance tests shall consist of the following: dimensional recovery, tensile strength, ultimate elongation, heat shock, and flammability. 4.2 SAMPLING INSTRUCTIONS 4 2.1 Qualification Test Samples Qualification test samples shall consist of six molded slabs, 6 x 6 x 0.075 + 0.010 inches (152 x 152 x 1.9 + .25mm) and the number of molded components specified. The molded slabs shall be fabricated from the same lot of material and shall be subjected to the same degree of crosslinking as the molded components. 4.2.2 Acceptance Test Samples Acceptance test samples shall consist of specimens cut from a molded slab 6 x 6 x 0.075 + 0.010 inches (152 x 152 x 1.9 + .25 mm), and molded components selected at random in accordance with MIL-STD- 105, Inspection Level S-2, AQL 6.5 percent. The molded slab shall be fabricated from the same lot of material and shall be subjected to the same degree of crosslinking as the molded components. A lot of components shall consist of all molded components from the same lot of material, from the same production run, and offered for inspection at the same time. 4.3 TEST PROCEDURES 4.3.1 Dimensional Recovery Samples of molded components, as supplied, shall be measured for dimensions in accordance with ASTM D 2671. The samples then shall be conditioned for 10 minutes in a 150 + 2 C (302 + 4F) oven, or equivalent, cooled to room temperature and remeasured. 4.3.2 Elastic Memory A 6 x 1/8-inch (152 x 3.2-mm) specimen cut from a molded slab shall be marked with two parallel gage lines 1 inch (25 mm) apart in the central portion of the specimen. The distance between gage lines shall be recorded as the original length. A 2-inch (51-mm) portion of the specimen including both gage lines then shall be heated for 1 minute in a 150 + 2C (302 + 4F) oven, or equivalent, removed from the oven and stretched within 10 seconds, until the gage lines are 4 inches (102 mm) apart. The extended specimen shall be cooled to room temperature and released from tension. After 24 hours at room temperature, the distance between the gage lines shall be measured and recorded as the extended length. The portion of the specimen including both gage lines then shall be reheated for 1 minute in a 150 + 2 C (302 + 4F) oven, or equivalent, and the distance between gage lines then shall be measured and recorded as the retracted length. If this document is printed it becomes uncontrolled. Check for the latest revision.