Tyco Electronics Corporation 300 Constitutional Drive Menlo Park, CA 94025 USA Specification This Issue: Date: Replaces: RT-1316 Issue 2 December 15, 1982 Issue 1 THERMOFIT(R) POLYOLEFIN MOLDED COMPONENTS Flame-Resistant, Flexible, Heat-Shrinkable 1. SCOPE This specification covers the requirements of one type of flexible, electrical insulating molded component whose diameter 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 MIL-H-5606 MIL-T-5624 MIL-L-7808 MIL-STD-105 2.2 Gasoline, Aviation, Grades 80/87, 100/130, 115/145 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance Turbine Fuel, Aviation, Grades JP-4 and JP-5 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base Sampling Procedures and Tables for Inspection by Attributes OTHER PUBLICATIONS American Society for Testing and Materials (ASTM) ASTM D 149 Standard Methods of Test for Dielectric Breakdown Voltage and Dielectric Strength of Electrical Insulating Materials at Commercial Power Frequencies ASTM D 257 Standard Methods of Test for D-C Resistance or Conductance of Insulating Materials ASTM D 412 Standard Method of Test for Rubber Properties in Tension ASTM D 570 Standard Methods of Test for Water Absorption of Plastics If this document is printed it becomes uncontrolled. Check for the latest revision. Page 2 SPECIFICATION RT-1316 ISSUE 2 ASTM D 635 ASTM D 747 ASTM D 792 ASTM D 2240 ASTM D 2671 ASTM G 21 Standard Methods of Test for Rate of Burning and/or Extent and Time of Burning of Self-Supporting Plastics in a Horizontal Position Standard Methods of Test for Stiffness of Plastics by Means of a Cantilever Beam Standard Methods of Test for Specific Gravity and Density of Plastics by Displacement Standard Methods of Tests for Rubber Property-Durometer Hardness Standard Methods of Testing Heat-Shrinkable Tubing for Electrical Use 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, 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. 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 components submitted for acceptance under contract. Acceptance tests shall consist of the following: dimensions, dimensional recovery, tensile strength, ultimate elongation, heat shock and flammability. If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-1316 ISSUE 2 Page 3 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 .25 mm), and the number of molded components specified. The molded slabs shall be fabricated from the same lot of material and shall be subject 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 2C (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 (5l-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 line 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 2C (302 4F) oven, or equivalent, and the distance between gage lines then shall be measured and recorded as the retracted length. Expansion and retraction shall be calculated as follows: E = Le - Lo x 100 Lo Le - Lr R = L - L x 100 e o Where: E R Lo Le Lr = = = = = Expansion (percent) Retraction (percent) Original Length [inches (mm)] Extended Length [inches (mm)] Retracted Length [inches (mm)] If this document is printed it becomes uncontrolled. Check for the latest revision. Page 4 4.3.3 SPECIFICATION RT-1316 ISSUE 2 Tensile Strength and Ultimate Elongation Three specimens cut from a molded slab using Die D of ASTM D 412 shall be tested for tensile strength and ultimate elongation in accordance with ASTM D 412. 4.3.4 Low Temperature Flexibility Three 6 x 1/4-inch (152 x 6.3-mm) specimens cut from a molded slab shall be conditioned, along with a 11/8-inch (28.5-mm) mandrel, in a cold chamber at -55 2C (-67 4F) for 4 hours. After completion of the conditioning, and while still in the cold chamber, each specimen shall be bent around the mandrel through not less than 360 degrees (6.28 rads) within 10 2 seconds. The specimens then shall be visually examined for cracks. 4.3.5 Heat Shock Three 6 x 1/4-inch (152 x 6.3-mm) specimens cut from a molded slab shall be conditioned for 4 hours in a 250 5C (482 9F) mechanical convection oven with an air velocity of between 100 and 200 feet per minute (0.5 and 1 m/s) past the specimens. After conditioning, the specimens shall be removed from the oven, cooled to room temperature, and bent through 360 degrees (6.38 rads) over a 3/8-inch (9.5-mm) diameter mandrel. The specimens then shall be visually examined for evidence of dripping, flowing or cracking. 4.3.6 Heat Aging Three specimens prepared and measured in accordance with 4.3.3 shall be conditioned for 168 hours in a 175 5C (347 9F) mechanical convection oven in which air passes the specimens at a velocity of 100 to 200 feet per minute (0.5 and 1 m/s). After conditioning, the specimens shall be removed from the oven, cooled to room temperature, and tested for tensile strength and ultimate elongation in accordance with 4.3.3. 4.3.7 Corrosive Effect Three 1 x 1/4-inch (25.4 x 6.3-mm) specimens cut from a molded slab shall be tested for corrosive effect in accordance with ASTM D 267l, Procedure A. The specimens shall be conditioned for 16 hours at 175 3C (347 5F). If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-1316 ISSUE 2 4.3.8 Page 5 Fluid Resistance Three specimens prepared and measured in accordance with 4.3.3 shall be completely immersed in each of the fluids listed in Table 1 for 24 hours at 25 3C (77 5F). The volume of the fluid shall be not less than 20 times that of the specimens. After conditioning, the specimens shall be lightly wiped and then air-dried for 30 to 60 minutes at room temperature. The specimens then shall be tested for tensile strength and ultimate elongation in accordance with 4.3.3. 4.4 REJECTION AND RETEST Failure of any sample to comply with any one of the requirements of this specification shall be cause for rejection of the lot represented. Material 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 The molded components shall be packaged in accordance with good commercial practice. The exterior shipping container shall be not less than 125 pound test fiberboard. 5.2 MARKING Each molded component shall be distinctly identified with the manufacturer's name or symbol and the manufacturer's part number. If this document is printed it becomes uncontrolled. Check for the latest revision. Page 6 SPECIFICATION RT-1316 ISSUE 2 TABLE 1 REQUIREMENTS PROPERTY PHYSICAL Dimensions UNIT REQUIREMENTS TEST METHOD Inches (mm) Dimensional Recovery Inches (mm) Elastic Memory Percent Section 4.3.1 ASTM D 2671 Section 4.3.1 ASTM D 2671 Section 4.3.2 Tensile Strength Ultimate Elongation Stiffness Specific Gravity Hardness Low Temperature Flexibility 4 hours at -55C (-67F) Heat Shock 4 hours at 250C (482F) Heat Aging 168 hours at 175C (347F) Followed by tests for: Tensile Strength Ultimate Elongation ELECTRICAL Dielectric Strength Volume Resistivity psi (MPa) Percent psi (MPa) --Shore D --- In accordance with specification control drawing In accordance with specification control drawing 275 expansion minimum 93 retraction minimum 1500 minimum (10.3) 250 minimum 12,000 max. (82.7) 1.40 max. 40 10 No cracking Section 4.3.3 ASTM D 412 ASTM D 747 ASTM D 792 ASTM D 2240 Section 4.3.4 --- No dripping, flowing or cracking Section 4.3.5 --- --- Section 4.3.6 psi (MPa) Percent Volts/mil (kV/mm) ohm-cm 1000 minimum (6.9) 200 minimum 200 minimum (7.9) Section 4.3.3 Section 4.3.3 ASTM D 149 1012 minimum ASTM D 257 --- Non-Corrosive Section 4.3.7 ASTM D 2671 Procedure A Seconds Inches (mm) --Percent 90 maximum 1 maximum (25.4) Rating of 1 or less 0.5 max. ASTM D 635 ASTM G 21 ASTM D 570 --- --- Section 4.3.8 psi (MPa) Percent 750 min. (5.2) 200 min. Section 4.3.3 CHEMICAL Corrosive Effect 16 hours at 175C (347F) Flammability Average Time of Burning Average Extent of Burning Fungus Resistance Water Absorption 24 hours at 25C (77F) Fluid Resistance 24 hours at 25C (77F) 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 Monsanto Company If this document is printed it becomes uncontrolled. Check for the latest revision.