Tyco Electronics Corporation 300 Constitution Drive Menlo Park, CA 94025 USA Specification This Issue: Date: Replaces: RT-1312 Issue 4 January 17, 2005 Issue 3 RAYCHEM FLUORO ELASTOMER 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 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-G-5572 MIL-H-5606 MIL-L-7808 MIL-T-5624 2.2 Gasoline, Aviation, Grades 80/87, 100/130, 115/145 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance Lubricating Oil, Aircraft Turbine Engine, Synthetic Base Turbine Fuel, Aviation, Grades JP-4, JP-5 and JP5/JP8. 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 Materials 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 SelfSupporting Plastics in a Horizontal Position 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 form the American Society for Testing and Materials, 1916 Race Street, Philadelphia, Pennsylvania 19103.) If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved Page 2 SPECIFICATION RT-1312 ISSUE 4 3. REQUIREMENTS 3.1 MATERIAL The molded components shall be fabricated from a crosslinked, thermally stabilized, flame-retarded, modified fluoroelastomeric 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 slabs and components submitted for acceptance under contract. Acceptance tests shall consist of the following: Dimensional Recovery Tensile Strength Ultimate Elongation Heat Shock Hardness Flammability If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved SPECIFICATION RT-1312 ISSUE 4 4.2 SAMPLING INSTRUCTIONS 4.2.1 Qualification Test Samples Page 3 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 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. 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 Dimensions and 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 200 3C (392 5F) oven, or equivalent, cooled to room temperature and re-measured. 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 gauge lines 1 inch (25 mm) apart in the central portion of the specimen. The distance between gauge lines shall be recorded as the original length. A 2-inch (51-mm) portion of the specimen including both gauge lines then shall be heated for 1 minute in a 200 2C (392 4F) oven, or equivalent, removed from the oven and stretched within 10 seconds, until the gauge 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 gauge lines shall be measured and recorded as the extended length. The portion of the specimen including both gauge lines then shall be reheated for 1 minute in a 200 2C (392 4F) oven, or equivalent, and the distance between gauge 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 If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved Page 4 SPECIFICATION RT-1312 ISSUE 4 Where: 4.3.3 E = Expansion (percent) R = Retraction (percent) Lo = Original Length [inches (mm)] Le = Extended Length [inches (mm)] Lr = Retracted Length [inches (mm)] Tensile Strength, Tensile Stress and Ultimate Elongation Three specimens cut from a molded slab using Die D of ASTM D 412 shall be tested for tensile strength, tensile stress 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 1.125-inch (28.6 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 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 300 5C (572 9F) mechanical convection oven with an air velocity of from 100 to 200 feet per minute past the specimens. After conditioning, the specimens shall be removed from the oven, cooled to room temperature, and bent through 360 degrees 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 250 3C (482 5F) mechanical convection oven with an air velocity of 100 to 200 feet per minute past the specimens. 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 2671, Procedure A. The specimens shall be conditioned for 16 hours at 160 3C (320 5F). 4.3.8 Fluid Resistance Three specimens prepared and measured in accordance with 4.3.3 shall be completely immersed in the test fluids listed in Table 1 for 24 hours at the specified temperatures. 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 airdried 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. If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved SPECIFICATION RT-1312 ISSUE 4 4.3.9 Page 5 Flammability Prepare the specimen for the horizontal burn test in accordance with ASTM D 635. Report results in accordance with ASTM D 635. Additionally, if the flame front fails to reach the 25mm mark, record the average total time to self-extinguish the flame and glow of the specimen [ (tn-30)/number of specimens] and the average total distance charred by the flame, measured from the 100 mm mark on the specimen, subtracting the measurement from 100 to get the resulting burned length. A passing result is automatically achieved when the flame self extinguishes prior to reaching the 25mm mark. 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 Packaging of molded components shall be in accordance with good commercial practice. The shipping container shall be not less than 125 pound test fiberboard. 5.2 MARKING Each molded component shall be distinctly identified on the part and/or package with the manufacturing name or symbol, the manufacturer's part number, lot number, date of manufacture, and use before date. If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved Page 6 SPECIFICATION RT-1312 ISSUE 4 TABLE 1 Requirement PROPERTY PHYSICAL Dimensions UNIT REQUIREMENTS TEST METHOD Inches (mm) Section 4.3.1 ASTM D 2671 Dimensional Recovery Inches (mm) Elastic Memory Percent Tensile Strength Tensile Stress at 100% elongation Ultimate Elongation Specific Gravity Hardness Low Temperature Flexibility 4 hours at -55C (-67F) Heat Shock 4 hours at 300C (572F) Heat Aging 168 hours at 250C (482F) Followed by tests for: Tensile Strength Elongation ELECTRICAL Dielectric Strength psi (MPa) psi (MPa) Percent --Shore A --- In accordance with applicable specification control drawing In accordance with applicable specification control drawing 200 minimum expansion 90 minimum retraction 1800 minimum (12.4) 1200 (8.3) maximum 300 minimum 1.95 maximum 85 5 No cracking --- No dripping, flowing or cracking Section 4.3.5 --- --- Section 4.3.6 psi (MPa) Percent 1200 minimum (8.3) 250 minimum Section 4.3.3 Volts/mil (kV/mm) ohm-cm 200 (3.1) minimum ASTM D 149 1010 minimum ASTM D 257 --- Non-corrosive Seconds Inches (mm) --Percent 60 maximum 1.0 (25.4) maximum Rating of 1 or less 0.5 maximum --- --- Section 4.3.8 psi (MPa) Percent 1600 minimum (11.0) 200 minimum Section 4.3.3 Volume Resistivity CHEMICAL Corrosive Effect 16 hours at 160C (320F) Flammability Average Time of Burning and Glowing Average Extent of Burning Fungus Resistance Water Absorption 24 hours at 23C (73F) Fluid Resistance 24 hours at 23C (73F) Aviation Gasoline 100/300 (MIL-G-5572) JP-8 Fuel (MIL-T-5624) 24 hours at 93C (200F) Lubricating Oil (MIL-L-7808) Hydraulic Fluid (MIL-H-5606) Water Followed by tests for: Tensile Strength Elongation If this document is printed it becomes uncontrolled. Check for the latest revision. (c)2005 Tyco Electronics Corporation. All rights reserved Section 4.3.2 Section 4.3.3 ASTM D 412 ASTM D 792 ASTM D 2240 Section 4.3.4 Section 4.3.7 ASTM D 2671 Procedure A ASTM D 635, and Section 4.3.9 ASTM G 21 ASTM D 570