Tyco Electronics Corporation 300 Constitutional Drive Menlo Park, CA 94025 USA Specification This Issue: Date: Replaces: RT-375 Issue 7 4 February 2004 Issue 6 THERMOFIT(R) RT-375 TUBING Fluoropolymer, Semi-Flexible, Clear, Flame Resistant, Heat-Shrinkable 1. SCOPE This specification covers the requirements for one type of flexible, flame resistant, electrical insulating, extruded tubing whose diameter will reduce to a predetermined size upon the application of heat in excess of 150C (302F). The tubing shall be flame resistant and shall be clear. 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 Federal O-S-1926 Sodium Chloride, Technical Military MIL-H-5606 Hydraulic Fluid, Petroleum Base, Aircraft, Missile and Ordnance MIL-T-83133 Turbine Fuel, Aviation, Grade JP-8 MIL-L-7808 Lubricating Oil, Aircraft Turbine Engine, Synthetic Base MIL-A-8243 Anti-icing and Deicing - Defrosting Fluid MIL-L-23699 Lubricating Oil, Aircraft Turbine Engines, Synthetic Base If this document is printed it becomes uncontrolled. Check for the latest revision. Page 2 2.2 SPECIFICATION RT-375 ISSUE 7 OTHER PUBLICATIONS American Society for Testing and Materials (ASTM) 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 or via the ASTM website at http://www.astm.org). International Organization for Standardization (ISO) ISO 846 Plastics - Evaluation of the action of Microorganisms (Copies of ISO publications may be obtained from the International Organization for Standardization, 1, rue de Varembe, CH-1211 Geneva 20, Switzerland or via the ISO website at http://www.iso.ch/iso/en/ISOOnline.frontpage) SAE International AMS-DTL-23053 Insulating Sleeving, Electrical, Heat Shrinkable, General Specification for (Copies of SAE publications may be obtained from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or via the SAE website at http://www.sae.org.) 3. REQUIREMENTS 3.1 MATERIALS The tubing shall be fabricated from thermally stabilized, modified fluoropolymer and shall be crosslinked by irradiation. It shall be homogeneous and essentially free from flaws, defects, pinholes, bubbles, seams, cracks, and contaminants. 3.2 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. If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-375 ISSUE 7 4.1.2 Page 3 Acceptance Tests Acceptance tests are those performed on tubing submitted for acceptance under contract. Acceptance tests shall be: Dimensions Longitudinal Change Concentricity Tensile Strength Ultimate Elongation Secant Modulus Low Temperature Flexibility Flammability Heat Shock Clarity Stability Statistical process control data may be used to demonstrate conformance for dimensions. 4.2 SAMPLING INSTRUCTIONS 4.2.1 Qualification Test Samples Qualification test samples shall consist of 50 feet (15 m) of tubing. Qualification of any size within each size range specified below shall qualify all sizes within that size range. Range of Sizes 3/64 through 1/4 3/8 through 2 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 compound batch or the first sleeving production lot of the batch compound. Physical property tests performed at this time qualify subsequent sleeving lots produced from the same compound batch. 4.2.3 Lot Formation 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 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. If this document is printed it becomes uncontrolled. Check for the latest revision. Page 4 4.3.1 SPECIFICATION RT-375 ISSUE 7 Low Temperature Flexibility For tubing of expanded diameter less than 1/4 inch (6 mm), cut three tubular specimens, 12 inches (300 mm) long, from the expanded tubing. For tubing of expanded diameter 1/4 inch (6 mm) or greater, cut three strip specimens, 1/4 inch (6 mm) wide and 12 inches (300 mm) long, from the expanded tubing. Recover the specimens in accordance with Section 4.3 and condition with appropriate mandrels for 4 hours at -55 2C (-67 4F). The mandrel diameter shall be 10 times the specimen thickness, 10 percent. For tubular specimens, the specimen thickness shall be equivalent to the outside diameter. While at the specified temperature, and without removing the specimens from the cold chamber, wrap the specimens 360 around the mandrel in approximately 2 seconds. Disregard any side cracking, caused by flattening of the specimens on the mandrel. 4.4 REJECTION AND RETEST Failure of any sample of tubing to conform to 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 defects and resubmitted for acceptance. Before resubmitting, full particulars concerning previous rejection and action taken to correct the defects shall be furnished to the inspector. 5. PREPARATION FOR DELIVERY 5.1 FORM The tubing shall be supplied on spools, unless otherwise specified. 5.2 PACKAGING Packaging shall be in accordance with good commercial practice. 5.3 MARKING Each container of tubing shall be permanently and legibly marked with the size, quantity, manufacturer's name, product name, and lot number. If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-375 ISSUE 7 Page 5 TABLE 1 Tubing Dimensions Size 3/64 1/16 3/32 1/8 3/16 1/4 3/8 1/2 3/4 1 1-1/2 2 As Supplied Inside Diameter Minimum mm. in. .046 1.17 .063 1.60 .093 2.36 .125 3.17 .187 4.74 .250 6.35 .375 9.50 .500 12.70 .750 19.05 1.000 25.40 1.500 38.10 2.000 50.80 Inside Diameter Maximum mm. in. .023 0.58 .031 0.79 .046 1.17 .062 1.57 .093 2.36 .125 3.17 .187 4.74 .250 6.35 .375 9.50 .500 12.70 .750 19.05 1.000 25.40 As Recovered Wall Thickness Minimum Maximum mm. mm. in. in. .008 0.20 .012 0.30 .008 0.20 .012 0.30 .008 0.20 .012 0.30 .008 0.20 .012 0.30 .008 0.20 .012 0.30 .009 0.23 .015 0.38 .009 0.23 .015 0.38 .009 0.23 .015 0.38 .014 0.36 .020 0.51 .016 0.41 .022 0.56 .017 0.43 .023 0.58 .017 0.43 .023 0.58 TABLE 2 Mandrel Dimensions for Bend Testing Tubing Size 3/64 to 1/4 inclusive 3/8 to 1/2 inclusive 3/4 to 2 inclusive Mandrel Diameter in. mm. 5/16 0.002 7.9 0.05 3/8 0.003 9.5 0.08 7/16 0.004 11.1 0.10 If this document is printed it becomes uncontrolled. Check for the latest revision. Nominal mm. in. .010 0.25 .010 0.25 .010 0.25 .010 0.25 .010 0.25 .012 0.30 .012 0.30 .012 0.30 .017 0.43 .019 0.48 .020 0.51 .020 0.51 Page 6 SPECIFICATION RT-375 ISSUE 7 TABLE 3 Requirements PROPERTY PHYSICAL Dimensions Longitudinal Change Tensile Strength Ultimate Elongation Concentricity (Expanded) Sizes 3/64 through 1 Sizes 1-1/2 and 2 Secant Modulus (Expanded) Specific Gravity Low Temperature Flexibility 4 hours at -55 2C (-67 4F) Heat Shock 4 hours at 250 3C (482 5F) Heat Resistance 336 hours at 225 3C (437 5F) Followed by test for: Ultimate Elongation Clarity Stability 24 hours at 200 3C (392 5F) ELECTRICAL Dielectric Strength Volume Resistivity CHEMICAL Copper Mirror Corrosion 16 hours at 160 2C (320 4F) Copper Contact Corrosion 16 hours at 160 2C (320 4F) Flammability Fungus Resistance Followed by tests for: Tensile Strength Ultimate Elongation Dielectric Strength Water Absorption 24 hours at 23 3C (73 5F) UNIT REQUIREMENT TEST METHOD Inches (mm) Percent psi (MPa) Percent In accordance with Table 1 +0, -10 3500 (24.1) minimum 300 minimum ASTM D 2671 Note 1 ASTM D 2671 Note 2 ASTM D 2671 Percent Percent psi (MPa) 70 minimum 60 minimum 2.5 x 104 (172) minimum ASTM D 2671 ----- 1.90 maximum No cracking ASTM D 2671 Section 4.3.1 --- No dripping, flowing or cracking Table 2 ASTM D 2671 ASTM D 2671 Percent --- 100 minimum Marking legible through tubing wall Volts/mil (volts/mm) ohm-cm 400 (15,760) minimum 1011 minimum --- Noncorrosive --- No pitting or blackening of copper Self-extinguishing within 1 minute, 25% maximum flag burn --- AMS-DTL-23053 ASTM D 2671 Note 3 ASTM D 2671 ASTM D 2671 Procedure A ASTM D 2671 Procedure B ASTM D 2671 Procedure C ISO 846 Method B psi (Mpa) percent Volts per mil (volts per mm) Percent 3500 minimum (24.1) 300 minimum 400 minimum (15,760) Note 2 ASTM D 2671 ASTM D 2671 0.5 maximum ASTM D 2671 If this document is printed it becomes uncontrolled. Check for the latest revision. SPECIFICATION RT-375 ISSUE 7 Page 7 TABLE 3 Requirements (continued) PROPERTY Fluid Resistance 24 hours at 50 3C (122 5F) in: JP-8 Fuel (MIL-T-83133) Hydraulic Fluid (MIL-H-5606) Lubricating Oil, (MIL-L-23699) Lubricating Oil, (MIL-L-7808) 5% NaCl, O-S-1926 De-icing Fluid (MIL-A-8243) Water Followed by tests for: Tensile Strength Ultimate Elongation Dielectric Strength UNIT --- REQUIREMENT --- TEST METHOD ASTM D 2671 Note 4 psi (MPa) 2000 (13.8) minimum Percent 250 Volts/mil 400 (15,760) minimum (volts/mm) NOTE 1: Condition the specimens for 3 minutes at 200 3C (392 5F) and cool to room temperature before final measurements. NOTE 2: Use 1-inch (25.4-mm) bench marks, 1-inch (25.4-mm) initial jaw separation, and 2 .2-inch (50 5-mm) jaw separation speed. NOTE 3: Recover the specimens on the metal mandrels for 10 minutes, minimum, at 175 2C (347 4F) or until the tubing is completely shrunk on the mandrels. NOTE 4: To measure the dielectric strength, immerse the recovered specimens in the fluids prior to inserting the mandrels into the wiped and dried specimens. If this document is printed it becomes uncontrolled. Check for the latest revision.