if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved tyco electronics corporation 305 constitutional drive menlo park, ca 94025 usa raychem specification this issue: date: replaces: RT-1116 issue 5 october 19, 2012 issue 4 thermofit dr-25 tubing elastomeric, fluid resistant, abrasion resistant, flexible, heat-shrinkable 1. scope this specification covers the requirements for one type of highly flexible, electrical insulating, extruded tubing whose diameter will reduce to a predetermined size upon the application of heat in excess of 175c (347f) . 2. applicable documents this specification takes precedence ove r documents referenced herein. un less 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-prf-5606 hydraulic fluid, petroleum base, aircraft, missile, and ordnance mil-dtl-5624 turbine fuel, aviation, grades jp-4 and jp-5 mil-prf-6083 hydraulic fluid, petroleum base, for preservation and operation sae-ams1424 anti-icing and deicing - defrosting fluid mil-prf-23699f lubricating oil, aircraft turbine engines, synthetic base mil-prf-46170d hydraulic fluid, rust inhibited, fire-resistant, synthetic hydrocarbon base federal a-a-59133 cleaning compound, high pressure (steam) cleaner a-a-52557 fuel oil, diesel 2.2 other publications american society for testing and materials (astm) d 257 standard test methods for d-c resistance or conductance of insulating materials d 412 standard test methods for rubber properties in tension d 2240 standard test methods for rubber property - durometer hardness d 2671 standard methods of testing heat-shrinkable tubing for electrical use g 21 standard 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, philadelphi a, pennsylvania 19103). 3. requirements 3.1 material the tubing shall be fabricated from a stabilized, flame resistant, modified elastomer and shall be radiation crosslinked. it shall be homogene ous and essentially free from flaws, defects, pinholes, bubbles, seams, cracks, and inclusions.
page 2 specification RT-1116 issue 5 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved 3.2 color the tubing shall be black. 3.3 properties the tubing shall meet all the requirements of table 3. 4. quality assurance provisions 4.1 classification of tests 4.1.1 qualification tests qualification tests are those pe rformed on tubing submitted for qualifi cation 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 subm itted for acceptance under contract. acceptance tests shall consist of the following: dimensions, longitudinal change, tensile strength, tensile stress, ultimate elongation, heat shock, ha rdness, flammability, and low temperature flexibility. 4.2 sampling instructions 4.2.1 qualification test samples qualification test samples shall consist of 50 feet (15 m) of tubing of each size. qualification of any size within each size range specified below w ill qualify all sizes in the same range. size ranges 3/8 through 3/4 1 through 3 4.2.2 acceptance test samples acceptance test samples shall c onsist 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, tests shall be performed on specimens which have been fully recovered by conditioning for 10 minutes in a 200 2c (392 4f) oven. prior to all testing, the test specimens (and measurement gauges, when applicable) shall be conditioned for 3 hours at 23 3c (73 5f) and 50 5 percent relative humidity. all ovens shall be of the mechanical convection type in which air passes over the specimens at a velocity of 100 to 200 feet (30 to 60 m) per minute. 4.3.1 dimensions and longitudinal change three 6-inch (150-mm) specimens of tubing, as supplied, shall be measured for length 1/32 inch ( 1 mm) and inside diameter in accordance with as tm d 2671, conditioned for 10 minutes in a 200 2c (392 4f) oven, cooled to 23 3f (73 5f) and then remeasured. prior to and after conditioning, the dimensions of the tubing shall be in accordance with ta ble 1 and the longitudinal change shall be in accordance with tabl e 3. longitudinal change shall be calculated as follows: c = l 1 - l 0 l 0 x 100 where: c = longitudinal change (percent) l 0 = length before conditioning [inches (mm) ] l 1 = length after conditioning [inches (mm) ]
specification RT-1116 issue 5 page 3 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved 4.3.2 tensile strength, tensile stress, and ultimate elongation three specimens of tubing shall be tested for tens ile strength, tensile stress, and ultimate elongation in accordance with astm d 2671. for tubing size 3/8, the speci mens shall be full sections of tubing. for sizes 1/2 and larger, the specimens shall be cut with die d of astm d 412. the specimens shall have 1-inch (25- mm) bench marks, centrally located. the testing machine shall have an initial jaw separation of 1 inch (25 mm) for full sections of tubing and 2 inches (50 mm) for die cut specimens. the rate of jaw separation shall be 20 2 inches (500 50 mm) per minute. 4.3.3 low temperature flexibility three specimens, each 12 inches (300 mm) in length, and a mandrel select ed in accordance with table 2, shall be conditioned at -55 3c (-67 5f) for 4 hours. for tubing sizes 3/4 or less, the specimens shall be whole sections of tubing recovered on a stranded wire (nearest awg which is larger than the sleeving maximum inside diameter after unrestricted shrinkage). for tubing sizes larger than 3/4, the specimens shall be 1/4-inch (6.3-mm) wide strips cut from tubing wh ich has been recovered in accordance with 4.3. after 4 hours conditioning, and while still at the conditioning te mperature, the specimens shall be wrapped around the mandrel for not less than 360 in 10 2 seconds. the specimens then shall be visually examined for evidence of cracking. 4.3.4 heat shock three 6-inch (150-mm) specimens of tubing shall be conditioned for 4 hours in a 225 3c (437 5f) oven. after conditioning, the specimens shall be removed from the oven, cooled to room temperature, and visually examined for evidence of dripping, flowing, or cracking. 4.3.5 heat resistance three specimens of tubing prepared and measured in accordance with 4.3.2, shall be conditioned for 168 hours in a 150 2c (302 4f) oven. 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 4.3.2. 4.3.6 copper stability three 6-inch (150-mm) specimens of tubing shall be slid over snug- fitting, straight , clean, bare copper mandrels, either solid or tubular. the specimens on the mandrels shall be conditioned for 24 hours in a desiccator or similar humidity chamber at 90 to 95 percent relative humidity and 23 3c (73 5f) . the specimens on the mandrels then shall be conditioned for 168 hours in a 1 50 2c (302 4f) oven. after conditioning, the specimens sh all be removed from the oven and cooled to 23 3c (73 5f) . the copper mandrels shall then be rem oved from the tubing and the tubing and copper mandrels shall be examined. darkening of the coppe r due to normal air oxidation shall not be cause for rejection. the tubing shall be tested fo r ultimate elongation in accordance with 4.3.2.
page 4 specification RT-1116 issue 5 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved 4.3.7 corrosive effect the tubing shall be tested for copper mirror corrosi on in accordance with astm d 2671, procedure a. the specimens shall be conditioned for 16 hours at 135 3c (275 5f) . 4.3.8 fluid resistance six specimens, three 6-inch (150-mm) tubing specimens, which shall be weighed prior to immersion, and three tensile specimens prepared a nd measured in accordance with 4.3.2, shall be immersed for 24 hours in each of the test fluids listed in table 3 at the temperat ure specified. the volume of the fluid shall not be less than 20 times that of the specimens. after conditioning, all the specimens shall be lightly wiped and air dried for 30 to 60 minutes at 23 3c (73 f) . the three specimens intended for the tensile strength and elongation tests shall then be tested in accordance with 4.3.2. the othe r three specimens shall be weighed before and after immersion and the wei ght change calculated as a percentage. 4.4 rejection and retest failure of any sample of tubing to comply with any one of the requirements of this specification shall be cause for rejection of the lot represented. tubing whic h has been rejected may be replaced or reworked to correct the defect and then submitte d for acceptance. before resubmitti ng, 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 form unless otherwise specified, the tubing shall be supplied on spools. 5.2 packaging packaging shall be in accordance w ith good commercial practice. the sh ipping container sh all be not less than 125 pound-test fiberboard. 5.3 marking each container of tubing shall be permanently and legibly marked with the size, quantity, manufacturer's identification, and lot number.
specification RT-1116 issue 5 page 5 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved table 1 tubing dimensions as supplied as recovered inside diameter inside diameter wall thickness size minimum maximum minimum maximum nominal in. mm. in. mm. in. mm. in. mm. in. mm. 3/8 .375 9.50 .187 4.75 .032 0.81 .048 1.21 .040 1.02 1/2 .500 12.70 .250 6.35 .040 1.02 .056 1.42 .048 1.21 3/4 .750 19.05 .375 9.50 .046 1.16 .068 1.72 .057 1.45 1 1.000 25.40 .500 12.70 .059 1.49 .081 2.05 .070 1.78 1-1/2 1.500 38.10 .750 19.05 .079 2.00 .111 2.81 .095 2.41 2 2.000 50.80 1.000 25.40 .094 2.38 .126 3.20 .110 2.79 3 3.000 76.20 1.500 38.10 .105 2.66 .145 3.68 .125 3.18 table 2 mandrel dimensions for bend testing mandrel diameter tubing size in. mm. 3/8 through 1/2 3/8 9.5 3/4 through 1-1/2 5/8 15.9 2 through 3 7/8 22.2
page 6 specification RT-1116 issue 5 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved table 3 requirements property unit requir ement test method physical dimensions inches (mm) in accordance with table 1 section 4.3.1 longitudinal change percent +1, -10 astm d 2671 tensile strength psi (mpa) 2000 minimum (13.8) tensile stress at 100 percent elongation psi (mpa) 1200 maximum (8.3) section 4.3.2 astm d 2671 ultimate elongation percent 300 minimum specific gravity --- 1.55 maximum astm d 2671 hardness shore a 80 10 astm d 2240 low temperature flexibility 4 hours at -55c (-67f) --- no cracking section 4.3.3 heat shock 4 hours at 225c (437f) no dripping, flowing, or cracking section 4.3.4 heat resistance 168 hours at 150c (302f) followed by tests for: --- --- section 4.3.5 tensile strength psi (mpa) 1500 minimum (10.3) section 4.3.2 ultimate elongation percent 300 minimum copper stability 168 hours at 150c (302f) followed by test for; no brittleness, glazing or cracking of tubing; no pitting or blackening of copper section 4.3.6 ultimate elongation percent 200 minimum section 4.3.2 electrical dielectric strength volts/mil (kv/mm) 300 minimum (11.8) astm d 2671 volume resistivity ohm-cm 10 9 minimum astm d 257
specification RT-1116 issue 5 page 7 if this document is printed it becomes un controlled. check for the latest revision. ? 2005-2012 tyco electronics corporation. all rights reserved table 3 requirements (continued) property unit requir ement test method chemical corrosive effect 16 hours at 135c (275f) --- noncorrosive section 4.3.7 astm d 2671 flammability average time of burning seconds 15 maximum astm d 2671 procedure a fungus resistance --- rating of 1 or less astm g 21 fluid resistance 24 hours at 23c (73f) jp-4 fuel (mil-dtl-5624) hydraulic fluid (mil-prf-5606) anti-icing fluid (sae-ams1424) lubricating oil (mil-prf-23699f ) cleaning compound (a-a-59133) water followed by tests for: --- --- section 4.3.8 tensile strength psi (mpa) 1500 minimum (10.3) section 4.3.2 ultimate elongation percent 300 minimum section 4.3.2 weight increase percent 15 maximum section 4.3.8 fluid resistance 24 hours at 50c (122f) df-2 (a-a-52557) jp-4 fuel (mil-dtl-5624) followed by tests for: --- --- tensile strength psi (mpa) 1500 minimum (10.3) section 4.3.2 ultimate elongation percent 300 minimum section 4.3.2 weight increase percent 20 maximum section 4.3.8 fluid resistance 24 hours at 71c (160f) hydraulic fluid (mil-prf-6083) hydraulic fluid (mil-prf-46170d ) followed by tests for: --- --- section 4.3.8 tensile strength psi (mpa) 1500 minimum (10.3) section 4.3.2 ultimate elongation percent 300 minimum section 4.3.2 weight increase percent 15 maximum section 4.3.8
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