Transcription of IPC-TM-650 TEST METHODS MANUAL - img52.chem17.com
1 The Institute for Interconnecting and Packaging Electronic Circuits Number 2215 Sanders Road Northbrook, IL 60062-6135 Subject Flexural Endurance, Flexible Printed Wiring Materials Date Revision 5/98 D. IPC-TM-650 originating Task Group Flex Peel Strength Test METHODS Task TEST METHODS MANUAL Group (D-13A). 1 Scope To determine the number of flexes to failure of etched flexible printed wiring circuit patterns. 2 Applicable Documents None IPC-243-1. 3 Test Specimen The test specimen shall consist of an etched conductor pattern in accordance with Figure 1.
2 A mini- Figure 1 Flexural Endurance Test Pattern. mum of six specimens with the long dimension of the conduc- (Note: Conductors are mm wide on mm centers.). tors oriented in the transverse direction of the material shall be (Part of IPC-A-31). prepared using standard commercial practices. Test three specimens per clad side with the conductor For double-sided clad constructions, a separate sample on the inside of the loop. The reciprocating travel should not specimen shall be prepared for each side. The opposite exceed 10 cycles per minute. The loop shall travel at least (untested) side shall be completely etched of copper.
3 Mm. The thickness designator in the specification refers to The number of cycles to failure is when discontinuity of the total thickness of dielectric, copper, and adhesive. the conductor occurs. 4 Apparatus Flexural Endurance Tester (see Figure 2) or Examine the conductor fracture for evidence of process equivalent. anomalies (such as pin holes and nicks), which could cause premature fracture. If such anomalies are found, the sample 5 Procedure shall be discarded and a new sample tested. Attach a short length of insulated wire to the extreme Report the average number of cycles to failure for the ends of the conductor pattern of each of the six specimens.
4 Three specimens tested per clad side. Using the flexure equipment, Figure 2, mount the speci- men so that the inside diameter of the loop is mm 6 Notes Prints of test fixture are available from the IPC. mm and connect the two wires to the relay. office. IPC-243-2. Figure 2 Flexural Endurance Fixture Material in this Test METHODS MANUAL was voluntarily established by Technical Committees of the IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this Page 1 of 1.
5 Material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement. Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.
