1、Lessons Learned Entry: 0430Lesson Info:a71 Lesson Number: 0430a71 Lesson Date: 1996-07-15a71 Submitting Organization: JPLa71 Submitted by: J.A. RobertsSubject: Permeability, Swelling and Solvent-Stress-Cracking Polymeric and Elastomeric Materials (1977) Abstract: During fabrication of the TIROS-N Mi
2、crowave Sounding Unit, connector cleaning fluids penetrated to the interior of the chassis. This caused severe swelling of the conformal coating material and the subsequent fracture of electronic components, dissolution of polyurethane insulation on the magnet hookup wire, and removal of component i
3、dentification markings. To preclude detrimental results, care should be exercised in the selection of fluids to be used with or in the presence of polymeric and elastomeric materials.Description of Driving Event: (Relevant Historical Lesson(s) Learned)During the fabrication of the Television Infrare
4、d Observation Satellite (TIROS-N) Microwave Sounding Unit, fluids used to clean chassis mounted connector penetrated around and through the connectors to the interior of the chassis causing severe swelling of the conformal coating material and the subsequent fracture of electronic components, dissol
5、ution of polyurethane insulation on magnet hookup wire and removal of component identification markings.Additional Keyword(s): Connector Cleaning, PolymersReference(s): PFR #2649Lesson(s) Learned: Most polymeric and elastomeric materials are permeable and are subject to swelling and solvent-Provided
6、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-stress-cracking when exposed to some fluids.Recommendation(s): To preclude detrimental results, care should be exercised in the selection of fluids to be used with or in the presence of polymeric and elastomeri
7、c materials.Evidence of Recurrence Control Effectiveness: N/ADocuments Related to Lesson: N/AMission Directorate(s): N/AAdditional Key Phrase(s): a71 Hardwarea71 Parts Materials & ProcessesAdditional Info: Approval Info: a71 Approval Date: 1996-04-11a71 Approval Name: Carol Dumaina71 Approval Organization: JPLa71 Approval Phone Number: 818-354-8242Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
